Students of class 11 Chemistry should refer to MCQ Questions Class 11 Chemistry Organic Chemistry – Some Basic Principles and Techniques with answers provided here which is an important chapter in Class 11 Chemistry NCERT textbook. These MCQ for Class 11 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 11 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 11 Chemistry examination

Chapter 12 Organic Chemistry – Some Basic Principles and Techniques MCQ with Answers Class 11 Chemistry

MCQ Questions Class 11 Chemistry Organic Chemistry – Some Basic Principles and Techniques provided below have been prepared by expert teachers of grade 11. These objective questions with solutions are expected to come in the upcoming Standard 11 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. Which of the following compounds represents 2,2,3 – trimethyl hexane?
(a) CH₃C (CH₃)₂ CH₂CH₂CH(CH₃)₂  
(b) CH₃C (CH₃)₂ CH₂CH(CH₃)₂ CH₂CH₃ 
(c) CH₃C (CH₃)₂ CH (CH₃)CH₂ CH₂CH₃
(d) CH₃C (CH₃)₂ CH₂C (CH)₂ CH₃               

Question. The structural formula of 2-oxo-3-methyl-(N-bromo) butanamide is
(a) CH₃ — CH₂ —CO —CO — NH — Br  
                 CH₃        
                  | 
(b) CH₃ — CH —CO —CO — NH — Br
                                     CH₃ 
                                        | 
(c) CH₃CH —CO —CO — NOBr
(d) (CH₃)₃ C —CO —CO — NHBr           

Question. On the basis of hybridisation and resonance effect, the correct order of bond length of the following is

(a) II> IV> III> I
(b) I> III> IV> II
(c) II> IV> I> III
(d) III> I> IV> II

Question. The maximum number of isomer for an alkene with the molecular formula C₄H₈ is
(a) two
(b) three
(c) four
(d) five           

Question. The IUPAC name of neopentane is 
(a) 2-methylbutane
(b) 2, 2- dimethylpropane
(c) 2-methylropane
(d) 2, 2-dimethylbutane               

Question. The correct stability order for the following species is

(a) (II) > (IV) > (I) > (III)
(b) (I) > (II) > (III) > (IV)
(c) (II) > (I) > (IV) > (III)
(d) (I) > (III) > (II) > (IV)

Question. In which of the following functional group isomerism is not possible?
(a) Alcohols
(b) Aldehydes
(c) Alkyl halides
(d) Cyanides         

Question. Identify the compound that exhibits tautomerism
(a) 2-butene
(b) lactic acid
(c) 2-pentanone
(d) ethane       

Question.

Consider the above written reaction. The product is

Question. Which of the following compounds will show metamerism?
(a) CH₃COOC₂H₅
(b) C₂H₅ —S—C₂H₅ 
(c) C₂H₅ —O—C₂H₅ 
(d) CH₃ —O—C₂H₅                   

Question. The correct order of increasing basicity of the given conjugate bases (R = CH₃ ) is 
(a) RCOO  <HC =C < R NH₂
(b) R < HC =C < RCOO <NH₂
(c) RCOO <NH₂ < HC =C <R  
(d) RCOO <HC =C <NH₂ <R       

Question. The IUPAC name of the compound shown below is

(a) 2-bromo-6-chlorocyclohex-1-ene
(b) 6-bromo-2-chlorocyclohexene
(c) 3-bromo-1-chlorocyclohexene
(d) 1-bromo-3-chlorocyclohexene

Question. The distillation technique most suited for separating glycerol from spent lye in the soap industry is
(a) fractional distillation
(b) steam distillation
(c) distillation under reduced pressure
(d) simple distillation     

Question. For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl’s method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 mL of M/10 sodium hydroxide for complete neutralisation. The precentage of nitrogen in the compound is 
(a) 6%
(b) 10%
(c) 3%
(d) 5%       

Question. Which one of the following is most stable?

Question. The correct order of nucleophilicity is
(a) I⁻ > Br⁻ > Cl⁻> F⁻
(b) Cl⁻> F⁻ > Br⁻ > I⁻
(c) F⁻ > Cl⁻ > Br⁻ > I⁻
(d) I⁻ > Cl⁻ > Br⁻ > F⁻         

Question. The order of stability of the following carbocations

(a) III > II > I
(b) II > III > I
(c) I > II > III
(d) III > I > II

Question. Nitroethane can exhibit one of the following kind isomerism.
(a) Metamerism
(b) Optical activity
(c) Tautomerism
(d) Position isomerism       

Question. Identify the compound that exhibits tautomerism.
(a) 2-butene
(b) lactic acid
(c) 2-pentanone
(d) Phenol     

Question. The maximum number of possible optical isomers in 1-bromo-2-methyl cyclobutane is
(a) 4
(b) 2
(c) 8
(d) 16     

Question. Which one of the following is the most energetic conformation of cyclohexane? 
(a) Boat
(b) Twisted boat
(c) Chair
(d) Half chair     

Question. Which of the following is the correct order of priority of groups in D -glyceraldehyde? 
(a) OH (1), CHO (2), CH₂OH (3) and H (4)
(b) OH (1), CH₂OH (2), CHO (3) and H (4)
(c) CH₂OH (1), CHO (2), OH (3) and H (4)
(d) CHO (1), OH (2), CH₂OH (3) and H (4)       

Question. The structures (CH₃)₃ CBr and CH₃ (CH₂)₃Br represent
(a) chain isomerism 
(b) position isomerism
(c) chain as well as position isomerism
(d) functional isomerism     

Question. Which of the following compounds exhibit rotamers?
(a) 2-butene
(b) Maleic acid 
(c) Butane
(d) Fumeric acid     

Question. The total number of cyclic isomers possible for a hydrocarbon with the molecular formula C₄H₆ is
(a) 1
(b) 3 
(c) 5
(d) 7         

Question. Which among the following statements is correct with respect to the optical isomers? 
(a) Enantiomers are non-superimposable mirror images
(b) Diastereomers are superimposable min-or images
(c) Enantiomers are superimposable mirror image
(d) Meso-fonns have no plane of symmetry       

Question. The total number of cyclic structural as well as stereoisomers possible for a compound with the molecular formula C₅H₁₀ is 
(a) 2
(b) 4
(c) 6
(d) 7     

Question. Which of the following compounds will show metamerism? 
(a) CH₃ —CO—C₂H₅
(b) C₂H₅—S—C₂H₅
(c) CH₃ —O—CH₃
(d) CH₃—O—C₂H₅     

Question. The alkene that exhibits geometrical isomerism is
(a) propene 
(b) 2-methyl propene
(c) 2-butene
(d) 2-methyl-2-butene   

Question. Racemic compound has 
(a) equimolar mixture ofenantiomers
(b) 1 : 1 mixture of enantiomer and diastereomer
(c) 1 : 1 mixture of diastereomers
(d) 1 : 2 mixture of enantiomers       

Question. Out of the following, the aikene that exhibits optical isomerism is 
(a) 3-methyl-2-pentene
(b) 4-methyl-1-pentene
(c) 3-methyl-1-pentene
(d) 2-methyl-2-pentene     

Question. Angle strain in cyclopropane is
(a) 24°44′
(b) 9°44′
(c) 44′
(d) – 5° 16′     

Question. Which of the following does not contain chiral carbon atom? 
(a) Lactic acid
(b) 2-chlorobutanoic acid
(c) Tartaric acid 
(d) Succinic acid     

Question. A molecule having three different chiral carbon atoms, how many stereoisomers it will have? 
(a) 8
(b) 3
(c) 9
(d) 6     

Question. Example of geometrical isomerism is
(a) 2-butanol
(b) 2-butene
(c) butanal
(d) 2-butyne   

Question. The total number(s) of stable conformers with non-zero dipole moment for the following compound is/are

(a) 3
(b) 2
(c) 4
(d) 5

Question. The number of isomeric pentyl alcohols possible is
(a) two
(b) four
(c) six
(d) eight     

Question. The number of stereoisomers possible for a compound of the molecular fommla
CH₃ —CH= CH—CH(OH)—Me is 
(a) 3
(b) 2
(c) 4
(d) 6     

Question. The increasing order of stability of the following free radicals is

Question. The number of isomeric alkanes having the molecular fommla C₅H₁₂ is 
(a) three
(b) five
(c) nine
(d) thirty two        

Question. The most stable free radical is
(a) PhCH₂CH₂
(b) MeCH₂ 
(c) Me₂CH  
(d) PhCHMe           

Question. Which among the following free radical is most stable?

Question. The number of stereoisomers possible for a compound of the molecular formula
     CH₃ — CH == CH — CH(OH) Me is
(a) 3
(b) 2
(c) 4
(d) 6         

Question. Correct order of nucleophilicity is
(a) CH₃⁻ < NH₂⁻ < OH⁻ < F⁻
(b) F⁻ < OH⁻ < CH₃⁻  < NH₂⁻
(c) OH⁻ < NH₂⁻< F⁻ < CH₃⁻ 
(d) F⁻ < OH⁻ < NH₂⁻ < CH₃⁻           

Question. Which is the most stable carbocation?

Question. How many chiral compounds are possible on monochlorination of 2-methylbutane? 
(a) 8
(b) 2
(c) 4
(d) 6       

Question. The most suitable method for separation of1:1mixture of ortho and para-nitrophenols is
(a) sublimation
(b) chromatography
(c) crystallisation
(d) steam distillation                 

Question. The most stable carbanion is

Question. Two solids A and B have appreciably different solubilities in water but their melting points are very close. The mixture of A and B can be separated by
(a) sublimation
(b) fractional crystallisation
(c) distillation
(d) Both (b) and (c)       

Question. Arrange the carbanions, in order of their decreasing stability.

Question. 29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl’s method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralisation. The percentage of nitrogen in the compound is
(a) 59.0
(b) 47.4
(c) 23.7
(d) 29.5           

Question. 3-methylpent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is
(a) six
(b) zero
(c) two
(d) four           

Question. Among the following, the least stable resonance structure is

Question. Which of the following compound will exhibi geometrical isomerism?
(a) 1- phenyl-2-butene
(b) 3 – phenyl-1-butene
(c) 2 – phenyl-1-butene
(d) 11 , – diphenyl-1-propane         

Question. In the following carbocation, H/CH3 that is most likely to migrate to the positively charged carbon is

(a) CH₃ at C-4
(b) H at C-4
(c) CH₃ at C-2
(d) H at C-2

Question. The Lassaigne’s extract is boiled with dil. HNO₃ before testing for halogens because
(a) Ag₂S is insoluble in HNO₃
(b) AgCN is soluble in HNO₃
(c) Na₂S and NaCN are decomposed by HNO₃
(d) silver halides are soluble in HNO₃       

Question. In Carius method of estimation of halogens 250 mg of an organic compound gave 141mg of AgBr.The percentage of bromine in the compound is (at. mass Ag = 108,Br = 80) 
(a) 24
(b) 36
(c) 48
(d) 60       

Question. Which of the following molecules is least resonance stabilised?

Question. A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is 
(a) C₂H₄
(b) C₃H₄
(c) C₆H₅
(d) C₇H₈           

Question. The order of the stability of the following carbocations

(a) III > II > I
(b) I > III > II
(c) I > II > III
(d) III > I > II

Question. The compound that does not give a blue colour in Lassaigne’s test is
(a) aniline
(b) glycine
(c) hydrazine
(d) urea         

Question. Which of the following compounds will be suitable for Kjeldahl’s method for nitrogen estimation?

Question. 60 g of organic compound on analysis gave following results C = 24 g; H = 4 g andO = 32 g.
The compound can be
(a) CH₂O₂
(b) C₂H₂O
(c) C₂H₂O₄
(d) CH₂O           

                                                                                                                                         1    2
Question. The bond between carbon atom (1) and carbon atom (2) in compound N = C —CH == CH₂  involves respectively the hybrid orbitals
(a) sp² and sp²
(b) sp³ and sp
(c) sp and sp²
(d) sp and sp             

Question. Order of reactivity for the following compounds, is

(a) IV < II < III < I
(b) II < IV < III < I
(c) IV < II < I < III
(d) II < IV < I < III

Question. The name of ClH₂C — C ==C — CH₂Cl according to
                                    Ι      Ι
                                    Br    Br
IUPAC nomenclature system is
(a) dichloro dibromobutene
(b) dichloro dibromobutane
(c) 1,4- dichloro- 2,3- dibromobut- 2- ene
(d) 2,3- dibromo -1,4- dichlorobut- 2- ene       

Question. Which one of the following compounds is most acidic?

Question. Which of the following statement is wrong?
(a) Using Lassaigne’s test nitrogen or sulphur present in an organic compound can be tested
(b) Using Beilstein’s test the presence of halogen in a compound can be tested
(c) Lassaigne’s test fails to identify nitrogen in diazo compound
(d) In the estimation of carbon an organic compound is heated with CuO in a combustion tube     

Question. Arrange the following free radicals in order of decreasing stability.
Methyl (I), Vinyl (II), Allyl (III), Benzyl (IV)
Codes
(a) I > II > III > IV
(b) III > II > I > IV
(c) II > I > IV > III
(d) IV > III > I > II       

Question. Which of the following order is true regarding the acidic nature of COOH ?
(a) Formic acid > acetic acid > propanoic acid
(b) Formic acid > acetic acid < propanoic acid
(c) Formic acid < acetic acid > propanoic acid
(d) Formic acid < acetic acid < propanoic acid         

Question. Among the following, the least stable resonance structure is

Question. Which of the following orders is not correct regarding −I -effect of the substitutents?
(a) —I< —Cl< —Br< —F
(b) —N⁺R₃ < —O⁺R₂
(c) —N⁺R₂ < —OR < —F
(d) —SR < — OR < —O⁺R₂           

Question. Out of the following the alkene that exhibits optical isomerism is
(a) 3-methyl-2-pentene
(b) 4-methyl-1-pentene
(c) 3-methyl-1-pentene
(d) 2-methyl-2-pentene         

Question.  The rate of the reaction,

The increasing order of speed of the above reaction is
(a) IV< IIl< II < I
(c) I <IV< IIl <II
(b) I <II <III< IV
(d) III < II < I < IV

Question. Consider the following carbocations.
I. C₆H₅ C⁺H₂+
II. C₆H₅CH₂ C⁺H₂
III. C₆H₅ C⁺H CH₃
IV. C₆H₅ C⁺ (CH₃)₂
The correct sequence of the stability of these carbocation is
(a) II<I<III<IV
(b) II<III<I< IV
(c) III<I<II<IV
(d) IV<III<I<II         

Question. In Kjeldahl’s method, the gas evolved from 1.325 g sample of fertiliser is passed into 50.0 mL of 0.2030 N H2SO4. 25.32 mL of 0.1980 N NaOH are required for the titration of unused acid. What will be the percentage of nitrogen in fertiliser?
(a) 2.50 %
(b) 5.43 %
(c) 6.48 %
(d) 12.02 %             

Question. The electrophile Ee attacks which benzene ring to generate the intem1ediate cr-complex. Which of the following cr-complexes is of lowest energy?

Question. Electronegativity of carbon atoms depend upon their state of hybridisation. In which of the following compounds, the carbon marked with asterisk is most electronegative?
(a) CH₂ —CH₂ —*CH₂ —CH₃
(b) CH₃ —*CH = CH—CH₂
(c) CH₃ —CH₂ —C = *CH 
(d) CH₃ —CH₂ —CH = *CH₂       

Question. Which of the following compounds contain only primary hydrogen atoms?
(a) Isobutene
(b) 2, 3 – dimethylbut – 2 – ene
(c) Cyclohexane
(d) Propyne         

We hope the above multiple choice questions for Class 11 Chemistry for Chapter 12 Organic Chemistry – Some Basic Principles and Techniques provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Organic Chemistry – Some Basic Principles and Techniques is an important chapter in Class 11 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for the benefits of class 11 students. Please go through these and let us know if you have any feedback in the comments section.