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

Please refer to Organic Chemistry – Some Basic Principles and Techniques MCQ Questions Class 11 Chemistry below. These MCQ questions for Class 11 Chemistry with answers have been designed as per the latest NCERT, CBSE books, and syllabus issued for the current academic year. These objective questions for Organic Chemistry – Some Basic Principles and Techniques will help you to prepare for the exams and get more marks.

Organic Chemistry – Some Basic Principles and Techniques MCQ Questions Class 11 Chemistry

Please see solved MCQ Questions for Organic Chemistry – Some Basic Principles and Techniques in Class 11 Chemistry. All questions and answers have been prepared by expert faculty of standard 11 based on the latest examination guidelines.

MCQ Questions Class 11 Chemistry Organic Chemistry – Some Basic Principles and Techniques

Question. The compound which contains all the four 1°, 2° ,3° and4° carbon atoms is 
(a) 2, 3-dimethylpentane
(b) 3-chloro-2, 3- dimethylpentane
(c) 2, 3, 4-trimethylpentane
(d) 3, 3-dimethylpentane     

Question. The correct IUP AC name of

is
(a) 1-cyclopropyl cyclobutane
(b) l, 1-dicyclobutane
(c) l-cyclobutane-1-cyclopropane
(d) None of the above

Question. Which one of the following is not true regarding electromeric effect? 
(a) It is temporary effect
(b) It operates on multiple bonds
(c) It requires on attacking reagent
(d) It results in the appearance of partial charges on the carbon atom     

Question. Electromeric effect is
(a) permanent effect
(b) temporary effect
(c) resonance effect
(d) inductive effect     

Question. What is the correct IUPAC name of

(a) 4-methox y-2-ni trobenzaldehyde
(b) 4-fonnyl-3-nitro anisole
(c) 4-methoxy-6-nitrobenzaldehyde
(d) 2-fonnyl-5-methoxy nitrobenzene

Question. Among the following compounds, the most acidic is
(a) p-nitrophenol
(b) p-hydroxybenzoic acid
(c) o-hydroxybenzoic acid
(d) p-toluic acid     

Question. The IUPAC aame of

is

(a) 1-cyclohexa-2, 4-dienylethanone
(b) 3-cyclohexa-2, 4-dienylethanone
(c) 1 -cyclohexa-3, 5-dienylethanone
(d) 3-cyclohexa-3, 5-dienylethanone

Question. The IUPAC name of the compound (CH₃ )₂ CH—CH=CH—CHOH—CH₃ is 
(a) 5-methylhex-3-en-2-ol
(b) 2-methylhex-3-en-5-ol
(c) 2-hydroxy-5-methyl-3-hexene
(d) 5-hydroxy-2-methyl-3-hexene      

Question. IUPAC name of CH₃CH₂C(Br) = CH—Cl is
(a) 2-bromo-1-chloro butene-1 
(b) 1-chloro-2-bromo butene-1
(c) 3-chloro-2-bromo butene-2
(d) None of the above           

Question. The IUPAC name of CH₃—C—CH—CH₃ is
                                           ll     l
                                           O   CH₃
(a) 2-methyl-3-butanone
(b) 3-methyl-butan-2-one
(c) 3-methyl butanone
(d) None of the above       

Question. The IUPAC name of the compound CH₃CONHBr is
(a) 1-bromoacetamide 
(b) ethanoylbromide
(c) N-bromoethanamide
(d) None of the above       

Question. n-pentane and 2-methylbutane is a pair of
(a) enantiomers
(b) stereo isomers
(c) diastereomers
(d) constitutional isomers       

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

Question. Number ofisomers possible for C₄H₈O is 
(a) 3
(b) 4
(c) 5
(d) 6   

Question. What kind of isomerism is possible for 1-chloro-2-nitroethene?
(a) Functional group isomerism
(b) Position isomerism
(c) EIZ isomerism
(d) Optical isomerism   

Question. Which of the following will be chiral ? 
(a) CH₃CHCl₂
(b) CH₃CHBrCl
(c) CD₂Cl₂
(d) CH₂ClBr       

Question. Which of the following shows geometrical isomerism ?
(a) C₂H₅Br
(b) (CH₂) (COOH)₂
(c) (CH)₂ (COOH)₂
(d) C₂H₆       

Question(a) 1, 1-dichloro-1-pentene 
(b) 1, 2-dichloro-1-pentene
(c) 1, 3-dichloro-2-pentene
(d) 1, 4-dichloro-2-pentene   

Question. Racemic mixture is fonned by mixing two
(a) isomeric compounds
(b) chiral compounds
(c) meso compounds
(d) enantiomers with chiral carbon     

Question. Eno! content is highest in 
(a) acetone
(b) acetophenone
(c) acetic acid
(d) acetyl acetone     

Question. Which of the following is a pair offunctionaI isomers?
(a) CH₃COCH₃, CH₃CHO 
(b) C₂H₅CO₂H,CH₃CO₂CH₃
(c) C₂H₅CO₂H, CH₃CO₂C₂H₅
(d) CH₃CO₂H, CH₃CHO     

Question. The epoxide ring consists of which of the following?
(a) Three membered ring with two carbon and one oxygen
(b) Four membered ring with three carbon and one oxygen
(c) Five membered ring with four carbon and one oxygen
(d) Six membered ring with five carbon and one oxygen     

Question. IUPAC name of the following compounds is 
                O                    O       
                 ll                    ll
H₃C—CH₂—C—H₂C—CH₂—C—OCH₃
(a) ethyl-4-oxoheptanoate
(b) methyl-4-oxoheptanoate
(c) ethyl-4-oxohexanoate
(d) methyl 4-oxohexanoate         

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) RCO < NH₂ < HC=C < R
(d) RCOO< HC=C< NH₂ < R       

Question. Inductive effect involves 
(a) delocalisation of σ-electrons
(b) displacement of σ-electrons
(c) delocalisation of n-electrons
(d) displacement of n-electrons       

Question. The IUPAC name of C₆H₅COCl is
(a) benzoyl chloride
(b) benzene chloro ketone
(c) benzene carbonyl chloride
(d) chloro phenyl ketone     

Question. What is the formula of tertiary butyl alcohol? 
(a) CH₃—CH(CH₃ )—CH₂—OH
(b) CH₃—(CH₂ )₂ OH
(c) CH₃—CH(OH)—CH₂—CH₃
(d) (CH₃)₃ ·C—OH     

Question. The IUPAC name of CH₃CHOHCH₂CH(CH₃)CHO is
(a) 2-hydroxy-4-methyl-pentanal 
(b) 4-hydroxy-2-methyl-pentanal
(c) 2-hydroxy-2-methyl-pentanal
(d) 2-methyl-pent-4-ol-l-al      

Question. The IUPAC name of CH₃—CH—CH= C—CHO is
                                            l              l
                                          OH         CH₃
(a) 4-hydroxy-1-methylpentanal 
(b) 4-hydroxy-2-methylpent-2-en-1-al
(c) 2-hydroxy-4-methylpent-3-en-5-al
(d) 2-hydroxy-3-methy lpent-2-en-5-al      

Question. The IUP AC name of acryldehyde is 
(a) prop-2-en-1-al
(b) propenyl aldehyde
(c) but-2-en-1-al
(d) propenal     

Question. Write the IUPAC name of 
        CH₃—O—CH—CH₂—CH₃
                      l
                     CH₃
(a) 3-methoxybutane
(b) 2-methoxybutane 
(c) 3-methyl-3-methoxypropane
(d) butoxy methane       

Question. IUPAC name of CH₃CH= C—CH₃ is
                                        I
                                       CH₂
                                        I 
                                       CH₃  
(a) 2-ethyl butene
(b) 2-ethyl but-2-ene
(c) 3-methyl pent-2-ene 
(d) None of these     

Question. Formic acid is a stronger acid than acetic acid. This can be explained using 
(a) + M-effect
(b) – I-effect
(c) + I-effect
(d) – M-effect     

Question. Geometrical isomerism is reflected by which of the compounds?
(a) 3-phenyl- 1-butene
(b) 2-phenyl- 1 -butene
(c) 1, 1-diphenyl-1-propene
(d) 1-phenyl-2-butene   

Question. The number of possible structural isomers of butene are
(a) 3
(b) 2
(c) 4 
(d) 5
(e) 1     

Question. Disymmetric object is one which is 
(a) superirnposable on its mirror image
(b) non-superimposable on its mirror image
(c) optically inactive
(d) achiral       

Question. The stability of Me₂C= CH₂ is more than that of Me CH₂CH=CH₂ due to the 
(a) inductive effect of Me groups
(b) resonance effect of Me groups
(c) hyperconjugative effect of the Me group
(d) resonance as well as inductive effect of Me group     

Question. Which of the following species does not exert a resonance effect? 
(a) C₆H₅NH₂
(b) C₆H₅N⁺H3
(c) C₆H₅OH
(d) C₆H₅Cl       

Question. Dichloroacetic acid is a stronger acid than acetic acid. This is due to the occurrence of 
(a) mesometic effect
(b) hyperconjugation
(c) inductive effect
(d) steric effect     

Question. The IUP AC 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. CH₃CH₂Cl undergoes homolytic fission, produces .
            •           •
(a) CH₃CH₂ and Cl
            ⊕
(b) CH₃CH₂ and Cl
           ⊕           •
(c) CH₃CH₂ and Cl
            •           
(b) CH₃CH₂ and Cl       

Question. The reaction intermediate produced by homolytic cleavage of a bond is called 
(a) carbene
(b) carbocation
(c) carbanion
(d) free radical         

Question. Which kind of fission is favoured by sunlight?
(a) Heterolytic fission
(b) Homolytic fission
(c) Both (a) and (b)
(d) None of these       

Question. IUPAC name of the following compound is

(a) 3, 5-dimethylcyclohexene
(b) 3, 5-dimethyl-1-cyclohexene
(c) 1, 5-dimethyl-5-cyclohexene
(d) 1, 3-dimethyl-5-cyclohexene

Question.

(a) 3, 3-dimethyl-1-hydroxy cyclohexane
(b) 1, 1 -dimethyl-3-hydroxy cyclohexane
(c) 3, 3-dimethy-1-cyclohexanol
(d) 1, 1-dimethyl-3-cyclohexanol

Question. The correct order for homolytic bond dissociation energies (ΔH in kcal/mol) for CH₄ (A),C₂H₆ (B) and CH₃Br (C), under identical experimental conditions, is 
(a) C > B > A
(b) B > C > A
(c) C > A > B
(d) A > B > C       

Question. Which of the following is possessed by a nucleophile?
(a) A lone pair of electron 
(b) Positive charge
(c) Negative charge
(d) None of the above       

Question. IUP AC name of the compound

(a) 5-methyl-4-isopropyl-6, 6′-diethyloctane
(b) 3, 3-dimethyl-3-ethyl-5-isopropyloctane
(c) 3, 3-diethyl-4-methyl-5-(1, I-dimethyl) octane
(d) 3, 3-diethyl-4-methyl-5-(1′-methyl ethyl) octane

Question. Which of the following has most acidic hydrogen?
(a) 3-hexanone 
(b) 2, 4-hexanedione
(c) 2, 4-hexanedione
(d) 2, 3-hexanedione       

Question. Orbital interaction between the σ-bonds of a substituent group and a neighbouring n-orbital is known as 
(a) hyperconjugation
(b) inductive effect
(c) steric effect
(d) electric quadrapole interaction     

Question. Bicyclo (1, I, 0) butane is

Question. Which of the following resonating structures of 1-methoxy-1, 3-butadiene is least stable?
        Θ                            ⊕
(a) CH₂ — CH=CH — CH=O—CH₃ 
(b) CH₂=CH₂ – CH — CH=O—CH₃
      Θ        ⊕
(c) CH₂ — CH—CH=CH—O—CH₃ 
                     Θ     ⊕
(d) CH₂=CH—CH—CH—O—CH₃       

Question. Amongst the following, the compound that can most readily get sulphonated is 
(a) benzene
(b) toluene
(c) nitrobenzene
(d) chlorobenzene     

Question. The systematic (IUPAC) name of the compound with the following structural formula will be

Question. +I-effect is shown by 
(a) — CH₃
(b) — Br
(c) — Cl
(d) — NO₂     

Question. Chlorobenzene is o, p -directing in electrophilic substitution reaction. The directing influence is explained by 
(a) + M of Ph
(b) + I of Cl
(c) + M of Cl
(d) – I of Ph       

Question. The basicity of aniline is less than that of cyclohexylamine. This is due to 
(a) +R effect of — NH₂ group
(b) – I effect of — NH₂ group
(c) -R effect of — NH₂ group
(d) hyperconjugation effect       

Question. A solution of (- d) 1-chloro-1-phenylelnane in toluene a racemises slowly in the presence of a small amounts of SbCI₅ due to the formation of
(a) carbanion
(b) carbene
(c) carbocation
(d) free radical     

Question. Which of the following compounds has incorrect IUPAC nomenclature?

Question. PhCHCIBr →^{t BuO-} carbene.
In the reaction, which of the following is most probable?
(a) : CHBr
(b) : CHCl 
(c) : CPhBr
(d) : CPhCl       

Question. Among the following carbocations
      +                              +
Ph₂CCH₂Me (I), PhCH₂CH₂CHPh (II), 
     +                                      +
Ph₂CCH₂Me (III) and Ph₂C(Me )CH₂  (IV), the order of stability is 
(a) IV > II > I > III
(b) I > II > III > IV
(c) II > I > IV > III
(d) I > IV > III > II     

Question. The total number of contributing structures showing hyperconjugation (involving C-H bonds) for the following carbocation is

(a) three
(b) five
(c) eight
(d) six

Question. The highest electrical conductivity of the following aqueous solutions is of 
(a) 0.1 M difluoroacetic acid
(b) 0.1 M fluoroacetic acid
(c) 0.1 M chloroacetic acid
(d) 0.1 M acetic acid       

Question. Which compound shows geometrical isomerism among the following? 
(a) CH3—C—H
              ll
     CH₃—C—H
             CH₃
             l
(b) HO—C—H
             l
           COOH
(c) CH₃CH₂ — CH₂CH₃
(b) CH₃CH₂COOC₂CH₅     

Question. Amongst the following, the total number of compounds soluble in aqueous NaOH is

(a) 1
(b) 2
(c) 3
(d) 4

Question. The well known compounds (+)-lactic acid and (—) -lactic acid, have the same molecular formula, C₃H₆O₃. The correct relationship between them is 
(a) constitution isomerism
(b) geometrical isomerism
(c) identicalness
(d) optical isomerism     

Question. The compound which gives the most stable carboniwn ionon dehydration is
(a) CH₃CH(CH₃ )CH₂OH
(b) (CH₃ )₃ COH
(c) CH₂ = CHCH₂CH₂OH
(d) CH₃CHOHCH₂ — CH₃     

Question. The correct acidity order of the following is

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

Question. Due to the presence of an unpaired electron, free radicals are 
(a) cations
(b) anions
(c) chemically inactive
(d) chemically reactive     

Question. Consider the following carbocations,
I. H₆CH₅C⁺H₂
II. C₆H₅CH₂C⁺H₂
III. C₆H₅C⁺HCH₃
IV. C₆H₅C⁺(H₃)₂
The cotTect sequence of the stability of these is
(a) II < I < III < IV 
(b) II < III < I < IV
(c) III < l < II < IV
(d) IV < III < I < II       

Question. Given,

The decreasing order of the acidic character is
(a) A>B>C
(b) B>A>C
(c) B> C> A
(d) C> B> A

Question. Which one of the nitrogen atoms in
          O
          II
H₂N—NH—C—NH₂ is the most nucleophilic?
    I    II          III
(a) Only III
(b) Only I 
(c) Only II
(d) All three N-atoms       

Question. Which of the following is not true for carbanions?
(a) The carbon carrying the charge has eight valence electrons 
(b) They are formed by heterolytic fission
(c) They are paramagnetic
(d) The carbon carrying the charge is sp³-hybridised     

Question. Which one of the following carbanions is the least stable?
(a) CH₃CH^–₂
(b) HC = C^– 
(c) (C₆H₅ )₃ c^–
(d) CH-₃
(e) (CH₃ )₃ C^–       

Question. Which is the most stable carbocation?
(a) iso-propy1 cation
(b) Triphenylmethyl cation
(c) Ethyl cation
(d) n-propyl cation   

Question. The correct stability order for the following species as

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

Question. The compound without a chiral carbon atom is 
                CH₃                  
                 l                      
(a) Br CH₂ CHCH₂Br
                    CH₃
                      l       
(b) C₂H₅CH₂ CHCH₂ Br
(c) CH³CH₂ CHCH₂Br
                  l
                 CH₃ 
(d) HOOC CH (Br) COOH
                l 
               CH₃   
(e) OHC—CH(OH)—CH₂OH       

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

Question. Total number C₄H₁₀O is of isomers for the molecular formula
(a) 3
(b) 4
(c) 6
(d)7