Please refer to the MCQ Questions for Class 11 Chemistry Chapter 12 Organic Chemistry – Some Basic Principles and Techniques with Answers. The following Organic Chemistry – Some Basic Principles and Techniques Class 11 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 11. Our experts have designed MCQ Questions for Class 11 Chemistry with Answers for all chapters in your NCERT Class 11 Chemistry book.
Organic Chemistry – Some Basic Principles and Techniques Class 11 MCQ Questions with Answers
See below Organic Chemistry – Some Basic Principles and Techniques Class 11 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below.
Question. Heterolytic fission of a covalent bond in organic molecules gives
(a) free radicals
(b) cations and anions
(c) only cations
(d) only anions
Answer
B
Question. The homolytic fission of a covalent bond liberates
(a) Carbonium ions
(b) Carbanions
(c) Free radicals
(d) Carbenes
Answer
C
Question. The compound without a chiral carbon atom is
Answer
A
Question. Homolytic fission of C–C bond in ethane gives an intermediate in which carbon is
(a) sp3-hybridised
(b) sp2-hybridised
(c) sp-hybridised
(d) sp2d-hybridised
Answer
B
Question. On exciting, Cl2 molecules by UV light, we get
(a) Cl•
(b) Cl+
(c) Cl–
(d) all of these
Answer
A
Question. Which of the given statement(s) aboutN, 0 , P and Q with respect to M is/are correct?
(a) Mand N are non-mirror image stereoisomerism
(b) Mand O are identical
( c) M and P are enantiomers
( d) Mand Q are identical
Answer
A,C
Question. The increasing order of stability of the following free radicals is
(a) (C6H5)2 H C • < (C6H5)3 •C < (CH3)3 •C < (CH3)2 H C •
(b) (CH3)2 H C • < (CH3)3 •C < (C6H5)2 •C H < (C6H5)3 •C
(c) (CH3)2 H C • < (CH3)3 •C < (C6H5)2 H C • < (C6H5)3 •C
( d) ( C6H5)3 •C < (C6H5)2 H C • < (CH3)3 •C < (CH3)2 H C •
Answer
B
Question. The structure of cis-bis (propenyl) ethene is
Answer
B
Question. Which of the following orders regarding relative stability of free radicals is correct?
(a) 3° < 2° < 1°
(b) 3° > 2° > 1°
(c) 1° < 2° > 3°
(d) 3° > 2° < 1°
Question. For the reaction of phenol with CHCl3 in presence of KOH, the electrophile is
(a) +CHCl2
(b) : CCl2
(c) CHCl2
(d) •CCl4
Answer
B
Question. Which compound shows geometrical isomerism among the following?
Answer
A
Question. Geometry of methyl free-radical is
(a) pyramidal
(b) planar
(c) tetrahedral
(d) linear
Answer
B
Question. Which of the following is a chiral molecule?
Answer
B
Question. In which of the following homolytic bond fission takes place ?
(a) Alkaline hydrolysis of ethyl chloride
(b) Addition of HBr to double bond
(c) Photochlorination of methane
(d) Nitration of benzene
Answer
C
Question. Consider thiol anion (RSΘ ) and alkoxy anion (ROΘ ) .Which of the following statements is correct?
(a) RSΘ is less basic and less nucleophilic than ROΘ
(b) RSΘ is less basic but more nucleophilic than ROΘ
(c) RSΘ is less basic and more nucleophilic than ROΘ
(d) RSΘ is more basic but less nucleophilic than ROΘ
Answer
B
Question. Products of the reaction are
(a) meso-compounds
(b) racemic mixtures
(c) mixtures of racemic and meso-compounds
(d) None of the above
Answer
B
Question. Most stable carbonium ion is
+
(a) C2H5
+
(b) (CH3 )3C
+
(c) (C6H5)3C
+
(d) C6H5CH2
Answer
B
Question. Amongst the given options, the compound (s) in which all the atoms are in one plane in all the possible confom1ations (if any), is (are)
Answer
B,C
Question. The correct combination of names for isomeric alcohols with molecular formula C4H10O is/are
(a) t-butanol and 2-methyl propan -2-ol
(b) t-butanol and 1, 1 dimethylethan-1-ol
(c) n-butanol and butan-1-ol
(d) iso-butylalcohol and 2-methylpropan-1-ol
Answer
A,C,D
Question. Which of the following isomerism is shown by ethyl acetoacetate ?
(a) Geometrical isomerism
(b) Keto-enol tautomerism
(c) Enantiomerism
(d) Diastereoisomerism
Answer
B
Question The maximum number of isomers (including stereoisomers) that are possible on monochlorination of the following coumpound, is
(a) 2
(b) 4
(c) 6
(d) 8
Answer
C
Question. How many enols (including stereo isomers) exist for 3-hexanone ?
(a) Two
(b) Three
(c) Four
(d) Six
Answer
C
Question. Which one of the following will show optical isomerism?
Answer
B
Question. Geometry of methyl free radical is
(a) pyramidal
(b) planar
(c) tetrahedral
(d) linear
Answer
B
Question. Relative stabilities of the following carbocations will be in the order
⊕ ⊕ ⊕
CH3 CH3CH2 CH2OCH3
A B C
(a) C > B > A
(b) C < B < A
(c) B > C > A
(d) C > A > B
Answer
A
Question. Select R-isomers from the following
(a) I and III
(b) II, IV and V
(c) I, II and III
(d) II and m
(e) I, III and V
Answer
C
Question. Which of the following represents a set of nucleophiles?
(a) BF3, H2O, NH2 –
(b) AlCl3, BF3, NH3
(c) CN–, RCH2 –, ROH
(d) All of these
Answer
C
Question. Which of the following species does not acts as a nucleophile?
(a) ROH
(b) ROR
(c) PCl3
(d) BF3
Answer
D
Question. The following compound differ in
(a) configuration
(b) conformatio
(c) structure
(d) chirality
Answer
C
Question. Which of the following is an electrophile ?
(a) Lewis acid
(b) Lewis base
(c) Negatively charged species
(d) None of the above
Answer
A
Question. Which of the following pairs represent electrophiles?
(a) AlCl3, H2O
(b) SO3, NO2 +
(c) BF3, H2O
(d) NH3, SO3
Answer
B
Question. What is the structural formula of fumaric acid?
Answer
D
Question. Arrangement of (CH3)3 – C –, (CH3)2 – CH –, CH3 – CH2 – when attached to benzyl or an unsaturated group in increasing order of inductive effect is
(a) (CH3)3 –C – < (CH3)2 – CH – < CH3 – CH2 –
(b) CH3 –CH2– < (CH3)2– CH – < (CH3)3 –C –
(c) (CH3)2 – CH– < (CH3)3 –C – < CH3—CH2–
(d) (CH3)3 – C– < CH3 –CH2 – < (CH3)2 –CH –
Answer
B
Question. The absolute configuration of
(a) S,S
(b) R,R
(c) R,S
(d) S, R
Answer
B
Question. The least stable free radical is
(a) CH3 CH2
(b) CH3CH2 CH2
(c) (CH3)2CH
(d) CH3
Answer
D
Question. Which of the following is strongest nucleophile
(a) Br–
(b) : OH–
(c) : CN−
(d) C2H5O:
Answer
C
Question. Which of the following compound (s) has Z-configuration?
(a) Only I
(b) Only II
(c) Only III
(d) I and III
Answer
D
Question. Point out the incorrect statement about resonance?
(a) Resonance structures should have equal energy
(b) In resonating structures, the constituent atoms must be in the same position
(c) In resonating structures, there should not be same number of electron pairs
(d) Resonating structures should differ only in the location of electrons around the constituent atoms
Answer
C
Question. Electromeric effect is a
(a) permanent effect
(b) temporary effect
(c) resonance effect
(d) inductive effect
Answer
B
Question. Acyclic stereoisomer having the molecular formula C4H7Cl are classified and tabulated. Find out the correct set of numbers.
Answer
A
Question. The kind of delocalization involving sigma bond orbitals is called
(a) inductive effect
(b) hyperconjugation effect
(c) electromeric effect
(d) mesomeric effect
Answer
B
Question. Hyperconjugation involves overlap of the following orbitals
(a) σ-σ
(b) σ- π
(c) p- p
(d) π-π
Answer
B
Question. Hyperconjugation is most useful for stabilizing which of the following carbocations ?
(a) neo-Pentyl
(b) tert-Butyl
(c) iso-Propyl
(d) Ethyl
Answer
B
Question. In which of the following, resonance will be possible?
(a) CH3 − CH2 −CH2 − CHO
(b) CH2 = CH −CH = O
(c) CH3COCH3
(d) CH2 = CH −CH2 −CH − CH2
Answer
B
Question. The polarity is produced in the molecule by the interaction of two π – bonds or between a π – bond and lone pair of electrons present on an adjacent atom. The above statement s true for which of the following ?
(a) Inductive effect
(b) Electromeric effect
(c) Resonance effect
(d) Hyperconjugation
Answer
C
Question. Which of the following is an example of elimination reaction?
(a) Chlorination of methane
(b) Dehydration of ethanol
(c) Nitration of benzene
(d) Hydroxylation of ethylene
Answer
B
Question. CH3 – Br + NH3 →CH3 – NH2 + HBr The above reaction is classified as
(a) substitution
(b) addition
(c) elimination
(d) rearrangement
Answer
A
Question. In crystallisation process impurities which impart colour to the solution are removed by which of the following ?
(a) Repeated crystallisation
(b) Activated charcoal
(c) Bleaching agent
(d) Both (a) and (b)
Answer
B
Question. Aniline is purified by
(a) steam distillation
(b) simple distillation
(c) vacuum distillation
(d) extraction with a solvent
Answer
A
Question. Which is purified by steam distillation
(a) Aniline
(b) Benzoic acid
(c) Petroleum
(d) Naphthalene
Answer
A
Question. The best method for the separation of naphthalene and benzoic acid from their mixture is:
(a) distillation
(b) sublimation
(c) chromatography
(d) crystallisation
Answer
B
Question. Which of the following method is not used for determining purity of a compound ?
(a) Chromatographic techniques
(b) Spectroscopic techniques
(c) Melting point
(d) All of the above parameters are used for determining the purity of a compound.
Answer
D
Question. Which of the following is not the criteria of purity of a substance?
(a) solubility
(b) melting point
(c) boiling point
(d) density
Answer
A
Question. Purification of petroleum is carried out by
(a) fractional distillation
(b) steam distillation
(c) vacuum distillation
(d) simple distillation
Answer
A
Question. A liquid decomposes at its boiling point. It can be purified by
(a) steam distillation
(b) fractional distillation
(c) vacuum distillation
(d) sublimation
Answer
C
Question. Distillation under reduced pressure is employed for
(a) C6H6
(b) petrol
(c) CH2OHCHOHCH2OH
(d) organic compounds used in medicine
Answer
C
Question. Impure glycerine is purified by
(a) steam distillation
(b) simple distillation
(c) vacuum distillation
(d) None of these
Answer
C
Question. In steam distillation the vapour pressure of volatile organic compound is
(a) equal to atmospheric pressure
(b) double the atmospheric pressure
(c) less than atmospheric pressure
(d) more than atmospheric pressure
Answer
D
Question. Fractional distillation is used when
(a) there is a large difference in the boiling point of liquids
(b) there is a small difference in the boiling points of liquids
(c) boiling points of liquids are same
(d) liquids form a constant boiling mixture
Answer
B
Question. Which of the following is used as an adsorbent in adsorption chromatography ?
(a) Silica gel
(b) Alumina
(c) Zeolite
(d) Both (a) and (b)
Answer
D
Question. Which of the following acts as the stationary phase in paper chromatography ?
(a) Water
(b) Alumina
(c) Silica gel
(d) None of these
Answer
A
Question. The most satisfactory method to separate mixture of sugars is
(a) fractional crystallisation
(b) sublimation
(c) chromatography
(d) benedict reagent
Answer
C
Question. Chromatography is a valuable method for the separation, isolation, purification and identification of the constituents of a mixture and it is based on general principle of
(a) phase rule
(b) phase distribution
(c) interphase separation
(d) phase operation
Answer
B
Question. Glycerol can be separated from spent lye in soap industry by which of the following method ?
(a) Steam distillation
(b) Fractional distillation
(c) Distillation under reduced pressure
(d) Differential extraction
Answer
C
Question. The latest technique for the purification of organic compounds is
(a) chromatography
(b) fractional distillation
(c) crystallization
(d) vacuum distillation
Answer
A
Question. In paper chromatography
(a) moving phase is liquid and stationary phase in solid
(b) moving phase is liquid and stationary phase is liquid
(c) moving phase is solid and stationary phase is solid
(d) moving phase is solid and stationary phase is liquid
Answer
B
Question. Which of the following compounds does not show Lassaigne’s test for nitrogen ?
(a) Urea
(b) Hydrazine
(c) Phenylhydrazine
(d) Azobenzene
Answer
B
Question. The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is
(a) Fe4[Fe(CN)6]3
(b) Na3[Fe(CN)6]
(c) Fe(CN)3
(d) Na4[Fe(CN)5NOS]
Answer
A
Question. Kjeldahl method is not applicable to which of the following ?
(a) Nitro compounds
(b) Azo compounds
(c) Pyridine
(d) All of these.
Answer
D
Question. Nitrogen in an organic compound can be estimated by
(a) Kjeldahl’s method only
(b) Duma’s method only
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Answer
C
Question. Duma’s method involves the determination of nitrogen content in the organic compound in form of
(a) NH3
(b) N2
(c) NaCN
(d) (NH4)2SO4
Answer
B
Question. Which of the following is used for detection of carbon and hydrogen ?
(a) Ca(OH)2
(b) CuO
(c) CaCl2
(d) KOH
Answer
B
