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NEET Chemistry MCQ
Isomerism And Steroisomerism Mcq Neet Chemistry
Quiz 1
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Q.1
The isomers which canbe converted into another form by rotation of the molecule aronud single bond are ...[ AIIMS 1997]
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a) Geometricalisomers
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b) Conformers
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c) Enantiomers
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d) Diastereomers
Explanation
Answer:(b)
Q.2
Opticalisomerism aries from the presence of ...[ DPMT1994]
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a) An asymmetric carbon atom
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b) A centre ofsymmetry
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c) A line of symmetry
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d) Any of the above
Explanation
Answer:(a)
Q.3
Which of the following has zerodipole moment? [ Haryana CEET 1998]
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a) 1, 1-Dichloromethane
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b) cis-1, 2-Dichloroethene
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c) trans-1, 2-Dichloroethane
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d) 1-Chloroethane
Explanation
Answer:(c)
Q.4
tion Q4) The pair of structures given below represent
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a) Enantiomers
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b) Diastereomers
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c) Structuralisomers
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d) Two molecules of the same compund
Explanation
Answer:(c)
Q.5
Which of the following compounds exhibits geometrical isomerism? [ BHU 1994]
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a) C2H5Br
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b) (CH)2(COOH)2
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c) CH3CHO
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d) (CH2)2(COOH)2
Explanation
Geometric isomers are chemical species with the same type and quantity of atoms as another species, yet having a different geometric structure. Atoms or groups exhibit different spatial arrangements on either side of a chemical bond or ring structure. Have double bond between carbon atoms. (CH)2(COOH)2 is maleic acid, have cis and trans structures Answer:(b)
Q.6
A similarity between optical and geometrical isomerismis that ..[ AIEEE 2002]
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a) each forms equal number of isomers for a given compound
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b) if in a compound, one is present then so is the other
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c) both are included in steroisomerism
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d) they have no similarity
Explanation
Answer:(c)
Q.7
tion Q7) Among the following four structures I to IV Is it true that
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a) Only II nad IV are chiral compounds
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b) All four are chiral compounds
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c) Only I nad II are chiral compounds
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d) Only II is a chiral compound
Explanation
Only I nad II are chiral compounds as they contain chiral C -atom Answer:(c)
Q.8
(+)-Mandelic acid has a specific rotation of +158°. What would be the observed rotation of mixture of 25%(-)-mandelicacid and 75%(+)-mandelic acid ..
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a) +118.5°
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b) -118.5°
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c) -79°
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d) +79°
Explanation
Specific rotation of the mixture = (75/100) (+158°)+ (25/100)(-158°) = +79° Answer:(d)
Q.9
In keto-enol tautomerism of dicarbonyl compounds, the enol form is preferred in contrast to the keto-form, this is due to ..[ Pb CET1996]
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a) Presenceof carbonyl group on each side of -CH2 - group
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b) Resonance stabilization of enol form
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c) Presence of methylene group
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d) Rapid chemical exchage.
Explanation
Resonance stabilization of enol form as shown Answer:(b)
Q.10
ion Q10) C6H5C ≡N and are which types of isomers? [ CPMT 1997]
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a) Position
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b) Functional
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c) Tautomerism
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d) Linkage
Explanation
Answer:(b)
Q.11
cis-2-Butene and trans-2-Butene can be distingished on the basis of
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a) their properties
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b) their reduction products
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c) the products that give on ozonolysis
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d) the products they give on addition of bromine
Explanation
Answer:(d)
Q.12
Which of the following is optically active? [Haryana CEET 2000]
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a) Butane
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b) 4-Methylheptane
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c) 3-Methylheptane
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d) 2-Methylpentane
Explanation
3-Methylheptane has a chiral carbon and hence is optically active Answer:(c)
Q.13
(S)-2-Methylbutanol oxidation with chromic acid gives
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a) (R)-2-Methylbutanoic acid
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b) (S)-2-Methylbutanoic acid
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c) (RS)-2-Methylbutanoic acid
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d) No reaction
Explanation
when alcohol is oxidised in presence of chromic acid, it get converted into carboxylic acid. According to golden rule of R,S configuration order of priority when alcohol is present and when carboxylic acid is present is same. Hence the configuration of obtained product would be same. For more information visit isomerism Answer:(b)
Q.14
Which of the following compounds exhibits stereoisomerism? [ IIT 2002]
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a) 2-Methylbutene-1
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b) 3-Methylbutyne-1
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c) 3-Methylbutanoic acid
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d) 2-Methylbutanoic acid
Explanation
Answer:(d)
Q.15
How manychain isomers couldbe obtained from the alkane C6H14 [ CBSE PMT 1988]
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a) Four
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b) Five
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c) Six
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d) seven
Explanation
Answer:(b)
Q.16
A compound with molecular formula, C7H16 shows optical isomerism, the compound will be ...[ CBSE PMT2001]
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a) 2, 3-dimethylpentane
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b) 2, 2-dimethylpentane
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c) 2-methylhexane
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d) none of these
Explanation
2, 3-Dimethylpentane has a chiral carbon and hence is optically active Answer:(a)
Q.17
Maximum number of isomers of an alkene with the molecular formula C4H8 is ..[ IIT 1982]
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a) Two
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b) Three
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c) Four
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d) Five
Explanation
1-butene,cis-2-butene,trans-2-butene, 2-methylpropene Answer:(c)
Q.18
The number of possible enantiomeric pairs that can be produced during monochlorination of 2-methyl-butane is ..[ IIT 1997]
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a) 2
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b) 3
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c) 4
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d) 1
Explanation
Four isomers ,two pairs Answer:(a)
Q.19
ion Q19) Hydrogen of the compound shown belowin the presence of poisoned palladium catalyst gives {IIT 2001]
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a) Optically active compound
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b) an opticallyinactive compound
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c) a racemic mixture
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d) a diasteremeric mixtures
Explanation
Due to addition of hydrogen to the triple bond, the reduced product has a plane of symmetry and hence is opticvally inactive Answer:(b)
Q.20
The process of separation of a racemic modificationinto d- and l- enantiomers is called ..[ CBSE PMT 1994]
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a) Resolution
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b) Dehydration
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c) Revolution
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d) Dehyrohalogenation
Explanation
Answer:(a)
Q.21
Isomers of a substance must have the same ...[ CBSE PMT 1991]
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a) Structural formula
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b) Physical formula
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c) Chemical properties
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d) Molecular formula
Explanation
Answer:(d)
Q.22
The total number of isomeric trimethylbenzene is ...[ MP CET 1998]
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a) 2
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b) 3
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c) 4
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d) 6
Explanation
Answer:(b)
Q.23
Number of stereomers of the compound,2-chloro-4-methylhex-2-ene is /are ...[ Haryana CEET 2000]
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a) 1
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b) 2
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c) 4
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d) 16
Explanation
Here two carbon atoms are chiral So it will have 22 = 4 number of stereo-isomers Answer:(c)
Q.24
Which of the following does not show geometrical isomerism? ...[ AIEEE 2002]
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a) 1,2-dichloro-1-pentene
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b) 1,3-dichloro-2-pentene
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c) 1,1-dichloro-1-pentene
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d) 1,4-dichloro-2-pentene
Explanation
1,1-dichloro-1-pentene does not show geometrical isomerism since it has two identical atoms i.e. Cl on C1 Answer:(c)
Q.25
The restricted rotation about carbob-carbon double bond in 2-butene is due to [ CBSE PMT 1993]
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a) Overlap of one s- and sp2- hybridized orbitals
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b) Overlap of two sp2- hybridized orbitals
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c) Overlap of one p- and sp2- hybridized orbitals
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d) Sideways overlap of two p-orbitals
Explanation
Answer:(d)
Q.26
rism and Steroisomerism gneetStudy Companion For more NEET and AIIMS mcq on Isomerism and Steroisomerism Question Q26)The compound given below are
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a) Enantiomers
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b) Identical
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c) Regiomers
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d) Diastereomers
Explanation
The two counds are identical since they have a plane of symmetry Answer:(b)
Q.27
Which are isomers? [ Pb CET 1997]
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a) Ethyl alcohol and dimethyl ether
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b) Acetone and acetaldehyde
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c) Propionic acid and propanone
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d) Methyl alcohol and dimethyl ether
Explanation
Answer:(a)
Q.28
Opticallyactive isomers but not mirror images are called ... [ MPPMT 1999]
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a) Enantiomers
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b) Mesomers
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c) Tautomers
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d) Diasteremores
Explanation
Answer:(d)
Q.29
The number of structural and configurational isomers of bromo compound, C5H9Br, formed by the addition of HBr to2-pentynerespectively are ..[ IIT 1988]
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a) 1 and 2
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b) 2 and 4
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c) 4 and 2
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d) 2 and 1
Explanation
Addition of HBr to 2-pentynegives two isomers (i)CH3C(Br)=CHCH2CH3 and (ii) CH3CH = C(Br)CH2CH3 Each of these will exist as a pair of geometrical isomers. Thus two structural and four configurational isomers isomers Answer:(b)
Q.30
In the reaction, CH3CHO + HCN → CH3CH(OH)CN a chiral centre is produced. Thisproduct would be ..[ CBSEPMT 1995]
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a) Laevorotatory
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b) Meso-compound
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c) Dextrorotatory
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d) Racemic mixture
Explanation
Answer:(d)
0 h : 0 m : 1 s
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