Q.1
The isomers which canbe converted into another form by rotation of the molecule aronud single bond are ...[ AIIMS 1997]
  • a) Geometricalisomers
  • b) Conformers
  • c) Enantiomers
  • d) Diastereomers
Q.2
Opticalisomerism aries from the presence of ...[ DPMT1994]
  • a) An asymmetric carbon atom
  • b) A centre ofsymmetry
  • c) A line of symmetry
  • d) Any of the above
Q.3
Which of the following has zerodipole moment? [ Haryana CEET 1998]
  • a) 1, 1-Dichloromethane
  • b) cis-1, 2-Dichloroethene
  • c) trans-1, 2-Dichloroethane
  • d) 1-Chloroethane
Q.4
tion Q4) The pair of structures given below represent
ch-22_que_no-4_img_no1.png
  • a) Enantiomers
  • b) Diastereomers
  • c) Structuralisomers
  • d) Two molecules of the same compund
Q.5
Which of the following compounds exhibits geometrical isomerism? [ BHU 1994]
  • a) C2H5Br
  • b) (CH)2(COOH)2
  • c) CH3CHO
  • d) (CH2)2(COOH)2
Q.6
A similarity between optical and geometrical isomerismis that ..[ AIEEE 2002]
  • a) each forms equal number of isomers for a given compound
  • b) if in a compound, one is present then so is the other
  • c) both are included in steroisomerism
  • d) they have no similarity
Q.7
tion Q7) Among the following four structures I to IV Is it true that
ch-22_que_no-7_img_no1.png
  • a) Only II nad IV are chiral compounds
  • b) All four are chiral compounds
  • c) Only I nad II are chiral compounds
  • d) Only II is a chiral compound
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 ..
  • a) +118.5°
  • b) -118.5°
  • c) -79°
  • d) +79°
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]
  • a) Presenceof carbonyl group on each side of -CH2 - group
  • b) Resonance stabilization of enol form
  • c) Presence of methylene group
  • d) Rapid chemical exchage.
Q.10
ion Q10) C6H5C ≡N and are which types of isomers? [ CPMT 1997]
ch-22_que_no-10_img_no1.png
  • a) Position
  • b) Functional
  • c) Tautomerism
  • d) Linkage
Q.11
cis-2-Butene and trans-2-Butene can be distingished on the basis of
  • a) their properties
  • b) their reduction products
  • c) the products that give on ozonolysis
  • d) the products they give on addition of bromine
Q.12
Which of the following is optically active? [Haryana CEET 2000]
  • a) Butane
  • b) 4-Methylheptane
  • c) 3-Methylheptane
  • d) 2-Methylpentane
Q.13
(S)-2-Methylbutanol oxidation with chromic acid gives
  • a) (R)-2-Methylbutanoic acid
  • b) (S)-2-Methylbutanoic acid
  • c) (RS)-2-Methylbutanoic acid
  • d) No reaction
Q.14
Which of the following compounds exhibits stereoisomerism? [ IIT 2002]
  • a) 2-Methylbutene-1
  • b) 3-Methylbutyne-1
  • c) 3-Methylbutanoic acid
  • d) 2-Methylbutanoic acid
Q.15
How manychain isomers couldbe obtained from the alkane C6H14 [ CBSE PMT 1988]
  • a) Four
  • b) Five
  • c) Six
  • d) seven
Q.16
A compound with molecular formula, C7H16 shows optical isomerism, the compound will be ...[ CBSE PMT2001]
  • a) 2, 3-dimethylpentane
  • b) 2, 2-dimethylpentane
  • c) 2-methylhexane
  • d) none of these
Q.17
Maximum number of isomers of an alkene with the molecular formula C4H8 is ..[ IIT 1982]
  • a) Two
  • b) Three
  • c) Four
  • d) Five
Q.18
The number of possible enantiomeric pairs that can be produced during monochlorination of 2-methyl-butane is ..[ IIT 1997]
  • a) 2
  • b) 3
  • c) 4
  • d) 1
Q.19
ion Q19) Hydrogen of the compound shown belowin the presence of poisoned palladium catalyst gives {IIT 2001]
ch-22_que_no-19_img_no1.png
  • a) Optically active compound
  • b) an opticallyinactive compound
  • c) a racemic mixture
  • d) a diasteremeric mixtures
Q.20
The process of separation of a racemic modificationinto d- and l- enantiomers is called ..[ CBSE PMT 1994]
  • a) Resolution
  • b) Dehydration
  • c) Revolution
  • d) Dehyrohalogenation
Q.21
Isomers of a substance must have the same ...[ CBSE PMT 1991]
  • a) Structural formula
  • b) Physical formula
  • c) Chemical properties
  • d) Molecular formula
Q.22
The total number of isomeric trimethylbenzene is ...[ MP CET 1998]
  • a) 2
  • b) 3
  • c) 4
  • d) 6
Q.23
Number of stereomers of the compound,2-chloro-4-methylhex-2-ene is /are ...[ Haryana CEET 2000]
  • a) 1
  • b) 2
  • c) 4
  • d) 16
Q.24
Which of the following does not show geometrical isomerism? ...[ AIEEE 2002]
  • a) 1,2-dichloro-1-pentene
  • b) 1,3-dichloro-2-pentene
  • c) 1,1-dichloro-1-pentene
  • d) 1,4-dichloro-2-pentene
Q.25
The restricted rotation about carbob-carbon double bond in 2-butene is due to [ CBSE PMT 1993]
  • a) Overlap of one s- and sp2- hybridized orbitals
  • b) Overlap of two sp2- hybridized orbitals
  • c) Overlap of one p- and sp2- hybridized orbitals
  • d) Sideways overlap of two p-orbitals
Q.26
rism and Steroisomerism gneetStudy Companion For more NEET and AIIMS mcq on Isomerism and Steroisomerism Question Q26)The compound given below are
ch-22_que_no-26_img_no1.png
  • a) Enantiomers
  • b) Identical
  • c) Regiomers
  • d) Diastereomers
Q.27
Which are isomers? [ Pb CET 1997]
  • a) Ethyl alcohol and dimethyl ether
  • b) Acetone and acetaldehyde
  • c) Propionic acid and propanone
  • d) Methyl alcohol and dimethyl ether
Q.28
Opticallyactive isomers but not mirror images are called ... [ MPPMT 1999]
  • a) Enantiomers
  • b) Mesomers
  • c) Tautomers
  • d) Diasteremores
Q.29
The number of structural and configurational isomers of bromo compound, C5H9Br, formed by the addition of HBr to2-pentynerespectively are ..[ IIT 1988]
  • a) 1 and 2
  • b) 2 and 4
  • c) 4 and 2
  • d) 2 and 1
Q.30
In the reaction, CH3CHO + HCN → CH3CH(OH)CN a chiral centre is produced. Thisproduct would be ..[ CBSEPMT 1995]
  • a) Laevorotatory
  • b) Meso-compound
  • c) Dextrorotatory
  • d) Racemic mixture
0 h : 0 m : 1 s