Q.1.
If there is no rotation of plane polarized light by a compound in a specific solvent thought to be chiral. it may mean that .. [ AIPMT 2007]
-
50%
a) the compound may be a racemic mixture
-
17%
b) compound is certainly a chiral
-
17%
c) the compound is certainly meso
-
17%
d) there is no compound in the solvent
Q.2.
ion Q62) The following two compounds are
-
43%
a) Enantiomers
-
29%
b) Diasteromers
-
14%
c) Identical
-
14%
d) Epimers
Q.3.
RNA and DNA are chiral molecules their cllirality is due to
-
0%
a) D-sugar component
-
20%
b) L-sugar component
-
20%
c) Chiral bases
-
60%
d) Chiral phosphate ester groups
Q.4.
ion Q64) The consider the following organic compound, To make it a chiral compound, the attack should be on carbon ...[ DEC2001]
-
0%
a) 1
-
50%
b) 3
-
0%
c) 4
-
50%
d) 7
Q.5.
Which one of the following can exhibit cis-trans isomerism? .. [CBSE PMT 1989]
-
0%
a) CH3 - CHCl - COOH
-
80%
b) H-C ≡ C-Cl
-
20%
c) ClCH = CHCl
-
0%
d) ClCH2-CH2Cl
Q.6.
hich one of the following does not exhibit thephenomenon of mutarotation? [ AIPMT 2010]
-
33%
a) (+) Sucrose
-
0%
b) (+) Lactose
-
33%
c) (+) Maltose
-
33%
d) (–) Fructose
Q.7.
The numberof possible open chain (acyclic) isomeric compounds for molecular formula C5H10 would be ..[ AMU 1997]
-
0%
a) 8
-
33%
b) 7
-
67%
c) 6
-
0%
d) 5
Explanation
Q.8.
An organic compound will show optical isomerism if ... [ MPPMT 1999]
-
50%
a) four groupos attached to C atom are different
-
0%
b) three groups attached to C atoms are different
-
17%
c) two group attached to C atoms are different
-
33%
d) all the groups attached to C atom are same
Q.9.
In the following the most stable conformation of n-butane is: [ AIPMT 2010]
-
33%
a)
-
67%
b)
-
0%
c)
-
0%
d)
Q.10.
Which organicstructure among the following is not an isomer of the compound CH3 - CO -CH2-CH2CH2-CH3
-
33%
a) CH3CH2OCH = CHCH2CH3
-
33%
b) CH3CH = CHCH2CH2CHO
-
0%
c) (CH3)2CH - CO- CH2CH3
-
33%
d) CH3CH2COCH2CH2CH3
Q.11.
ion Q71) Given Which of the given compounds can exhibit tautormerism ?
-
20%
a) I, II and III
-
20%
b) I and II
-
40%
c) I and III
-
20%
d) II and III
Q.12.
The prefixes and anti areused to denote ..[ DPMT 2002]
-
25%
a) Structural isomers
-
25%
b) Conformatonal isomers
-
50%
c) Geometrical isomers
-
0%
d) Optical isomers
Q.13.
Which of the following compounds is isomeric with 2,2,4,4-tetramethylhexane ..[ AMU 1997]
-
33%
a) 3-Ethyl-2,2-dimethylpentane
-
0%
b) 4-Isopropylheptane
-
67%
c) 4-Ethyl-3-methyl-4-n-propyloctane
-
0%
d) 4,4-Diethyl-3-methylheptane
Q.14.
ion Q74) Given Which of the given compounds can exhibit tautormerism ? [ AIPMT 2015]
-
40%
a) I, II and III
-
20%
b) I and II
-
40%
c) I and III
-
0%
d) II and III
Q.15.
An organic molecule necessarilyshows optical acrivity if it ,,, [ Roorkee 1993]
-
50%
a) contains asymmetric carbon atoms
-
0%
b) is non-polar
-
0%
c) is non-superimposable on its mirror image
-
50%
d) is superimposable on its mirror image
Q.16.
An enantiometricallypure acidis treatedwith mixture of an alcohol havingone chiral carbon. Theester formed will be ..[ IIT 2003]
-
50%
a) Optically active mixture
-
0%
b) Pureenantiomer
-
50%
c) Meso compound
-
0%
d) Racemicmixture
Q.17.
The optically active tartaric acid is named as D-(+)- tartaric acid because it has a positive..[ IIT1999]
-
33%
a) Optical rotation and is derived from D-glucose
-
0%
b) pH in organic solvent
-
33%
c) Optical rotation and is derived from D-(+)-glyceraldehyde
-
33%
d) optical rotation only when substituted by deduterium
Q.18.
The correct statement regarding the comparison of staggered and eclipsed conformation of ethane, is :- [ NEET 2016]
-
0%
a) The staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain
-
50%
b) The eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has no torsional strain
-
25%
c) The eclipsed conformation of ethane is more stable than staggered conformation even through the eclipsed conformation has torsional strain
-
25%
d) The staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
Q.19.
ion Q79) The correct corresponding order names of four aldoses with configuration given below respectively, is :-
-
25%
a) L-erythrose, L-threose, D-erythrose, D-threose
-
50%
b) D-erythrose, D-threose, L-erythrose, L-threose
-
25%
c) L-erythrose, L-threose, L-erythrose, D-threose
-
0%
d) D-threose, D-erythrose, L-threose, L-erythrose
Q.20.
The most stable conformation of ethylene glycol is ..[ JIPMER 2001]
-
40%
a) Anti
-
20%
b) Gauche
-
20%
c) Partially eclipsed
-
20%
d) Fully eclipsed
Q.21.
With respect to the conformers of ethane, which of the following statements is true ?
-
0%
a) Bond angle changes but bond length remains same
-
0%
b) Both bond angle and bond length change
-
50%
c) Both bond angles and bond length remains same
-
50%
d) Bond angle remains same but bond length changes
Q.22.
The (R)- and (S)- enantiomers of an optically active compound differ in ...[ CBSE PMT 2000 ]
-
0%
a) their reactivity with achiral reagents
-
50%
b) their optical rotation of plane polarized light
-
0%
c) their melting points
-
50%
d) their solubility in achiral reagent
Q.23.
How many optically active stereoisomers are posible for butane-2,3-diol? [ IIT 1997]
-
0%
a) 1
-
0%
b) 2
-
0%
c) 3
-
100%
d) 4
Q.24.
The letter 'D' in D-glucose signifies ..[ NEET Guj 2017]
-
0%
a) Configuration at all chiral carbons
-
67%
b) Dextrorotatory
-
0%
c) That it is a monosaccharide
-
33%
d) Configuration at a particular chiral carbon
Q.25.
A compound which is not isomeric with diethylether is ...[ CPMT 1989]
-
0%
a) n-Propyl methyl ether
-
25%
b) 1-butanol
-
25%
c) 2-methyl-2propanol
-
50%
d) butanone
Q.26.
The correct statement regarding ethane conformationis : [NEET Guj 2017 ]
-
0%
a) Rotation around carbon-carbon bond in ethane molecule is not possible, because ethane molecule contains a pi (π) bond between the carbon and carbon and ethane has very low melting Point.
-
50%
b) Rotation atound carbon-carbon bond in ethane molecule is not possible, because ethane molecule contains both srgma (σ) bond and pi (π) bond between the carbon and carbon.
-
50%
c) Rotation around carbon-carbon bond in ethane molecule is possible because of cylindrical symmetry of sigma (σ) bond between carbon-carbon a toms.
-
0%
d) Rotation around carbon-carbon bond in ethane molecule is not possible, because ethane molecule contains hoth sigma (σ)bond and pi (π) bond between the carbon and carbon and ethane has very high bo ing point
Q.27.
The most stable conformation of n-butane is ...[ CBSE PMT 1997]
-
0%
a) skew-boat
-
0%
b) eclipsed
-
0%
c) Gauche
-
100%
d) Staggered-antil.
Q.28.
The Baeyer's angle strain is expected to be maximum in ...
-
0%
a) Cyclodecane
-
75%
b) Cyclopentane
-
0%
c) Cyclohexane
-
25%
d) Cyclooctane
Q.29.
ionMore than one correct answer Q89) The correct statement(s) for the following addition reactions is(are) [IIT Advance2017]
-
50%
a) (M and O) and (N and P) are two pairs of diastereomers
-
0%
b) Bromination proceeds through trans-addition in both the reactions
-
50%
c) O and P are identical molecules
-
0%
d) (M and O) and (N and P) are two pairs of enantiomers
Explanation
Q.30.
Fischer projection indicates
-
0%
a) Horizontal substituents above the plane
-
50%
b) Vertical substituents above the plane
-
0%
c) Both horizontal and vertical substituents below the plane
-
50%
d) Both horizontal and vertical substituents above the plane