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1

AIPMT 2007

MCQ (Single Correct Answer)
CH3 $$-$$ CHCl $$-$$ CH2 $$-$$ CH3 has a chiral centre. Which one of the following represents its R-configuration?
A
B
C
D

Explanation

2

AIPMT 2006

MCQ (Single Correct Answer)
Which of the following is not chiral?
A
2-Hydroxypropanoic acid
B
2-Butanol
C
2,3-Dibromopentane
D
3-Bromopentane

Explanation



Due to absence of asymmetric carbon atom.
3

AIPMT 2004

MCQ (Single Correct Answer)
Which of the following is least reactive in a nucleophilic sibstitution reaction?
A
(CH3)3C $$-$$ Cl
B
CH2$$=$$CHCl
C
CH3CH2Cl
D
CH2$$=$$CHCH2Cl

Explanation

Chlorine of vinyl chloride (CH2==CHCl) is non-reactive substitution reaction because it shows the following resonating structure due to +M effect of –Cl atom.

In second Cl–atom has positive charge and partial double bond character with C of vinyl group, so it is more tightly attracted towards the nucleus and it does not get replaced by nucleophile in nucleophilic substitution reaction.
4

AIPMT 2003

MCQ (Single Correct Answer)
Which of the following pairs of compounds are enantiomers?
A
B
C
D

Explanation

These two are non-superimposable mirror images of each other, so they are enantiomers.

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