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1

AIPMT 2001

MCQ (Single Correct Answer)

obtained by chlorination of n-butane will be
A
meso form
B
racemic mixture
C
d-form
D
$$l$$-form

Explanation

Chlorination of n-butane takes place via free radical formation.
2

AIPMT 2001

MCQ (Single Correct Answer)
An organic compound A(C4H9Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then, A is
A
t-butyl chloride
B
s-butyl chloride
C
iso-butyl chloride
D
n-butyl chloride

Explanation

2C4H9Cl+2Na $$\buildrel {Ethanol} \over \longrightarrow $$ C4H9 - C4H9 + 2NaCl

In C4H9 - C4H9 i.e., (H3C)3C—C(CH3)3 there are primary hydrogens only.

Thus, only one chloro derivative is possible.
3

AIPMT 2001

MCQ (Single Correct Answer)
A compound of molecular formula C7H16 shows optical isomerism, compound will be
A
2, 3-dimethylpentane
B
2, 2-dimethylbutane
C
2-methylhexane
D
none of these

Explanation

Organic compounds exhibit the property of enantiomerism (optical isomerism) only when their molecules are chiral. Most chiral compounds have a chiral centre, which is an atom bonded to four different atoms or groups.
2,3-Dimethylpentane has one chiral C-atom and do not have any symmetric element.

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