1
MCQ (Single Correct Answer)

AIPMT 2004

Reaction of HBr with propene in the presence of peroxide gives
A
isopropyl bromide
B
3-bromopropane
C
allyl bromide
D
n-propyl bromide

Explanation

Reaction of HBr with propene in the presence of peroxide gives n-propyl bromide. This addition reaction is an example of anti-Markovnikov’s addition reaction.

2
MCQ (Single Correct Answer)

AIPMT 2004

Using anhydrous AlCl3 as catalyst, which one of the following reactions produces ethylbenzene (PhEt)?
A
H3C $$-$$ CH2OH + C6H6
B
CH3 $$-$$ CH $$=$$ CH2 + C6H6
C
H2C $$=$$ CH2 + C6H6
D
H3C $$-$$ CH3 + C6H6

Explanation

With ethene in presence of anhydrous AlCl3, benzene gives ethyl benzene (PhEt).
3
MCQ (Single Correct Answer)

AIPMT 2003

The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I), benzene (II) and nitrobenzene (III) is
A
III > II > I
B
II > III > I
C
I < II > III
D
I > II > III

Explanation



–NH2 group is electron donating hence increases electron density on ring. Benzene is also electron rich due to delocalisation of electrons. –NO2 group is electron withdrawing hence, decreases electron density on ring. Thus, correct order for electrophilic substitution is I $$>$$ II $$>$$ III.
4
MCQ (Single Correct Answer)

AIPMT 2003

Which one of the following is a free-radical substitution reaction ?
A
B
C
D

Explanation

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