1
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).
2
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.
3
MCQ (Single Correct Answer)

AIPMT 2003

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

Explanation

4
MCQ (Single Correct Answer)

AIPMT 2003

The compound

on reaction with NaIO4 in the presence of KMnO4 gives
A
CH3COCH3
B
CH3COCH3 + CH3COOH
C
CH3COCH3 + CH3CHO
D
CH3CHO + CO2

Explanation

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