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Electrophilic Substitution Reactions of Haloarenes

Arrange the f...

Question

Arrange the following compound in decreasing order of reactivity towards addition reaction.
(I) $C_{6} H_{3} C O C H_{3}$
(II) $C H_{3} C O C_{2} H_{5}$
(III) $C_{6} H_{3} C H O$
(IV) $C H C H_{2} C H O$

A

I V > I I I > I I > I

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B

I V > I I > I I I > I

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C

I > I I > I I I > I V

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D

I I I > I V > I I > I

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Solution

The correct option is B $I V > I I > I I I > I$
The reactivity of addition reaction will decrease if the carbonyl carbon is made less electrophilic, by electron pushing groups or resonance. The reactivity is decreased more when there is phenyl group attached to the carbonyl carbon. According to this the order of reactivity is, $I V > I I > I I I > I$ .
Option B is the correct answer.

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Electrophilic Substitution Reactions of Haloarenes

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