What will be the reactivity order of following compounds with $P h M g B r$ ?
(I) $C H_{3} C H O$
(II) $P h C H O$
(III) $C H_{3} C O P h$
(IV) $H C H O$

I I I > I I > I > I V

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I V > I > I I I > I I

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I V > I > I I > I I I

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I > I V > I I > I I I

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Solution

The correct option is D $I V > I > I I > I I I$
The increasing order of steric hindrance towards nucleophile is $H C H O < C H_{3} C H O < P h C H O < C H_{3} C O P h$

The decreasing order of the electrophilic character of carbonyl carbon is $H C H O > C H_{3} C H O > P h C H O > C H_{3} C O P h$ .

More the electron defecient nature of carbon and less steric hinderance more is the reactivity.

The reactivity order of following compounds with $P h M g B r$ is $H C H O > C H_{3} C H O > P h C H O > C H_{3} C O P h$ .

Option C is correct.

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What will be the reactivity order of following compounds with $P h M g B r$ ?
(I) $C H_{3} C H O$
(II) $P h C H O$
(III) $C H_{3} C O P h$
(IV) $H C H O$