What will be the reactivity order of following compounds with - PhMgBr-I- - CH-3CHO- -II- - PhCHO-III- - CH-3COPh-IV- - HCHO- III gt- II gt- I gt- IV- IV gt- I gt- III gt- II- I gt- IV gt- II gt- III- IV gt- I gt- II gt- III-

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Free Radical Mechanism

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Question

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 PhMgBr?(I) CH3CHO (II) PhCHO(III) CH3COPh(IV) HCHO

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) $H C H O$