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Question
The order or reactivity of phenyl magnesium bromide with the following compounds is:
(I) CH3−O||C−CH3(II) H−O||C−CH3
(III) Ph−O||C−Ph
The order or reactivity of phenyl magnesium bromide with the following compounds is:
(I) CH3−O||C−CH3
(II) H−O||C−CH3
(III) Ph−O||C−Ph
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Solution
The correct option is C (II) > (I) > (III)
This is nucleophilic addition reaction to carbonyl group as the Grignard reagent acts as nucleophile.
The carbon atom of C=O group should be more electron defecient for faster attack of nucleophile.
Aldehydes have less electron-density than ketones, hence aldehydes are more reactive than ketones.
The steric hinderance also affect the reactivity, so the III is least reactive due to bulky phenyl rings which slows down the nucleophilic attack.
Option C is correct.
This is nucleophilic addition reaction to carbonyl group as the Grignard reagent acts as nucleophile.
The carbon atom of C=O group should be more electron defecient for faster attack of nucleophile.
Aldehydes have less electron-density than ketones, hence aldehydes are more reactive than ketones.
The steric hinderance also affect the reactivity, so the III is least reactive due to bulky phenyl rings which slows down the nucleophilic attack.
Option C is correct.
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