The order of reactivity of phenyl magnesium bromide with the following compounds is

Question

The order of reactivity of phenyl magnesium bromide with the following compounds is (A) (II) > (III) > (I) (B) (I) > (III) > (II) (C) (II) > (I) > (III) (D) All of the above

Tardigrade Admin · Accepted Answer

The reactivity of carbonyl compound towards nucleophilic addition of Grignard- reagent depends on extent of steric hindrance at a-carbon. Greater the steric hindrance smaller the reactivity. Hence, reactivity order is

II C H_{3} C H O > I C H_{3} - CO - C H_{3} > III P h - CO - P h

Q. The order of reactivity of phenyl magnesium bromide with the following compounds is

(II) > (III) > (I)

(I) > (III) > (II)

(II) > (I) > (III)

All of the above

The reactivity of carbonyl compound towards nucleophilic addition of Grignard- reagent depends on extent of steric hindrance at a-carbon. Greater the steric hindrance smaller the reactivity. Hence, reactivity order is IICH3​CHO​>ICH3​−CO−CH3​​>IIIPh−CO−Ph​

The reactivity of carbonyl compound towards nucleophilic addition of Grignard- reagent depends on extent of steric hindrance at a-carbon. Greater the steric hindrance smaller the reactivity. Hence, reactivity order is
$II C H_{3} C H O > I C H_{3} - CO - C H_{3} > III P h - CO - P h$