Question

The correct order of reactivity of $PhMgBr$ towards
(I) Benzophenone (II) Acetaldehyde (III) Acetone
is:

• A. $\left(I\right)>\left(II\right)>\left(III\right)$
• B. $\left(III\right)>\left(II\right)>\left(I\right)$
• C. $\left(II\right)>\left(III\right)>\left(I\right)$
• D. $\left(I\right)>\left(III\right)>\left(II\right)$

Answer 1

The correct option is C $\left(II\right)>\left(III\right)>\left(I\right)$

There are two important factors which help in comparing the relative reactivity of aldehydes and ketones in a nucleophilic addition reaction.
(A) Steric factors
(B) Electronic factors

Considering these factors the order will be:$\left(II\right)>\left(III\right)>\left(I\right)$