Question

How will you obtain tertiary alcohol from Grignard reagent?

Answer 1

The nucleophilic addition of grignard reagent to ketone (in ether solvent) forms a complex. The acid hydrolysis of the complex gives tertiary alcohol.
$C{H}_3-\underset{\underset{\text{O}}{||}}{C}-C{H}_3\underset{2)H^{+}/H_{2}O}{\overset{1)C{H}_3-Mg-I/\text{dry ether}}{\to }}C{H}_3-\underset{\underset{\text{OH}}{|}}{\stackrel{\stackrel{C{H}_3}{|}}{C}}-C{H}_3+I-Mg-OH$