Which of the following compounds on reaction with $\mathrm{CH}_3 \mathrm{MgBr}$ will give a tertiary alcohol?

• A

  $\mathrm{C}_6 \mathrm{H}_5 \mathrm{CHO}$
• Correct answer
  B

  $\mathrm{C}_2 \mathrm{H}_5 \mathrm{CO}_2 \mathrm{C}_2 \mathrm{H}_5$
• C

  $\mathrm{C}_2 \mathrm{H}_5 \mathrm{COOH}$
• D

  
  

Solution

Esters react with Grignard reagent to form tertiary $\left(3^{\circ}\right)$ alcohols. The complete reaction is given as follows

Hence, the correct answer is option: 'B'.