What type of product is obtained when formaldehyde reacts with $\mathrm{CH}_3 \mathrm{MgBr}$ in dry ether?

• A

  Primary alcohol with same number of carbon atoms as in aldehyde.
• Correct answer
  B

  Primary alcohol with one carbon atom more than aldehyde.
• C

  Secondary alcohol with one carbon atom more than aldehyde.
• D

  Tertiary alcohol with two carbon atoms more than aldehyde.

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