Reaction of methyl bromide with aqueous sodium hydroxide involves

• A

  racemisation
• B

  $S_{N} 1$ mechanism
• C

  retention of configuration
• Correct answer
  D

  $\mathrm{S}_{\mathrm{N}} 2$ mechanism

Solution

Since, the reaction rate depends upon the concentration of both reactant and nucleophile, it is a $\mathrm{S}_{\mathrm{N}} 2$ reaction. It involves inversion of configuration.

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