Structure of compounds A, B and C in the above reaction sequence are:

Acetone reacts with Grignard reagent followed by hydrolysis to form 2-Methylpropane-2-ol.

2-Methylpropane-2-ol then reacts with sodium metal in the presence of ether to form sodium tert-butoxide.

Sodium tert-butoxide is then allowed to react with CH₃-Br to produce 2-Methyl-2-methoxypropane. This is called Williamson’s synthesis of ether.