An organic compound [A] having molecular formula forms a compound [B] with molecular formula on…

An organic compound [A] having molecular formula $\text{C}_4\text{H}_{10}\text{O}$ forms a compound [B] with molecular formula $\text{C}_4\text{H}_8\text{O}$ on oxidation. Compound [B] gives a positive iodoform test. The reaction of compound [B] with $\text{CH}_3\text{MgBr}$ followed by hydrolysis gives compound [C] with molecular formula $\text{C}_5\text{H}_{12}\text{O}$. Identify the compounds [A], [B] and [C]. Write the reaction for the conversion of compound [A] to compound [B].