An organic compound [A] having molecular formula gives positive Lucas test within five minutes at…

An organic compound [A] having molecular formula $\text{C}_4\text{H}_{10}\text{O}$ gives positive Lucas test within five minutes at room temperature. Compound [A] upon oxidation with $\text{K}_2\text{Cr}_2\text{O}_7/\text{H}_2\text{SO}_4$ forms compound [B] which does not respond to Tollen’s test. Identify compounds [A] and [B].