Aldehyde And Ketone

Identify product '\(B\)' in following sequence of reactions.

2n Propanone \(\mathrm{\buildrel {Ba{{(OH)}_2}} \over \longrightarrow}\) A \(\mathrm{\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{ - {H_2}O}^\Delta }}\) nB