What is formed when benzaldehyde reacts with chlorine in the absence of a catalyst?

You have two $C_6H_{10}O$ ketones,$I$ and $II$. Both are optically active,but $I$ is racemized by treatment with acid and $II$ is not. Wolff-Kishner reduction of both ketones gives the same achiral hydrocarbon,formula $C_6H_{12}$. What reasonable structures may be assigned to $I$ and $II$ respectively?

$2CH_3COCH_3 \xrightarrow{Mg/Hg, H^{+}} \text{Product}$,the product in the reaction is:

Which one of the following reactions is a method for the conversion of a ketone into a hydrocarbon?

Aldol condensation of acetaldehyde involves the formation of which of the following intermediates?

Benzaldehyde and acetone can be best distinguished using