Which one of the following is an acetal?

Explain the mechanism of nucleophilic addition reactions of aldehyde and ketone compounds.

The major product of the following reaction sequence is

The final product $(C)$ in the given reaction sequence is
$C_6H_5COOH$ $\xrightarrow{SOCl_2} (A)$ $\xrightarrow[\text{anhy. } AlCl_3]{C_6H_6} (B)$ $\xrightarrow[\text{(ii) } KOH / (CH_2OH)_2]{\text{(i) } NH_2-NH_2} (C)$

Write about the oxidation reaction of methyl ketone compounds $(R-CO-CH_3)$ by the haloform reaction or write a note on the Haloform test.

Upon treatment with $I_{2}$ and aqueous $NaOH$, which of the following compounds will form iodoform?