In the reaction,$C_6H_5COCH_3 \xrightarrow[Zn-Hg / \text{conc. } HCl]{[H]} X$,$X$ is

When two molecules of acetaldehyde condense in the presence of dilute alkali,it forms

In Wolff-Kishner reduction,the carbonyl group of aldehydes and ketones is converted into

What will be the compound $X$ in the given reaction?
$MeO-C_6H_4-CHO + (X) \xrightarrow{CH_3COONa, H_3O^+} MeO-C_6H_4-CH=CHCOOH$

What is the product obtained in the reaction of acetaldehyde with semicarbazide?

In a set of reactions,an acid yielded a product $D$.
$CH_3COOH$ $\xrightarrow{SOCl_2} A$ $\xrightarrow[Anhyd. AlCl_3]{Benzene} B$ $\xrightarrow{HCN} C$ $\xrightarrow{H_3O^+} D$
Identify the product $D$.