In which of the following reactions is a carbon$-$carbon bond $NOT$ formed during the formation of the product?

What is the product $E$ in the following reaction?

The product $(A)$ of the reaction is:

Choose the incorrect statement among the following.
$A$. The reactivity of aromatic aldehydes and ketones is less than that of aliphatic carbonyl compounds towards nucleophilic addition reactions.
$B$. Benzaldehyde does not give Fehling's test.
$C$. The $\alpha$-$H$ atoms in ethanal are acidic in nature.
$D$. $p$-nitro benzaldehyde is less reactive than benzaldehyde towards nucleophilic addition reactions.

Which of the following reactions is used to detect the presence of a carbonyl group?

In the following reaction,
$CH_3-C \equiv CH$ $\xrightarrow[H_3O^+]{Hg^{2+}} X$ $\xrightarrow[PhCHO]{dil. NaOH} Y$
$X$ and $Y$,respectively,are