The given reaction is: $C_6H_5-CHO + C_6H_5-CHO \xrightarrow{Na_2[Fe(CO)_4]} C_6H_5-COOCH_2-C_6H_5$

Which of the following reactions will not result in the formation of carbon-carbon bonds?

Which of the following is $D$ in the given reaction sequence?
$(CH_3)_3C-CH_2OH$ $\xrightarrow{PCC} B$ $\xrightarrow{Conc. NaOH} A + C$ $\xrightarrow{NaOH/CaO, \Delta} D$

Which one of the following reactions does not represent the correct combination of substrate and product under the given conditions?

Identify the major product $(P)$ in the given reaction of propanal with dilute $NaOH$ followed by heating.

$p$-Cresol reacts with chloroform in an alkaline medium to give compound $A$,which on addition of hydrogen cyanide forms compound $Y$. Acidic hydrolysis of $Y$ yields a chiral carboxylic acid. What is the structure of the carboxylic acid?