The carbonyl compound that does not undergo aldol condensation is

Consider the above reaction,the major product $'P'$ is:-

$p$-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?

$RCH=O + H_2 \xrightarrow{\text{catalyst}} RCH_2OH$. Which catalyst is used for this reaction?

$\underset{\text{symmetrical Ketone}}{(A)}\,$ $\xrightarrow{LiAlH_{4}}(B)$ $\xrightarrow[\Delta ]{H^{\oplus }}\text{Diastereomers}$
Reactant $(A)$ is

Which statement about the aldol condensation is correct?