Acetaldehyde when treated with dilute $NaOH$ gives:

What is the product formed when propanal reacts with dilute sodium hydroxide?

What are $X$,$Y$,and $Z$ in the following reaction sequence respectively?
Benzene $\xrightarrow{X}$ Benzaldehyde $\xrightarrow{\text{Conc. NaOH}, \Delta} Y + Z$

How many aldol products (excluding stereoisomers) are obtained in the given reaction?
$CH_3-CH_2-CHO + C_6H_5CHO \xrightarrow[0-5 \ ^{\circ}C]{OH^{\ominus}} ?$

$Propyne$ $\xrightarrow[Hg^{2+} / H_2 O, \Delta]{H^{+}}$ $P$ $\stackrel{Ba(OH)_2}{\rightleftharpoons}$ $Q$ $\xrightarrow{\Delta}$ $R$. $R$ in the above sequence of reactions is:

Write a note on the electrophilic substitution reaction of aromatic aldehydes and ketones.