The product $(B)$ in the following reaction is:

Predict the product of the following reaction:
$p-CH_3-C_6H_4-CHO + p-CH_3-C_6H_4-CO-CH_3 \xrightarrow{\bar{O}H, \Delta} \text{Product}$

Product $(D)$ in the above sequence is:

Which of the following is the correct order for the rate of nucleophilic addition of the given compounds?

Compound $P$ $(C_{8}H_{8}O)$ gives a red-orange precipitate with $2,4-DNP$ reagent and it does not reduce Fehling's reagent. On drastic oxidation with chromic acid, $P$ gives an aromatic product $Q$ that produces effervescence on treating with aqueous $NaHCO_{3}$. Compound $P$ and $Q$, respectively, are:

Which of the following will be most readily dehydrated in acidic conditions?