The relation between $K_1$ and $K_2$ for the given equilibrium reactions is:

$P \xrightarrow{H_2 / Pd-BaSO_4} Q \xrightarrow{(i) \text{ conc. } NaOH} R + S$. $R$ and $S$ form benzyl benzoate when treated with each other. Hence,$P$ is

Write a note on the preparation of secondary alcohols from ketones by reduction reaction.

The iodoform test can differentiate between:
$A$. Methanol and Ethanol
$B$. $CH_3COOH$ and $CH_3CH_2COOH$
$C$. Cyclohexene and cyclohexanone
$D$. Diethyl ether and Pentan$-3-$one
$E$. Anisole and acetone
Choose the correct answer from the options given below:

An ester $(A)$ with molecular formula $C_9H_{10}O_2$ was treated with excess of $CH_3MgBr$ and the complex so formed was treated with $H_2SO_4$ to give an olefin $(B)$. Ozonolysis of $(B)$ gave a ketone with molecular formula $C_8H_8O$ which shows positive iodoform test. The structure of $(A)$ is

Identify the name of the reaction in which the carbonyl group of aldehydes and ketones is reduced to a methylene group upon treatment with hydrazine,followed by heating with sodium hydroxide in ethylene glycol.