Identify the pair of compounds which can be distinguished by the iodoform test.

Which one of the following reactions can be used for the preparation of $\beta$-hydroxy acid derivatives?

What is the characteristic odor of nitrobenzene?

Identify 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.

Select the reaction with the correct major product.

In the following reaction sequence, the amount of $D$ (in $g$) formed from $10$ moles of acetophenone is. . . . . . (Atomic weights in $g \ mol^{-1}: H = 1, C = 12, N = 14, O = 16, Br = 80$. The yield (%) corresponding to the product in each step is given in the parenthesis)