Directions: Each of these questions contain an assertion followed by reason. Read them carefully and answer the question on the basis of the following options. You have to select the one that best describes the two statements.

Assertion: $p$-bromo nitrobenzene reacts with sodium hydroxide solution more readily than bromobenzene.
Reason: Nitro group present at the para position stabilises the intermediate carbanion by resonance.

Directions: Each of these questions contains an Assertion followed by reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.

Assertion: Grignard reagent can not be prepared in non-polar solvent.

Reason: Diethyl ether do not solvate the Grignard reagent.

Directions: Each of these questions contains an Assertion followed by reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.

Assertion: ${\mathrm{CH}}_3\mathrm{MgBr}$ is prepared in cold aqueous solution.

Reason: Water molecule stabilise Grignard reagent by $\mathrm{H}$-bonding.

Which one is a nucleophilic substitution reaction among the following?