Which of the following is responsible for the depletion of the ozone layer in the upper stratosphere of the atmosphere?

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: The presence of nitro group facilitates nucleophilic substitution reaction in aryl halides.

Reason: The intermediate carbanion is stabilized due to the presence of nitro group.

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.