Meaning of ammonolysis

Ammonolysis is a reaction in which a compound reacts with ammonia $\left(NH_3\right)$ and a group is replaced by an amino group.

In organic chemistry, a common example is: $R-X + NH_3 \rightarrow R-NH_2$ where $X$ is a leaving group such as halogen.

Check each option

Option A: $C_6H_5COCl + C_6H_5NH_2 \rightarrow C_6H_5CONHC_6H_5$ This is reaction of an acid chloride with aniline to form an amide. It is amidation/acylation, not ammonolysis.

Option B: $C_6H_5CH_2CN \xrightarrow{[H]} C_6H_5CH_2CH_2NH_2$ This is reduction of nitrile to a primary amine. It is not ammonolysis.

Option C: $C_6H_5CH_2CN \xrightarrow{HCl} C_6H_5\overset{+}{N}H_3Cl^-$ This corresponds to formation of an amine salt under acidic conditions, not reaction with ammonia replacing a leaving group. So this is not ammonolysis.

Option D: $C_6H_5CH_2Cl + NH_3 \rightarrow C_6H_5CH_2NH_2$ Here benzyl chloride reacts with ammonia, and $Cl$ is replaced by $NH_2$. This is the standard example of ammonolysis.

Conclusion

The correct option is: $\boxed{D}$

Comparison with stored answer

Stored correct answer: $D$

My derived answer is also $D$, so they agree.