Apologies I probably could of named the benzene containing molecule better what is it?

I was doing an exam question. Where there was a chloro methyl group attached to a Benzene ring as a cyanide ion was nucleophillically substituting with a chloro methyl group to form a nitrile bonded to a benzene ring.

Please can someone enlighten me as I have never seen both conditions before just one or the other. I have gooogled it but no sites talk about the conditions of nucleophilllic substitution with a cyanide ion in a benzene context. Does the benzene alter the conditions.

Thanks very much,

Daniel

I was doing an exam question where benzyl chloride was undergoing a nucleophilic substitution with cyanide ion to form benzyl cyanide.

Please can someone enlighten me as I have never seen both conditions before just one or the other. I have Googled it but no sites talk about the conditions of nucleophilic substitution with a cyanide ion in a benzene context. Does the benzene alter the conditions?