Reagent that converts benzonitrile into benzophenone

The same question, asked 2 times: 11 May 2023 S1, 18 Apr 2026 S1. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
11 May 2023 S1
57 $Identify reagent used for preparation of benzophenone from benzonitrile?$
Tap an option to check your answer.
Question 2
18 Apr 2026 S1
41 $Benzonitrile on reaction with a reagent in dry ether followed by hydrolysis forms benzophenone along with ammonia and hydroxymagnesium bromide. Identify the reagent used in above transformation.$
Tap an option to check your answer.