The end product $B$ in the sequence of reactions: $R - X$ $\xrightarrow{KCN} A$ $\xrightarrow[H_2O]{NaOH} B$ is

The correct set$(s)$ of reactions to synthesize benzoic acid starting from benzene is/are:

Compare the two methods shown for the preparation of carboxylic acids.
Method $1$: $RBr$ $\xrightarrow[diethyl \ ether]{Mg} RMgBr$ $\xrightarrow[2. \ H_3O^{+}]{1. \ CO_2} RCO_2H$
Method $2$: $RBr$ $\xrightarrow{NaCN} RCN$ $\xrightarrow[heat]{H_2O, HCl} RCO_2H$
Which one of the following statements correctly describes this conversion for the given substrate ($1$-bromoadamantane)?

Which of the following is a laboratory method for the preparation of acetyl chloride?

Toluene can be oxidised to benzoic acid by

In the reaction $CH_3CN \xrightarrow{H_3O^+, \text{heat}} CH_3COOH$,what is the change in the hybridization state of the functional carbon atom?