What is not present in a Grignard reagent?

The major product $(A)$ of the following reaction is:

$S_{N}2$ reaction involving inversion of configuration takes place with an optically active compound $Z$. The compound $Z$ is

Arrange the following compounds in order of decreasing rate of hydrolysis for $S_N1$ reaction:
$(i)$ $C_6H_5CH_2Br$
(ii) $p-CH_3-C_6H_4-CH_2Br$
(iii) $p-CH_3CH_2-C_6H_4-CH_2Br$
(iv) $p-(CH_3)_2CH-C_6H_4-CH_2Br$

Identify the products of the given reactions.

Chlorination of toluene in the presence of light and heat followed by reaction with aqueous $NaOH$ gives ...................