Which of the following compounds will not give a precipitate with $AgNO_3$?

What is the product formed when chloroform reacts with zinc dust in the presence of water?

For $(i) \, I^{-}, \, (ii) \, Cl^{-}, \, (iii) \, Br^{-}$,the increasing order of nucleophilicity would be

The reactivity of alkyl bromides towards iodide ion in dry acetone decreases in the order:
$I. CH_3CH_2Br$
$II. CH_3-CH(CH_3)-Br$
$III. CH_3-C(CH_3)_2-Br$
$IV. CH_3Br$

For the following compounds,the correct statement$(s)$ with respect to nucleophilic substitution reactions is(are):
$I$: Benzyl bromide $(C_6H_5CH_2Br)$
$II$: Cyclohexylmethyl bromide $(C_6H_{11}CH_2Br)$
$III$: tert-Butyl bromide $((CH_3)_3CBr)$
$IV$: $1-$Phenylethyl bromide $(C_6H_5CH(CH_3)Br)$
$A$. $I$ and $III$ follow $S_{N}1$ mechanism
$B$. $I$ and $II$ follow $S_{N}2$ mechanism
$C$. Compound $IV$ undergoes inversion of configuration
$D$. The order of reactivity for $I$,$III$ and $IV$ is: $IV > I > III$

By passing excess $Cl_{2(g)}$ in boiling toluene,which one of the following compounds is exclusively formed?