What is obtained when chlorine is passed into boiling toluene and the product is hydrolysed?

Among the following compounds $I-IV$,which one forms a yellow precipitate on reacting sequentially with $(i)$ $NaOH$,$(ii)$ dil. $HNO_{3}$,and $(iii)$ $AgNO_{3}$?

What is the correct order of reactivity of alkyl halides towards dehydrohalogenation?

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

The one giving the maximum number of isomeric alkenes on dehydrohalogenation reaction is (excluding rearrangement):

$AgNO_3$ does not give a precipitate with $CHCl_3$ because