When ethyl iodide is heated with silver nitrite,the product obtained is:

Which chlorine atom is more electronegative in the following compounds?

Predict the order of reactivity of the following compounds in $S_N1$ reaction.
$(I)$ $C_6H_5-CH_2Br$
$(II)$ $C_6H_5-CH(C_6H_5)Br$
$(III)$ $C_6H_5-CH(CH_3)Br$
$(IV)$ $C_6H_5-C(CH_3)(C_6H_5)Br$

The major product obtained in the following reaction is $C_2H_5ONa + (CH_3)_3C-Cl \rightarrow$

The correct order for increasing reactivity towards $S_N1$ substitution for the following compounds is:
$1. CH_3CH_2Br$
$2. CH_2=CHCH(Br)CH_3$
$3. CH_2=CHBr$
$4. CH_3CH(Br)CH_3$

The maximum number of $RBr$ isomers producing $2-$methylbutane by the given sequence of reactions is $...........$ $(Consider the structural isomers only)$