Which among the following methods is $NOT$ suitable for the preparation of alkyl chlorides?

The major product in the following reaction sequence is:

Identify the reactions that are correctly matched with their major product.

Grignard reagent is prepared by the reaction between

$RCOOAg + Br_2 \xrightarrow[\Delta ]{CCl_4} R - Br + AgBr + CO_2$. This reaction is called

Which one of the following reactions would be the best for the formation of $2-$bromobutane?
$(1)$ $CH_3CH=CHCH_2CH_3$ $\xrightarrow{HBr}$
$(2)$ $CH_3CH_2CH=CH_2$ $\xrightarrow{HBr}$
$(3)$ $CH_3CH=CHCH_3$ $\xrightarrow{Br_2}$
$(4)$ $CH_3CH_2CH=CH_2$ $\xrightarrow[Peroxide]{HBr}$