Which of the following is incorrectly matched?
(Formation of) (Best synthesis by)

Which reagent is useful in converting $1$-butanol to $1$-bromobutane?

Identify the name of the reaction in which alkyl fluorides are prepared by heating alkyl bromide or alkyl chloride with metallic fluorides like $AgF$,$Hg_2F_2$,$CoF_2$,or $SbF_3$.

The major product in the following reaction sequence is:

Which of the following sequence of reactions (reagents) can be used for the conversion of $C_6H_5CH_2CH_3$ into $C_6H_5CH=CH_2$?

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