How the following conversion can be carried out?

Ethyl chloride to propanoic acid.

How the following conversion can be carried out?

But-$1$-ene to $\mathrm{n}$-butyliodide.

How the following conversion can be carried out?

$2$-Chloropropane to $1$-propanol.

How the following conversion can be carried out?

Isopropyl alcohol to iodoform

How the following conversion can be carried out?

Chlorobenzene to p-nitrophenol

How the following conversion can be carried out?

2-Bromopropane to 1-Bromopropane

How the following conversion can be carried out?

Chloroethane to butane

How the following conversions can be carried out?

Benzene to diphenyl

How the following conversion can be carried out?

Tert-butyl bromide to isobutyl bromide