Name the reagent used to bring about the following conversion:

Ethyl bromide to ethyl isocyanide

Name the reagent used to bring about the following conversion:

Cholobenzene to biphenyl

Arrange the following in the increasing order of boiling points:

$\mathrm{a}.1$-Bromopropane
$\mathrm{b}. 2$- Bromopropane
$\mathrm{c}.1$- Bromobutane
$\mathrm{d}.1$-Bromo-$2$-methylpropane

Give reasons:

Haloarenes are less reactive than haloalkanes.

Give reasons:

Alkyl halides though polar are immiscible with water.

Give reasons:

Reactions involving Grignard reagent must be carried out under anhydrous condition.

Give reasons:

Alkyl halides are generally not prepared by free radical halogenation of alkane.