Alkyl halide is converted into alkyl isocyanide by reaction with

Arrange the following in order of ease of dehydrohalogenation:
$(i)$ Bromocyclohexane
(ii) $3-$Bromocyclohexene
(iii) $3-$Bromocyclohexa$-1,4-$diene
(iv) Bromobenzene

Which is the main organic product obtained by the reaction of $2,2,2-$trichloroethanol with calcium hydroxide?

The major product of the following reaction is $CH_3-CH(CH_3)-CH(Br)-CH_3 \xrightarrow{CH_3OH}$

The correct description of the product in the following reaction is:
$CH_3-CH(Br)-CH_2OCH_3 \text{ } ((R)) \xrightarrow{NaCN, \text{acetone}} CH_3-CH(CN)-CH_2OCH_3$

On monochlorination of $2-$methylbutane,the total number of chiral compounds is