The formation of butane nitrile is possible in which of the following reactions?

Select the incorrect option:

Classify the following reactions into one of the reaction types studied in this unit:
$(a)$ $CH_3CH_2Br + HS^{-} \rightarrow CH_3CH_2SH + Br^{-}$
$(b)$ $(CH_3)_2C=CH_2 + HCl \rightarrow (CH_3)_2ClC-CH_3$
$(c)$ $CH_3CH_2Br + HO^{-} \rightarrow CH_2=CH_2 + H_2O + Br^{-}$
$(d)$ $(CH_3)_3C-CH_2OH + HBr \rightarrow (CH_3)_2CBr-CH_2CH_3 + H_2O$

$S_{N}2$ reaction involving inversion of configuration takes place with an optically active compound $Z$. The compound $Z$ is

Will $CCl_4$ give a white precipitate of $AgCl$ on heating it with silver nitrate? Give a reason for your answer.

Which of the following compounds will show retention in configuration on nucleophilic substitution by $OH^{-}$ ion?