Identify the major product in the following reaction.

Which of the following compounds does not undergo nucleophilic substitution reactions?

Which of the following reagents is used to prepare alkyl isocyanides from alkyl halides $(RX)$?

Which is the most reactive halide towards $S_{N^1}$ reaction?

For the following reactions:
$CH_{3}CH_{2}CH_{2}Br + Z^{-} \xrightarrow[substitution]{k_s} CH_{3}CH_{2}CH_{2}Z + Br^{-}$
$CH_{3}CH_{2}CH_{2}Br + Z^{-} \xrightarrow[elimination]{k_e} CH_{3}CH=CH_{2} + HZ + Br^{-}$
where
$Z^{-} = CH_{3}CH_{2}O^{-} (A)$ or $(CH_{3})_{3}CO^{-} (B)$
$k_s$ and $k_e$ are,respectively,the rate constants for the substitution and elimination,and $\mu = \frac{k_s}{k_e}$,the correct option is:

What is the major product obtained in the reaction of $1-$phenyl$-2-$bromobutane with $NaOMe$?