In the above reaction,the major product '$P$' is:

Which of the following undergoes $S_{N^{1}}$ reaction?

Predict the order of reactivity of the following four isomers towards $S_{N}2$ reaction.
$(I)$ $CH_{3}CH_{2}CH_{2}CH_{2}Cl$
$(II)$ $CH_{3}CH_{2}CH(Cl)CH_{3}$
$(III)$ $(CH_{3})_{2}CHCH_{2}Cl$
$(IV)$ $(CH_{3})_{3}CCl$

The order of reactivity of alkyl halides for dehydrohalogenation is:

For the following reaction,the yield of the product is highest in:
$CH_3-Br + NaOH \to CH_3-OH + NaBr$

$A$ solution of $(+)-1$-chloro-$1$-phenylethane in toluene racemizes slowly in the presence of a small amount of $SbCl_5$ due to the formation of which of the following?