Select the reagent that will yield the greater amount of substitution on reaction with $CH_3CH_2Br$.

Consider the following reaction. Which of the following bases will give the best yield of the alkene $(II)$ as the major product?

The correct decreasing order of $SN^2$ reactivity of the following alkyl halides is:
$(I)$ $CH_2=CH-Br$
$(II)$ $CH_3-Br$
$(III)$ $CH_3-CH(Br)-CH_3$
$(IV)$ $CH_3-CH_2-Br$

An alkyl bromide reacts with sodium ethoxide and ethanol to give only one alkene. Hydrogenation of this alkene yields $2-$methylbutane. What is the alkyl halide?

How do polar solvents help in the first step in $S_{N}1$ mechanism?

Two isomers $(A)$ and $(B)$ with molar mass $184 \ g/mol$ and elemental composition $C, 52.2 \ \%; H, 4.9 \ \%$ and $Br, 42.9 \ \%$ give benzoic acid and $p$-bromobenzoic acid,respectively,on oxidation with $KMnO_4$. Isomer '$A$' is optically active and gives a pale yellow precipitate when warmed with alcoholic $AgNO_3$. Isomer '$A$' and '$B$' are,respectively .... .