For each of the following reactions, indicate whether elimination will occur via an $\mathrm{E}2$ or an $\mathrm{E}1$ reaction. Give the major product in each case.

For each of the following reactions, indicate whether elimination will occur via an $\mathrm{E}2$ or an $\mathrm{E}1$reaction. Give the major product in each case.

\

For each of the following reactions, indicate whether
elimination will occur via an $\mathrm{E}2$ or an $\mathrm{E}1$ reaction. Give
the major product in each case.

Propose mechanism for each of the following reactions.

Propose mechanism for each of the following reactions.

Which reaction gives $2,3-\mathrm{Dimethylbut}-\mathrm{l}-\mathrm{ene}$ in the better yield

(a) Dehydration of $2,3-\mathrm{Dimethybutan}-\mathrm{l}-\mathrm{ol}$ in acidic medium and

(b) Dehydrohalogenation of$2, 3-$dimethyl$-1-$bromo butane with alkaline $\mathrm{KOH}$. Explain.

Identify the products of the following reactions:

Identify the products of the following reactions: