Use two methods to convert$\mathrm{But}-2-\mathrm{yne}$ to $\left(\mathrm{Z}\right)-2-\mathrm{Deuterobut}- 2-\mathrm{ene}.$

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:

Dehydration of

gives a compound which exists in two isomeric forms. Give the structure of both the isomers.

Which ester on pyrolysis gives isobutylene?

Electrochemical oxidation of the succinate ion $(1, 4-\mathrm{butanedioate} \mathrm{ion})$ into ethylene proceeds through the formation of the intermediate

The major product is