Question

Which one of the following solvents favors $E2$ reaction?

• A. 1 & 3
• B. 1 & 4
• C. 1 & 2
• D. 1, 2, 3 and 4

Answer 1

The correct option is A 1 & 3

Polar aprotic solvent favours $E2$ reaction because in polar aprotic solvent, the base remains unsolvated and it readily attacks the proton. Both DMSO and acetone are polar aprotic solvent hence, they favour $E2$ reaction.
Ethanol and water are polar protic solvent and hence both favours $E1$ reaction.