How many of the given solvents favour $E 2$ mechanism?
(i) DMSO (ii) Ethanol (iii) Acetone (iv) Water

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Solution

Polar aprotic solvent favours $E 2$ 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 $E 2$ reaction.
Ethanol and water are polar protic solvent and hence both favours $E 1$ reaction.

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