Denatured spirit is mainly used as a

The compound which gives the most stable carbocation on dehydration is:

What are $X$ and $Y$ in the following reactions?

$A$ compound $X$ with the molecular formula $C_3H_8O$ yields a compound with the formula $C_3H_6O$ upon oxidation. To which of the following classes of compounds could $X$ belong?

Suggest the reagent for conversion of ethanol to ethanoic acid.

Which of the following alcohols cannot be prepared by the reaction of an acid chloride with an excess of a Grignard reagent followed by acidification?