Ethyl alcohol can be used in the preparation of which of the following?

Which of the following reagents cannot be used to oxidize primary alcohols to aldehydes?

Which of the following oxidation reactions can be carried out with chromic acid in aqueous acetone at $5 - 10^{\circ}C$?

The relative rate of acid-catalyzed dehydration of the following alcohols would be:

An alcohol $X$ $(C_4H_{10}O)$ on dehydration gives an alkene $(C_4H_8)$ as the major product,which on bromination followed by treatment with $Y$ gives an alkyne $C_4H_6$. The alkyne $C_4H_6$ does not react with sodium metal. What are $X$ and $Y$?

Tertiary butyl alcohol gives tertiary butyl chloride on treatment with