Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options given.

(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)

The correct answer is option 1. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii).

Let us break down the matching of each compound to its correct description:

1. \(CH_3—OH\):ii. Methyl alcohol

This is Methanol, commonly known as Methyl alcohol. It has a single hydroxyl group attached to a carbon atom, making it the simplest alcohol.

2. \(CH_3CH_2—OH\): iv. Ethyl alcohol

This is Ethanol, commonly known as Ethyl alcohol. It has an ethyl group \((CH_3CH_2)\) attached to a hydroxyl group.

3. \(H_2C=CH—CH_2—OH\): i. Allyl alcohol

This compound is Allyl alcohol. It contains an allylic hydroxyl group, where the hydroxyl group is attached to a carbon that is adjacent to a double bond (allylic position).

4. \(HC≡C—CH_2—OH\): iii. Propyl alcohol

This is Propargyl alcohol. It has a hydroxyl group attached to a propargylic carbon, which is next to a carbon-carbon triple bond.

By matching these structures and their names, we can confidently say the correct option is: 1.(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)