Organic compound (A), having molecular formula C₈H₁₆O₂, on hydrolysis with dilute H₂SO₄ gives a carboxylic acid (B) and an alcohol (C). Oxidation of alcohol (C) with chromic acid gives the same carboxylic acid (B). On dehydration, alcohol (C) gives but-1-ene.

Identify compound (B).

Phthalic acid on heating with SOCl₂  gives:

The structure of Hex-2-en-4-ynoic acid is:

1.
2.
3.
4.	None of these