An organic compound (A) (molecular formula (C₈H₁₆O₂) gives a carboxylic acid (B) upon hydrolysis by dilute sulphuric acid and an alcohol (C). Oxidation of(C) with chromic acid produces(B). (C) on dehydration gives but-1-ene. Compound B is:

Phthalic acid on heating with SOCl₂  gives:

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

1.		2.
3.		4.	None of these