Above reaction is known as:

Rosenmund Reaction

The correct answer is option 3. Rosenmund Reaction.

Acid chlorides can be reduced to aldehydes when hydrogenated in the presence of a catalyst such as palladium deposited on barium sulphate. A catalyst poison like quinoline or pyridine and sulphur is frequently added to moderate the activity of the catalyst and to prevent further reduction of the product aldehyde into alcohol.

This reaction is known as Rosenmund Reduction.

Mechanism: Rosenmund reduction is believed to involve hydrogenation of carbonyl group, followed by elimination of HCl as follows: