Question

Which of the following reagents converts acid chloride to aldehyde selectively?

• A. \(\text{LiAlH}_{4}\)
• B. \(\text{H}_{2}\)/Pt
• C. \(\text{H}_{2}\)/Pd-\(\text{BaSO}_{4}\)
• D. \(\text{NaBH}_{4}\)

Hint:

Rosenmund reduction uses poisoned palladium on barium sulphate.

Answer 1

The Correct Option is C

Step 1: Recall the name reaction
Acid chloride to aldehyde is Rosenmund reduction.

Step 2: Match with options
Only option (C) contains the poisoned Pd-$\text{BaSO}_{4}$ catalyst. The others over-reduce the aldehyde.

Step 3: Final Check
The poison keeps the catalyst weak so the aldehyde is not reduced further. This confirms option (C).

Final Answer:
Option (C) is correct. \[ \boxed{\text{(C) }\text{H}_{2}\text{/Pd-BaSO}_{4}} \]