Question

Aldehydes and Ketones can be converted to alkanes using
(A). LiAlH\({}_{4}\)/ H\({}_{3}\)O\({}^{+}\)
(B). Zn-Hg/ conc\({}^{n}\) HCl
(C). NH\({}_{2}\)-NH\({}_{2}\) / KOH in ethylene glycol
(D). K\({}_{2}\)Cr\({}_{2}\)O\({}_{7}\)/ dil.H\({}_{2}\)SO\({}_{4}\)

• A. (A), (B) and (D) only.
• B. (A) and (C) only.
• C. (B) and (C) only.
• D. (A), (C) and (D) only.

Hint:

Clemmensen and Wolff-Kishner reductions remove the carbonyl oxygen completely.

Answer 1

The Correct Option is C

Step 1: Formula-first Approach
The two named reductions are Clemmensen (acidic) and Wolff-Kishner (basic).

Step 2: Compare the options
These are reagents (B) and (C). Any option that includes (A) or (D) is wrong, because (A) stops at the alcohol and (D) oxidises.

Step 3: Conclusion
So the answer is (B) and (C) only.

Final Answer:
The correct choice is (B) and (C) only. \[ \boxed{\text{(C) }\text{(B) and (C) only}} \]