MHT CET Medical202626 April 2026Morning ShiftChemistryHydrocarbonsActual
Aldehydes and Ketones can be converted to alkanes using (A). LiAlH₄ / H₃ O ^+ (B). Zn-Hg/ conc ^n HCl (C). NH₂ -NH₂ / KOH in ethylene glycol (D). K₂ Cr₂ O₇ / dil.H₂ SO₄
Options
- A(A), (B) and (D) only.
- B(A) and (C) only.
- C(B) and (C) only.
- D(A), (C) and (D) only.
Correct answer
C. (B) and (C) only.
Step-by-step solution
Aldehydes and ketones can be reduced to alkanes by Clemmensen reduction and Wolff-Kishner reduction. In Clemmensen reduction, the carbonyl group is reduced to a methylene group using zinc amalgam and concentrated hydrochloric acid (Zn-Hg / conc. HCl). In Wolff-Kishner reduction, the carbonyl group is reduced to a methylene group using hydrazine followed by heating with sodium or potassium hydroxide in a high boiling solvent such as ethylene glycol (NH₂ -NH₂ / KOH in ethylene glycol). LiAlH₄ reduces aldehydes and ke