MHT CET 202626 AprilMorning Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 26 April
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Hydrocarbons
MHT CET 2026 · 26 April · Morning Shift · Chemistry · Hydrocarbons
Aldehydes and Ketones can be converted to alkanes using (A)....
Aldehydes and Ketones can be converted to alkanes using
(A). LiAlH_4 O^+ HCl
(C). NH_2 / KOH in ethylene glycol
(D). K_2 O_7 SO_4
(A). LiAlH_4 O^+ HCl
(C). NH_2 / KOH in ethylene glycol
(D). K_2 O_7 SO_4
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 (NH_2 / KOH in ethylene glycol).
LiAlH_4 Cr_2 is an oxidizing agent and oxidizes aldehydes to carboxylic acids.
Thus, only (B) and (C) are correct.
Answer: (B) and (C) only.
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 (NH_2 / KOH in ethylene glycol).
LiAlH_4 Cr_2 is an oxidizing agent and oxidizes aldehydes to carboxylic acids.
Thus, only (B) and (C) are correct.
Answer: (B) and (C) only.