Question

From the reactions shown, A and B respectively are:

• A. A: Hydrazine, KOH and heat; B: Zn-Hg HCl heat
• B. A: Zn-Hg HCl heat; B: cracking
• C. A: Zn-Hg HCl heat; B: aldol addition
• D. A: Hydrazine, KOH and heat; B: $(Ph{)}_{3}P=C{H}_2$

Answer 1

The correct option is D

A: Hydrazine, KOH and heat; B: $(Ph{)}_{3}P=C{H}_2$

A denotes the conversion of an aldehyde into a hydrocarbon.
Most suitable named reactions to get this done would be Wolff-Kishner reduction
or the Clemmensen reduction.