Question

Which of the following reaction conditions is not appropriate for the following
transformation ?
co
?
(a) Zn(Hg)/HCI
(b) NH2NH2/NaOH
(C) LiAlH4/Et20
(d) HSCH2CH2CH2SH/H+ then Hz/Ni​

Answer 1

Answer:

Zn(Hg)/HCI

Explanation:

ANSWER

In this reaction, a CO group is converted to CH²

group. This can be achieved by Wolff-Kishner reduction which uses reagent NH²NH²,OH-

(hydrazine in alkaline medium).

Clemmensen reduction (Zn(Hg)/HCl) cannot be used as in presence of HCl, the alcohol may undergo dehydration.

Answer 2

The correct answer is option (a). Zn(Hg)/HCI.

• Because alcohol dehydrates in the presence of HCl in Zn(Hg)/HCl or Clemmensen reduction, it cannot be used as a suitable transformation reagent in this case.
• The CO group is converted to the $CH_2$ group in this reaction.
• The Wolff-Kishner reduction reaction is the name given to this kind of chemical reaction.
• In the Wolff-Kishner reduction, $NH_2-NH_2$ and KOH in ethylene glycol are the main reagents employed.
• In the Wolff-Kishner reduction reaction, carbonyl molecules are converted into alcohols or hydrocarbons.
• This kind of reduction reaction occurs when a strong base and extra hydrazine are heated together.
• The carbonyl compounds can be easily reduced to alkanes using the Wolff-Kishner reduction reaction because they are stable under strongly basic conditions.

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