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What is the action of following reagents on pent-3-enal? H2/Ni LiAlH4/H3O+ - Chemistry

Short Note

What is the action of following reagents on pent-3-enal?

  1. H2/Ni
  2. LiAlH4/H3O+
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Solution

Pent-3-enal contains an isolated > C = C < and an aldehyde group. H2/Ni can reduce both these functional groups while LiAlH4 can reduce only –CHO of the two.

  1. H2/Ni:
    \[\ce{\underset{\text{Pent-3-enal}}{CH3 - CH = CH - CH2 - CHO} ->[H2/Ni]\underset{\text{Pentan-1-ol}}{CH3 - CH2 - CH2 - CH2 - CH2 - OH}}\]
  2. LiAlH4/H3O+:
    \[\ce{\underset{\text{Pent-3-enal}}{CH3 - CH = CH - CH2 - CHO} ->[(i)LiAIH4][(ii)H3O+] \underset{\text{Pent-3-en-1-ol}}{CH3 - CH = CH - CH2 - CH2 - OH}}\]
Concept: Alcohols and Phenols
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APPEARS IN

SCERT Maharashtra Question Bank 12th Standard HSC Chemistry Maharashtra State Board 2021
Chapter 11 Alcohols, Phenols and Ethers
Short Answer Questions (Type-Ⅰ) | Q 1
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