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What happens when an aldehyde is treated with lithium aluminium hydride?
  • a)
    Primary alcohol is formed
  • b)
    Secondary alcohol is formed
  • c)
    Tertiary alcohol is formed
  • d)
    No reaction
Correct answer is option 'A'. Can you explain this answer?
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What happens when an aldehyde is treated with lithium aluminium hydrid...
Reaction of Aldehyde with Lithium Aluminium Hydride:
When an aldehyde is treated with lithium aluminium hydride (LiAlH4), a reduction reaction takes place. This reaction is a nucleophilic addition reaction that results in the formation of a primary alcohol.

Steps of the Reaction:
- Lithium aluminium hydride acts as a strong reducing agent.
- The hydride ion (H-) from LiAlH4 attacks the electrophilic carbon in the carbonyl group of the aldehyde.
- This nucleophilic addition leads to the formation of an alkoxide intermediate.
- The alkoxide intermediate then undergoes a protonation step to yield the primary alcohol as the final product.

Key Points:
- The reduction of an aldehyde with lithium aluminium hydride results in the formation of a primary alcohol.
- This reaction is a useful method for synthesizing primary alcohols from aldehydes.
- The mechanism involves nucleophilic addition and protonation steps.
- The overall reaction can be represented as follows:
RCHO + LiAlH4 → RCH2OH
Therefore, when an aldehyde is treated with lithium aluminium hydride, the primary alcohol is formed as the end product.
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Community Answer
What happens when an aldehyde is treated with lithium aluminium hydrid...
LiAlH4 acts as a reducing agent which reduces an aldehyde by adding hydrogen atoms to it result in the formation of a primary alcohol.
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What happens when an aldehyde is treated with lithium aluminium hydride?a)Primary alcohol is formedb)Secondary alcohol is formedc)Tertiary alcohol is formedd)No reactionCorrect answer is option 'A'. Can you explain this answer?
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