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Aldehydes that do not undergo aldol cond...

Aldehydes that do not undergo aldol condensation are
1. propanal 2. trichloroethanal
3. methanal 4. ethanal
5. benzaldehyde

A

3 and 4 only

B

3 and 5 only

C

1, 2 and 3 only

D

2, 3 and 5 only

Text Solution

Verified by Experts

The correct Answer is:
D
The carbonyl compounds must contain an `alpha`-hydrogen atom to undergo aldol condensation. Thus, propanal and ethanal are the aldehydes that can undergo aldol condensation.
However, methanal though does not contain `alpha`-hydrogen atom yet undergoes cross aldol codensation in the presence of limewater.
Thus, aldehydes that do not undergo aldol condensation are trichloroethanal, benzaldehyde and methanal.
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Knowledge Check

  • Which of the following compounds do not undergo aldol condensation?

    A
    `CH_3-CHO`
    B
    C
    `CH_3-overset(O)overset(||)C-CH_3`
    D
    `CH_3-underset(CH_3)underset(|)overset(CH_3)overset(|)C-CHO`

  • Identify the combination of compounds that undergo aldol condensation followed by dehydration to produce but-2-enal

    A
    a) methanal and ethanal
    B
    b) two moles of ethanal
    C
    c) methanal and propanone
    D
    d) ethanal and propanone

  • Which compound among the following give/s positive iodoform test ? 1. Ethanol 2. Ethanal 3. 1-butanol 4. 2-butanol 5. Phenyl ethanal

    A
    1, 2 and 5
    B
    1, 3 and 4
    C
    1, 2 and 3
    D
    1, 2 and 4

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