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Aldehydes that do not undergo aldol cond...

Aldehydes that do not undergo aldol condensation are
(1) propanal (2) trichloroethanal (3) 2- phenylethanal (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 compound must contain an `alpha`-hydrogen atom, for it to undergo aldol condensation. However, formaldehyde, though contains no `alpha`-hydrogen atom yet undergoes abnormal aldol condensation in presence of lime water.
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ERRORLESS-ALDEHYDES AND KETONES-NCERT BASED QUESTIONS(PROPERTIES OF ALDEHYDES AND KETONES)
  1. With which of the following reagents, carbonyl compound shows addition...

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  2. The product of this reaction is

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  3. Aldehydes that do not undergo aldol condensation are (1) propanal (...

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  4. Anils are formed by the condensation of aniline with

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  5. An organic compound 'A' burns with a sooty flame. It is negative towar...

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  6. Which of the follwing compound does not react with concentrated alkali...

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  7. An organic compound 'X' is oxidised by using acidified K(2)Cr(2)O(7). ...

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  8. Which of the following will fail to react with potassium dichromate an...

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  9. Aldehyde and ketones can decolourise

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  10. CH-=CH underset("dil. "H2SO4)overset(HgSO4)to A underset(NaOH)overset(...

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  11. The key step in cannizzaro's reaction is the intermolecular shift of

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  12. In which of the following reactions, the product obtained is chiral ?

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  13. One of the following named reaction is an example of "disproportionati...

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  14. Which of the following reactions will not result in the formation of c...

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  15. Ethylene is converted to X on passing through a mixture of acidified a...

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  16. PCI5 reacts with propanone, to give

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  17. Predict the product

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  18. The compound that neither forms semicarbazone nor oxime is

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  19. The most stabl enol tautomer of MeCOCH(2)CO(2)Et is

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  20. Which of the following will form two isomers with semi carbazide

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