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Keto-enol tautomerism is observed in...

Keto-enol tautomerism is observed in

A

`C_(6)H_(5)-overset(O)overset(||)C-H`

B

`C_(6)H_(5)-overset(O)overset(||)C-CH_(3)`

C

`C_(6)H_(5)-overset(O)overset(||)C-C_(6)H_(5)`

D

`C_(6)H_(5)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CH_(3)`

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The correct Answer is:
B, D
Tautomerism is possible in the compounds which have `alpha-H` atom, i.e., (b) and (d)
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Assertion When pure d-1(+)-2 methlylbutanal is treated with diute H_(2)SO_(4) it is racemised completely. Reason It' s alpha carbon is chiral which undergo keto-enool tautomerism in the presence of acid catalyst.

CENGAGE CHEMISTRY-ISOMERISM-Multiple choice questions (Exercise)
  1. Which of the following statements regarding 1,3- dimethyl cyclobutane ...

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  2. Which of the following statements regarding 1,3- dimethl cyclobutane i...

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  3. Which of the following statements regarding 1,2-dimethyl cyclo-pentane...

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  4. The configuration of sugars is related to glyceraldehyde and that of a...

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  5. Which of the following statement are true?

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  6. Which of the following statements are correct?

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  7. Which of the following statements are wrong?

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  8. Which of the following statements are correct?

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  9. Which of the following satements are wrong?

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  10. Which of the following statements are correct?

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  11. Which of the following statements are correct?

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  12. Which of the following statements are wrong?

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  13. Only two isomeric monochloro derivatives are possible for

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  14. Keto-enol tautomerism is observed in

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  15. Which of the following has/have asymmetric carbon atom?

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  16. The molecule (s) that will have dipole moment is/are:

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  17. Which of the following compounds will show geometrical isomerism?

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  18. Tautomerism is exhibited by :

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  19. The correct statements (s) about the compound given below is/are:

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  20. In the Newman projection for 2,2- dimethylbutane X and Y can, res...

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