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The reagent (s) which can be used to distinguishacetophenone from benzophenone is (are) [1990]
- a)2,4- Dinitrophenylhydrazine
- b)Aqueous solution of NaHSO3
- c)Benedict reagent
- d)I2and NaOH.
Correct answer is option 'D'. Can you explain this answer?
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The reagent (s) which can be used to distinguishacetophenone from benz...
I2 and NaOH react with acetophenone
(C6H5COCH3) to give yellow ppt. of CHI3 but benzophenone (C6H5COC6H5) does not and hence can be used to distinguish between them. Oxidation of methyl ketones with sodium Hypoiodite (NaOI) or (I2 +NaOH) gives iodoform (CHI3) but not in case of benzophenone.
(C6H5COCH3) to give yellow ppt. of CHI3 but benzophenone (C6H5COC6H5) does not and hence can be used to distinguish between them. Oxidation of methyl ketones with sodium Hypoiodite (NaOI) or (I2 +NaOH) gives iodoform (CHI3) but not in case of benzophenone.
Most Upvoted Answer
The reagent (s) which can be used to distinguishacetophenone from benz...
Reagents to distinguish acetophenone from benzophenone:
I2 and NaOH:
- Acetophenone reacts with I2 and NaOH to give a yellow precipitate of iodoform, while benzophenone does not undergo this reaction.
- The iodoform test is a qualitative test for methyl ketones, where the methyl ketone is oxidized by iodine in the presence of a base to form iodoform.
Explanation:
- Acetophenone has a methyl group attached to the carbonyl carbon, which can undergo oxidation by iodine in the presence of a base to form iodoform.
- Benzophenone does not have a methyl group attached to the carbonyl carbon, so it does not undergo the iodoform reaction.
- Therefore, by performing the iodoform test using I2 and NaOH, we can distinguish between acetophenone and benzophenone based on the formation of iodoform precipitate.
Overall:
- The use of I2 and NaOH as reagents helps in distinguishing acetophenone from benzophenone by the formation of iodoform precipitate in the case of acetophenone.
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The reagent (s) which can be used to distinguishacetophenone from benzophenone is (are) [1990]a)2,4- Dinitrophenylhydrazineb)Aqueous solution of NaHSO3c)Benedict reagentd)I2and NaOH.Correct answer is option 'D'. Can you explain this answer?
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