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प्रश्न
Carboxylic acids contain carbonyl group but do not show the nucleophilic addition reaction like aldehydes or ketones. Why?
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उत्तर
It is due to resonance as shown below. The partial positive charge on the carbonyl carbon atom is reduced

Similarly, a carbonyl group of aldehydes and ketones may be regarded as the resonance hybrid of the following structures.

The carbonyl carbon of carboxylic group is less electrophilic than carbonyl carbon in aldehydes and ketones and hence nucleophilic addition reactions of aldehydes and ketones do not takes place with carboxylic acids.
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संबंधित प्रश्न
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(A) Ammonia
(B) Hydroxylamine
(C) Ammoniacal silver nitrate
(D) Semicarbazide
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Hint: Consider steric effect and electronic effect.
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Predict the product of the following reaction:

What is meant by the following term? Give an example of the reaction in the following case.
Oxime
What is meant by the following term? Give an example of the reaction in the following case.
Imine
What is meant by the following term? Give an example of the reaction in the following case.
Schiff’s base
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2) `PCl_3 , "heat"`
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Give a simple chemical test to distinguish between
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\[\ce{CH3 - Br ->[Mg/ether] (A) ->[(i) CO][(ii) Water] (B) ->[CH3OH/H+][Δ] (C)}\]
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Arrange the following in the increasing order of their property indicated:
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Draw the structure of the following derivative.
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Draw structure of the following derivative.
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