मराठी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Carboxylic acids contain carbonyl group but do not show the nucleophilic addition reaction like aldehydes or ketones. Why?

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प्रश्न

Carboxylic acids contain carbonyl group but do not show the nucleophilic addition reaction like aldehydes or ketones. Why?

टीपा लिहा
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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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पाठ 12: Aldehydes, Ketones and Carboxylic Acids - Multiple Choice Questions (Type - I) [पृष्ठ १७३]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
पाठ 12 Aldehydes, Ketones and Carboxylic Acids
Multiple Choice Questions (Type - I) | Q 32 | पृष्ठ १७३

संबंधित प्रश्‍न

Acetaldehyde, when treated with which among the following reagents does NOT undergo addition reaction?

(A) Ammonia

(B) Hydroxylamine

(C) Ammoniacal silver nitrate

(D) Semicarbazide


Arrange the following compound in increasing order of its reactivity in nucleophilic addition reactions.

Benzaldehyde, p-Tolualdehyde, p-Nitrobenzaldehyde, Acetophenone.

Hint: Consider steric effect and electronic effect.


Predict the product of the following reaction:


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


How are the following compounds prepared?

benzaldehyde from benzoyl chloride


What is the action of the following reagents on ethanoic acid?

1) `LiAlH_4"/"H_3O^+`

2) `PCl_3 , "heat"`

3) `P_2O_5, "heat"`


Give a simple chemical test to distinguish between 
 


Identify the compounds A, B and C in the following reaction.

\[\ce{CH3 - Br ->[Mg/ether] (A) ->[(i) CO][(ii) Water] (B) ->[CH3OH/H+][Δ] (C)}\]


Which one of the following gives only one monochloro derivative?


Which among the following is most reactive to give nucleophilic addition?


What is the action of sodium hypoiodite on acetone?


Arrange the following in the increasing order of their property indicated:

Ethanal, Propanone, Propanal, Butanone (reactivity towards nucleophilic addition)


Write the structure of the product formed when acetone reacts with 2, 4 DNP reagent.


Draw the structure of the following derivative.

The ethylene ketal of hexan-3-one


Draw structure of the following derivative.

The ethylene ketal of hexan-3-one 


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