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

What is meant by the following term? Give an example of the reaction in the following case. Schiff’s base

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प्रश्न

What is meant by the following term? Give an example of the reaction in the following case.

Schiff’s base

रासायनिक समीकरण/संरचनाएँ
एक पंक्ति में उत्तर
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उत्तर

Aldehydes and ketones react with primary aliphatic or aromatic amines to form azomethine or Schiff's base.

\[\ce{\underset{Aldehyde}{R - CH = O} + \underset{1° amine}{H2N - R'} ->[H+][Heat] \underset{Schiff’s base}{R - CH = N - R'} + H2O}\]

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अध्याय 8: Aldehydes, Ketones and Carboxylic Acids - Exercises [पृष्ठ २५५]

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एनसीईआरटी Chemistry Part 1 and 2 [English] Class 12
अध्याय 8 Aldehydes, Ketones and Carboxylic Acids
Exercises | Q 8.1 (x) | पृष्ठ २५५

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The carbon-oxygen double bond is polarised in aldehydes and ketones due to higher electronegativity of oxygen relative to carbon. Therefore, they undergo nucleophilic addition reactions with a number of nucleophiles such as HCN, NaHSO3, alcohols, ammonia derivatives and Grignard reagents. Aldehydes are easily oxidised by mild oxidising agents as compared to ketones. The carbonyl group of carboxylic acid does not give reactions of aldehydes and ketones. Carboxylic acids are considerably more acidic than alcohols and most of simple phenols.

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CH3CHO, \[\begin{array}{cc}
\ce{(CH3)3C-C-CH3}\\
\phantom{....}||\\
\phantom{....}\ce{O}
\end{array}\],  \[\begin{array}{cc}
\ce{CH3-C-CH3}\\
||\\
\ce{O}
\end{array}\]

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