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

Predict the product of the following reaction: ..............O..............||R−CH=CH−CHO+NHA2−C−NH−NHA2→HA+

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प्रश्न

Predict the product of the following reaction:

\[\begin{array}{cc}
\phantom{..............}\ce{O}\\
\phantom{..............}||\\
\ce{R - CH = CH - CHO + NH2 - C - NH - NH2 ->[H+]}\end{array}\]

रासायनिक समीकरण/संरचनाएँ
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उत्तर

\[\begin{array}{cc}
\phantom{........................}\ce{O}\phantom{....................................................}\ce{O}\\
\phantom{........................}||\phantom{....................................................}||\\
\ce{R - CH = CH - CHO + NH2 - C - NH - NH2 ->[H+]\underset{3-alkyl prop-2-enyl semicarbenzene}{R - CH = CH - CH = N - NH - C - NH2}}\
\end{array}\]

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अध्याय 8: Aldehydes, Ketones and Carboxylic Acids - Intext Questions [पृष्ठ २४३]

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एनसीईआरटी Chemistry Part 1 and 2 [English] Class 12
अध्याय 8 Aldehydes, Ketones and Carboxylic Acids
Intext Questions | Q 8.5 (iii) | पृष्ठ २४३

संबंधित प्रश्न

Write balanced chemical equations for action of ammonia on - formaldehyde


How are the following compounds prepared?

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Acetaldehyde, Acetone, Di-tert-butyl ketone, Methyl tert-butyl ketone (reactivity towards HCN)


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\[\ce{C6H5CHO ->[H2NCONHNH2]}\]


How are the following compounds prepared?

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


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

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


What happens when ethanal is treated with excess ethanol and acid?


Which will undergo faster nucleophilic addition reaction?

Acetaldehyde or Propanone


The following questions are case-based questions. Read the passage carefully and answer the questions that follow:

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.

Answer the following:

(a) Write the name of the product when an aldehyde reacts with excess alcohol in the presence of dry HCl. (1)

(b) Why carboxylic acid is a stronger acid than phenol? (1)

(c) (i) Arrange the following compounds in increasing order of their reactivity towards CH3MgBr: (1)

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

(ii) Write a chemical test to distinguish between propanal and propanone. (1)

OR

(c) Write the main product in the following: (2)

(i)
(ii)

Why dissociation of HCN is suppressed by the addition of HCL?


Draw structure of the following derivative.

The ethylene ketal of hexan-3-one


Draw structures of the following derivative.

The ethylene ketal of hexan-3-one


Draw structure of the following derivative:

Acetaldehydedimethylacetal


Draw structure of the following derivative:

Acetaldehydedimethylacetal


Draw the structure of the following derivative.

Acetaldehydedimethylacetal


Give an example of the reaction in the following case.

Imine


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