English
Karnataka Board PUCPUC Science 2nd PUC Class 12

Assertion: The α-hydrogen atom in carbonyl compounds is less acidic. Reason: The anion formed after the loss of α-hydrogen atom is resonance stabilised.

Advertisements
Advertisements

Question

Assertion: The α-hydrogen atom in carbonyl compounds is less acidic.

Reason: The anion formed after the loss of α-hydrogen atom is resonance stabilised.

Options

  • Assertion and reason both are correct and reason is correct explanation of assertion.

  • Assertion and reason both are wrong statements.

  • Assertion is correct statement but reason is wrong statement.

  • Assertion is wrong statement but reason is correct statement.

  • Assertion and reason both are correct statements but reasson is not correct explanation of assertion.

MCQ
Advertisements

Solution

Assertion is wrong statement but reason is correct statement.

Explanation:

Because of the presence of electron-withdrawing carbonyl group, the alpha hydrogen atom in carbonyl compounds is acidic. In nature, hydrogen is very acidic.

Because the cation is released in the form of \[\ce{H-}\], the anion created after the loss of the -hydrogen atom is resonance stabilised. 

shaalaa.com
  Is there an error in this question or solution?
Chapter 12: Aldehydes, Ketones and Carboxylic Acids - Multiple Choice Questions (Type - I) [Page 176]

APPEARS IN

NCERT Exemplar Chemistry Exemplar [English] Class 12
Chapter 12 Aldehydes, Ketones and Carboxylic Acids
Multiple Choice Questions (Type - I) | Q 44 | Page 176

RELATED QUESTIONS

Write the products formed when CH3CHO reacts with the following reagents: CH3CHO in the presence of dilute NaOH


How will you convert ethanal into the following compound?

But-2-enal


Describe the following:

Cross aldol condensation


Give reasons  Acetylation of aniline reduces its activation effect.


Write chemical equations of the following reaction : 

Propanone is treated with dilute Ba (OH)2-.


Write a chemical equation for the following reaction: 
Propanone is treated with dilute Ba( OH)2.


Explain aldol condensation reaction in detail.


Cannizaro’s reaction is not given by ______.


Why is there a large difference in the boiling points of butanal and butan-1-ol?


What product will be formed on reaction of propanal with 2-methylpropanal in the presence of \[\ce{NaOH}\]? What products will be formed? Write the name of the reaction also.


Why are carboxylic acids more acidic than alcohols or phenols although all of them have hydrogen atom attached to a oxygen atom \[\ce{(-O-H)}\]?


Assertion: Aromatic aldehydes and formaldehyde undergo Cannizaro reaction.

Reason: Aromatic aldehydes are almost as reactive as formaldehyde.


Give reasons to support the answer:

Presence of Alpha hydrogen in aldehydes and ketones is essential for aldol condensation.


The major product of the following reaction is:


Which of the following compounds will undergo self-condensation in the presence of dilute NaOH solution?


Assertion (A): The final product in Aldol condensation is always α, β-unsaturated carbonyl compound.

Reason (R): α, β-unsaturated carbonyl compounds are stabilised due to conjugation.


Which one of the following undergoes reaction with 50% sodiumhydroxide solution to give the corresponding alcohol and acid:


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×