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Aldehydes Ketones and Carboxylic Acids question

2023 · 30 Jan · Shift 2 · Q2
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Aldehydes Ketones and Carboxylic Acids question

2023 · 30 Jan · Shift 2 · Q2

JEE MainChemistryAldehydes Ketones and Carboxylic AcidsMCQ+4 / −1
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: JEE Main 2023 (Online) 30th January Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 81 English 1 can be easily reduced using Zn−Hg/HCl\mathrm{Zn}-\mathrm{Hg} / \mathrm{HCl}Zn−Hg/HCl to JEE Main 2023 (Online) 30th January Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 81 English 2 Reason R:Zn−Hg/HCl\mathrm{R}: \mathrm{Zn}-\mathrm{Hg} / \mathrm{HCl}R:Zn−Hg/HCl is used to reduce carbonyl group to −CH2−-\mathrm{CH}_{2}-−CH2​− group. In the light of the above statements, choose the correct answer from the options given below:
  1. A
    Both A and R{ \text {Both } A \text { and }} \mathrm{R}Both A and R are true and R\mathrm{R}R is the correct explanation of A\mathrm{A}A
  2. B
    A\mathrm{A}A is false but R\mathrm{R}R is true
  3. C
    A is true but R\mathrm{R}R is false
  4. D
    Both A\mathrm{A}A and R\mathrm{R}R are true but R\mathrm{R}R is not the correct explanation of A\mathrm{A}A
View written solutionFree

Correct answer: B

  1. Identify the reagent

    The reagent Zn ⁣−Hg/HCl\mathrm{Zn\!- Hg/HCl}Zn−Hg/HCl is Clemmensen reduction.

  2. What does Clemmensen reduction do?

    It reduces the carbonyl group of aldehydes and ketones: >C=O⟶>CH2>C=O \longrightarrow >CH_2>C=O⟶>CH2​ Hence, the Reason RRR:

    Zn−Hg/HCl\mathrm{Zn-Hg/HCl}Zn−Hg/HCl is used to reduce carbonyl group to −CH2−-\mathrm{CH_2}-−CH2​− group is true.

  3. Check the Assertion

    The assertion claims that the given compound can be easily reduced using Zn−Hg/HCl\mathrm{Zn-Hg/HCl}Zn−Hg/HCl to the stated product.

    However, Clemmensen reduction works for aldehydes and ketones under strongly acidic conditions, and the transformation stated in the assertion is not a valid/easy Clemmensen reduction as written.

    Therefore, Assertion A is false.

  4. Conclusion

    • Assertion AAA: False
    • Reason RRR: True

    Therefore, the correct option is: B\boxed{\text{B}}B​

  5. Comparison with stored answer

    Stored correct answer = B\boxed{\text{B}}B​

    My derived answer matches the stored answer.

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