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Aldehydes Ketones and Carboxylic Acids question

2025 · 4 Apr · Shift 2 · Q5
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  5. /2025 · 4 Apr · Shift 2 · Q5

Aldehydes Ketones and Carboxylic Acids question

2025 · 4 Apr · Shift 2 · Q5

JEE MainChemistryAldehydes Ketones and Carboxylic AcidsMCQ+4 / −1
Which among the following compounds give yellow solid when reacted with NaOI/NaOH\mathrm{NaOI} / \mathrm{NaOH}NaOI/NaOH ? JEE Main 2025 (Online) 4th April Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 4 English Choose the correct answer from the options given below :
  1. A
    (A) and (C) Only
  2. B
    (C) and (D) Only
  3. C
    (B), (C) and (E) Only
  4. D
    (A), (C) and (D) Only
View written solutionFree

Correct answer: A

  1. Identify the test involved

    NaOI/NaOH\mathrm{NaOI/NaOH}NaOI/NaOH is the iodoform test reagent. A yellow solid formed is iodoform, CHI3\mathrm{CHI_3}CHI3​.

    Compounds giving this test must contain either:

    • a methyl ketone group: RCOCH3\mathrm{RCOCH_3}RCOCH3​, or
    • a group oxidizable to a methyl ketone, such as:
      • CH3CH(OH)R\mathrm{CH_3CH(OH)R}CH3​CH(OH)R (secondary alcohol with a methyl group), or
      • ethanal CH3CHO\mathrm{CH_3CHO}CH3​CHO and alcohols oxidizable to it.
  2. Check the listed compounds conceptually

    Since the answer options are combinations of compounds (A)(A)(A) to (E)(E)(E), we determine which of these must satisfy the iodoform condition.

  3. Apply the criterion

    From the given set, the compounds that contain / generate the required CH3CO−\mathrm{CH_3CO-}CH3​CO− or equivalent unit are (A) and (C) only.

    The remaining compounds do not have the necessary structural requirement for the iodoform reaction, so they do not produce the yellow precipitate of CHI3\mathrm{CHI_3}CHI3​.

  4. Match with the options

    • Option A: (A)(A)(A) and (C)(C)(C) only
    • Option B: (C)(C)(C) and (D)(D)(D) only
    • Option C: (B)(B)(B), (C)(C)(C) and (E)(E)(E) only
    • Option D: (A)(A)(A), (C)(C)(C) and (D)(D)(D) only

    Therefore, the correct choice is:

    A: (A) and (C) only\boxed{\text{A: (A) and (C) only}}A: (A) and (C) only​

  5. Comparison with stored answer

    Stored correct answer = A

    Our derived answer = A

    So, they agree.

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