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Practical Organic Chemistry question

2023 · 8 Apr · Shift 2 · Q13
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Practical Organic Chemistry question

2023 · 8 Apr · Shift 2 · Q13

JEE MainChemistryPractical Organic ChemistryMCQ+4 / −1
Given below are two statements: Statement I : Methyl orange is a weak acid. Statement II : The benzenoid form of methyl orange is more intense/deeply coloured than the quinonoid form. In the light of the above statement, choose the most appropriate answer from the options given below:
  1. A
    Both Statement I and Statement II are incorrect
  2. B
    Statement I\mathrm{I}I is incorrect but Statement II is correct
  3. C
    Both statement I and Statement II are correct
  4. D
    Statement I is correct but Statement II is incorrect
View written solutionFree

Correct answer: D

  1. Analyze Statement I: Methyl orange is a weak acid.

    Methyl orange is an azo dye indicator. Its color change is explained by the equilibrium HIn⇌H++In−\mathrm{HIn \rightleftharpoons H^+ + In^-}HIn⇌H++In− where the protonated form behaves as a weak acid.

    Therefore, Statement I is correct.

  2. Analyze Statement II: The benzenoid form of methyl orange is more intense/deeply coloured than the quinonoid form.

    For acid-base indicators, the quinonoid form is generally the more deeply colored form, while the benzenoid form is less intensely colored.

    In methyl orange:

    • Acidic form: quinonoid-type structure, red
    • Basic form: benzenoid-type structure, yellow

    The quinonoid form is more intensely/deeply coloured than the benzenoid form.

    Therefore, Statement II is incorrect.

  3. Choose the correct option:

    • Statement I: Correct
    • Statement II: Incorrect

    Hence, the correct option is: D\boxed{\text{D}}D​

  4. Comparison with stored answer:

    The stored correct answer is A, but our derived answer is D.

    So, I disagree with the stored answer. Statement I is a standard property of acid-base indicators like methyl orange, and Statement II is reversed because the quinonoid form is the more intensely colored one.

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