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Alcohols Phenols and Ethers question

2021 · 26 Feb · Shift 2 · Q2
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Alcohols Phenols and Ethers question

2021 · 26 Feb · Shift 2 · Q2

JEE MainChemistryAlcohols Phenols and EthersMCQ+4 / −1
Ceric ammonium nitrate and CHCl3CHCl_3CHCl3​/alc. KOHKOHKOH are used for the identification of functional groups present in ‾\underline{\hspace{2cm}}​ and ‾\underline{\hspace{2cm}}​ respectively.
  1. A
    amine, alcohol
  2. B
    alcohol, phenol
  3. C
    alcohol, amine
  4. D
    amine, phenol
View written solutionFree

Correct answer: C

  1. Identify what each reagent tests for

    (i) Ceric ammonium nitrate test

    • Ceric ammonium nitrate (CAN) is a characteristic test for alcohols.
    • Alcohols give a red/orange-red coloration with CAN due to complex formation.

    Therefore, the first blank is alcohol.

  2. Second reagent: CHCl3CHCl_3CHCl3​/alc. KOH

    • CHCl3CHCl_3CHCl3​ with alcoholic KOH is used in the carbylamine test.
    • In this test, primary amines react with chloroform and alcoholic KOH to form isocyanides (carbylamines) having a foul smell.

    Reaction: RNH2+CHCl3+3KOH→RNC+3KCl+3H2ORNH_2 + CHCl_3 + 3KOH \rightarrow RNC + 3KCl + 3H_2ORNH2​+CHCl3​+3KOH→RNC+3KCl+3H2​O

    Therefore, the second blank is amine.

  3. Match with the options

    We get: Ceric ammonium nitrate→alcohol\text{Ceric ammonium nitrate} \to \text{alcohol}Ceric ammonium nitrate→alcohol CHCl3/alc. KOH→amineCHCl_3/\text{alc. }KOH \to \text{amine}CHCl3​/alc. KOH→amine

    So the correct pair is: alcohol, amine\boxed{\text{alcohol, amine}}alcohol, amine​

  4. Check options

    • A: amine, alcohol →\to→ incorrect
    • B: alcohol, phenol →\to→ incorrect
    • C: alcohol, amine →\to→ correct
    • D: amine, phenol →\to→ incorrect

Hence, the correct answer is Option C.

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