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Consider the following substances 1 . C H 3 C ≡ C C H 3 2 . C H 3 C H 2 C ≡ C H 3 . C H 3 C H = C H C H 3 4 . C H 3 C H 2 C H = C H 2 Which of the following reagent can be used to distinguish the compound (2) from the rest of the compounds?

Options

  1. ABromine/ C C l 4
  2. BBromine/ C H 3 C O O H
  3. CAlk. K M n O 4
  4. DAmmonical A g N O 3 or ammoniacal cuprous chloride

Correct answer

D. Ammonical A g N O 3 or ammoniacal cuprous chloride

Step-by-step solution

Compound (2) has acidic hydrogen (acetylinic hydrogen), which can be replaced. C H 3 - C H 2 - C ≡ C H + A g N H 3 2 + O H - → C H 3 - C H 2 C ≡ C A g White ppt + H 2 O + 2 N H 3 C H 3 C H 2 C ≡ C H + C u N H 3 2 + O H - → C H 3 C H 2 C ≡ C C u Red ppt. + H 2 O + 2 N H 3 Compounds 1, 3 and 4 have no acidic hydrogen. Therefore, they do not react with reagent option D.

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