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JEE Advanced levelSingle correct optionDifficulty 3 of 3si193

A dibromoalkane has the general formula . In a Carius estimation, 0.404 g of it gave 0.752 g of (Ag = 108, Br = 80, C = 12, H = 1). The molecular formula of the compound is

  1. A
  2. B
  3. C
  4. D

Answer: A

Moles of = 0.752/188 = 0.0040 mol. Each molecule has two Br, so moles of compound = 0.0020 mol and molar mass = 0.404/0.0020 = 202 g/mol. For , gives .
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