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JEE Main202329 Jan 2023Evening ShiftChemistryHydrocarbonsActual

When a hydrocarbon A undergoes combustion in the presence of air, it requires 9 . 5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A ?

Options

  1. AC 8 H 6
  2. BC 9 H 9
  3. CC 6 H 6
  4. DC 9 H 6

Correct answer

A. C 8 H 6

Step-by-step solution

C x H y + x + y 4 O 2 → xCO 2 + y 2 H 2 O Number of equivalents of O 2 = Number of equivalents of H 2 O Number of equivalents of H 2 O = y 2 = 3   ⇒   y   =   6 Number of equivalents of O 2 = x + y 4 =   9 . 5 ⇒ x   +   6 4   =   9 . 5 ⇒   x   +   1 . 5   =   9 . 5 ⇒   x   =   9 . 5   -   1 . 5   =   8 ⇒ x = 8 ,   y = 6 . So, the formula is C 8 H 6 .

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