Verified Solution • 2025–26 Session moderate

QJEEM23Che21f: JEE Main 2023 Chemistry - Class 11 JEEM23Che21f Solution: When a hydrocarbon A undergoes combustion in the presence of…

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?

Multiple Choice Options

  • A C9H6\mathrm{C_9H_6}
  • B C6H6\mathrm{C_6H_6}
  • C C8H6\mathrm{C_8H_6}
  • D C9H9\mathrm{C_9H_9}

Step-by-Step Verified Solution

CxHy+(x+y4)O2→xCO2+y2H2O{C_x}{H_y} + \left( {x + {y \over 4}} \right){O_2} \to xC{O_2} + {y \over 2}{H_2}O

y2=3{y \over 2} = 3

y=6y = 6

x+y4=192x + {y \over 4} = {{19} \over 2}

x=192−32=8x = {{19} \over 2} - {3 \over 2} = 8

So, formula is C8H6{C_8}{H_6} .

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