When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of $A$ ?
$\mathrm{C}_{9} \mathrm{H}_{8}$
$\mathrm{C}_{5} \mathrm{H}_{8}$
$\mathrm{C}_{11} \mathrm{H}_{4}$
$\mathrm{C}_{11} \mathrm{H}_{8}$
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