Question
What are non-benzanoid aromatic compounds? Explain with examples.

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$\text{NO}^+_2,\text{BCl}_3,\text{CO}_2,\text{BeCl}_2$
$\text{CH}_3-\text{CH}_3,\text{CH}=\text{CH}_2,\text{HC}\equiv\text{CH}$
$\Delta_\text{f}\text{H}^\circ$ of KF = -560.8kJ mol-1, Sublimation energy of K = 87.8kJ mol-1, Dissociation energy of F, is 158.9kJ mol-1, Lattice energy of KF is -807.5kJ mol-1 and Ionisation energy of K is 414.2kJ mol-1.