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Q.68. Consider the three aromatic molecules (P, Q and R) whose structures have been given below : [Figure: Three aromatic molecules P, Q, R. P is 1,3,5-trimethylbenzene (mesitylene). Q is 1,2,4,5-tetramethylbenzene (durene). R is hexamethylbenzene.] The correct order regarding the reactivity of these compounds with Ph-N=N⁺Cl⁻ under optimum but (+) slightly acidic medium is :

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