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NEET2005ChemistryHydrocarbonsActual

Which one of the following compounds is most acidic?

Correct answer

2

Step-by-step solution

Phenols are more acidic than alcohols, due to the stabilization of phenoxide ion via resonance. Ortho nitrophenol is most acidic of all because - NO ₂ is a electron withdrawing group. Thus, NO ₂ stabilise of negative charge on the oxygen of phenoxide ion. On the other hand, CH ₃ group is a electron donating group. Thus, acidic strength of phenol is decreased in cresol due to destabilisation of phenoxide ion. Thus, correct order is: Caution Phenoxide ion is stabilized due to following resonating structures:

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