Cyclopropylbenzoic acid

The pKa of p-cyclopropylbenzoic acid is 4.45. Is cvclopropylbenzene likely to be more reactive or less reactive than benzene toward electrophilic bromination Explain. 

A pAa of 4.45 indicates that p-cyclopropylbenzoic acid is a weaker acid than benzoic acid. This, in turn, indicates that a cyclopropyl group must be electron-donating. Since electron-donating groups increase reactivity in electrophilic substitution reactions, p-cyclopropylbenzene should be more reactive than benzene toward electrophilic bromination. 

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