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The order of decreasing reactivity towards an electrophilic reagent, for the following would be:

1. (iv)>(ii)>(iii)>(i)
2. (i)>(ii)>(iii)>(iv)
3. (iv)>(iii)>(ii)>(i)
4. (i)>(iii)>(ii)>(iv)

Correct answer: (iv)>(iii)>(ii)>(i)

Solution

Electrophilic reagents react more readily with electron-rich species. The reactivity order depends on the electron-donating or withdrawing effects of substituents on the compounds, which influence the electron density at the reactive site.

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