MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Organic ChemistryHydrocarbonsPhysical & Chemical Properties of Alkenes

Arrange the below compounds in the decreasing order of reactivity towards HBr:

A.a > b > c

B.b > a > c✓ Correct

C.b > c > a

D.a > c > b

Explanation

Among the following compounds, the decreasing order of reactivity towards HBr depends upon the ability of substituents attached to it. If the electron-donating group is attached, it will stabilize the carbocation formed. So out of these the electron-donating ability follows the order: 3 3 2 3 OCH CH CH OCH Hence, the correct option is(b).

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