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Q.

Reactivity of order of halides for dehydrohalogenation is 

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a

R – F > R – Cl > R – Br > R – I

b

R – I > R – Br > R – Cl > R – F

c

R – I > R – Cl > R – Br > R – F

d

R – F > R – I > R – Br > R – Cl

answer is B.

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Detailed Solution

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Reactivity order of halides for dehydrohalogenation is R−I>R−Br>R−Cl>R−F. Alkyl iodides are most reactive and alkyl fluorides are least reactive. Iodide ion is a good leaving group, as the negative charge is on a larger atom and is dispersed. Also, C−I bond is weaker than C−F bond.

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