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The decreasing order of boiling points of alkyl halides is:

1. \( R F>R C l>R B r>R I \)
2. \( R B r>R C l>R I>R F \)
3. \( R I>R B r>R C l>R F \)
4. \( R C l>R F>R I>R B r \) E \( . R I>R F>R C l>R B r \)

Correct answer: \( R I>R B r>R C l>R F \)

Solution

Boiling points of alkyl halides increase as the halogen becomes larger and more polarizable, because London dispersion forces become stronger. Thus the order is RI > RBr > RCl > RF.

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