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Thermal Decomposition of Alkanes

Why the iodin...

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Why the iodination of alkane is endothermic but chlorination and bromination are exothermic ?

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Q. Which of the following statement regarding free radical halogenation of alkane is not true?
(A) Hadrogen abstraction by halogen radical in the propagation step is exothermic in both chlorination and bromination
(B) Hydrogen abstraction by halogen radical in the propagation step is exothermic in cholorination but endothermic in bromination

N F_{3}

is an exothermic compound but

N C l_{3}

is an endothermic compound. Why? Explain.

Q. Assertion :Free redical bromination of alkane, in general, gives a bromo alkane with greater purity than purity of chloroalkane obtained in free redical chlorination reaction. Reason: Bromination of alkane is highly selective compared to chlorination reaction.

Q. Explain why formation of

{C l}^{-}

is exothermic but from

O^{-}

O^{2 -}

is endothermic?

Q. Chlorination of an alkane as compared to bromination proceeds?

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