Which of the following pair shows lowest bond dissociation enthalpy among hydrogen halides and highest bond dissociation enthalpy among halogens (respectively).

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$H F, I_{2}$

$H I, C l_{2}$

$H B r, B r_{2}$

$H C l, F_{2}$

answer is A.

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Detailed Solution

Bond dissociation enthalpy order for hydrogen halides is $H F > H C l > H B r > H I$
Bond dissociation enthalpy order for halogens: $C l_{2} > B r_{2} > F_{2} > I_{2}$

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