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Q.

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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a

HF,I2

b

HI,Cl2

c

HBr,Br2

d

HCl,F2

answer is A.

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Detailed Solution

Bond dissociation enthalpy order for hydrogen halides is HF>HCl>HBr>HI 
Bond dissociation enthalpy order for halogens:  Cl2>Br2>F2>I2

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