What is the correct order of enthalpy of dissociation of halogens?(a) F2 > Cl2 > Br2 > I2(b) Cl2 > Br2 > F2 > I2(c) Cl2 > F2 > Br2 > I2(d) F2 > Br2 > Cl2 > I2The question was asked in a job interview.I would like to ask this question from P-Block topic in division P-Block Elements of Chemistry – Class 12

What is the correct order of enthalpy of dissociation of halogens?(a)

1.	What is the correct order of enthalpy of dissociation of halogens?(a) F2 > Cl2 > Br2 > I2(b) Cl2 > Br2 > F2 > I2(c) Cl2 > F2 > Br2 > I2(d) F2 > Br2 > Cl2 > I2The question was asked in a job interview.I would like to ask this question from P-Block topic in division P-Block Elements of Chemistry – Class 12
Answer» Correct OPTION is (b) Cl2 > Br2 > F2 > I2 Easiest explanation: Enthalpy of dissociation decreases as the bond distance increases from F2 to I2 due to a corresponding increase in the size of the ATOM as we move down the group from F to I. The F-F bond dissociation enthalpy is, however, smaller than that of Cl-Cl and EVEN smaller than that of Br-Br. This is due to the reason that F atom is very SMALL and HENCE the electron-electron repulsions between the lone pairs of electrons are very large.

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