Question

The electron gain enthalpy (in kJ/mol) of fluorine, chlorine, bromine and iodine, respectively are : 

(1) – 333, – 349, – 325 and – 296 

(2) –296, – 325, – 333 and – 349 

(3) – 333, – 325, – 349 and – 296 

(4) –349, – 333, – 325 and – 296

Answer 1

Answer is (1) – 333, – 349, – 325 and – 296

Order of electron gain enthalpy (magnitude) is

Cl > F > Br > I

Answer 2

Answer is (1)

Electron gain enthalpy of Cl > F > Br > I