Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy? (AIIMS 2019)

As the size of the halogen atom increases from F to I, H–X bond length in halogen acids also increases from H–F to HI. (HF<HCl < HBr < HI). The increases in HX P-BLOCK ELEMENTS (GROUP 15-18) 30 bond length decreases the strength of HX bond from HF to HI (HF > HCl > HBr > HI). Due to successive decreases in the strength of HX bonds, bond dissociation enthalpy decreases form HF to HI. HX: HF > HCl > HBr > HI Bond dissociation 574.0 428.1 362.5 294.6 enthalpy (kJ/ mol)