Hi! There's a question in one of the chemistry past papers (9701_s14_qp_23 que 4 a) which says:
Explain the decreasing trend in the reactivities of the halogens with hydrogen in terms of bond energies.
The marking scheme says :
X-X bond strength decreases from chlorine to iodine
But decreasing strength of H-X down group more significant.
Can someone please explain why?? How does decreasing bond energy lead to a DECREASE in reactivity......
please help as soon as possible.