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C-X polarity and C-X bond enthalpy

Hi I am doing some questions and I am really stuck on these two.
1)What would be the order of reactivity of halogenalkanes if the polarity of C-X bond were the only factor?
I thought it would increase as you go down the group Br is less electronegative than Cl or F. If it is less electronegative wouldn't it be easier to react with ?

2) what would be the order of reactivity for the halogenalkanes if the bond enthalpy of C-X bond were the only factor ?
I don't know about this one. Would it decrease ?

I dont know!! Please help :\
Sorry you've not had any responses about this. :frown:

Why not try posting in a specific subject forum- you might have more luck there.

Here's a link to our subject forum which should help get you more responses. :redface:

:h:

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