How would you account for the following:
(i) is an exothermic compound but is not.
(ii) The acidic strength of compounds increases in the order:
(iii) is kinetically inert.
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(i) F is more electronegative than Cl.
The difference in the electronegativity between N and F is much more than the difference between electronegativity of N and Cl. So there is need of much more energy to break the N-F bond.
(ii) As the electronegativity increases in the same period from left to right so their electronegativity are in the increasing order, P < S < Cl.
In the same way the acid strength is also in the increasing order i.e.,
(iii)Because is showing steric hindrance due to 6 (six) fluorine atoms which make it unable to react further with any other atom.