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In which of the following cases C-C bond...

In which of the following cases `C-C` bond length will be highest?
(I) In `N_(2)F_(4)`, d-orbitals are contracted by electronegative flourine atoms, but d-orbitals contraction is not possible by H-atoms in `N_(2)H_(4)`
(II) The `N-N` bond energy in `N_(2)F_(4)` is more than `N-N` bond energy in `N_(2)H_(4)`
(III) The `N-N` bond length in `N_(2)F_(4)` is more than that of in `N_(2)F_(4)`
(IV) The `N-N` bond length in `N_(2)F_(4)` is less than that of in `N_(2)H_(4)`
choose the correct codes:

A

I, II and III

B

I and III

C

II and IV

D

II and III

Text Solution

Verified by Experts

The correct Answer is:
B

It can be explained on the basis of Bent's Rule . In `N_(2)F_(4)`, N-N bond has more s-character hence bond length decrease.
While in `N_(2)H_(4), N-N` bond has less s-character (i.e., more p-character), hence bond lengths.
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