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How many of the following statements are correct regarding FNNF molecule.
i) It exists as two distinct geometric isomers.
ii) It is planar.
iii) Its nitrogen-nitrogen bond is longer than that in $N_{2} F_{4}$ .
iv) It is more stable than its structural isomer with both fluorine atoms bonded to the same nitrogen.

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answer is 3.

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N-N bond is shorter in $N_{2} F_{2}$ than $N_{2} F_{4}$

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