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Which formula represents an unsaturated hydrocarbon? Picture I
How many pairs of electrons are shared between the two nitrogen atoms? Picture II

I NEED EXPLANATION FOR BOTH QUESTIONS, PLEASE HELP ME! :)

Which formula represents an unsaturated hydrocarbon Picture IHow many pairs of electrons are shared between the two nitrogen atoms Picture III NEED EXPLANATION class=
Which formula represents an unsaturated hydrocarbon Picture IHow many pairs of electrons are shared between the two nitrogen atoms Picture III NEED EXPLANATION class=