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A:tetracyanomethane ; B:carbondioxide
C:benzene ; D: 1,3-buta-di-ene
Ratio of sigma and pi bonds is in order:
options:
(a)A=B<C<D
(b)A=B<D<C
(c)A=B=C=D
(d)C<D<A<B
please explain the correct answer.