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(D) multiple covalent bond (double or triple bond) exists when two atoms share more than one pair of electrons.In $H_2$,there is a single bond $(H-H)$

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$(b)$ and $(c)$

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(D) multiple covalent bond (double or triple bond) exists when two atoms share more than one pair of electrons.In $H_2$,there is a single bond $(H-H)$.In $N_2$,there is a triple bond $(N \equiv N)$.In $C_2H_4$ (ethene),there is a double bond between the carbon atoms $(CH_2=CH_2)$.Therefore,both $N_2$ and $C_2H_4$ contain multiple covalent bonds.

Multiple covalent bonds exist in a molecule of

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