Allyl isocyanide has:

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(D) The structure of allyl isocyanide is $CH_2=CH-CH_2-N\rightleftharpoons C$. Counting the bonds: - $C-H$ bonds: $5$ - $C-C$ bonds: $2$ - $C-N$ bond:

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$9$ sigma bonds,$3$ pi bonds and $2$ non-bonding electrons

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(D) The structure of allyl isocyanide is $CH_2=CH-CH_2-N\rightleftharpoons C$. Counting the bonds: - $C-H$ bonds: $5$ - $C-C$ bonds: $2$ - $C-N$ bond: $1$ - $N-C$ bond: $1$ Total sigma bonds = $5 + 2 + 1 + 1 = 9$. - $C=C$ bond: $1$ pi bond - $N\rightleftharpoons C$ bond: $2$ pi bonds Total pi bonds = $1 + 2 = 3$. - Non-bonding electrons: The nitrogen atom has $1$ lone pair ($2$ electrons) and the terminal carbon atom has $1$ lone pair ($2$ electrons). However,in the coordinate bond representation $N\rightleftharpoons C$,the terminal carbon has $2$ non-bonding electrons. Thus,it has $9$ sigma bonds,$3$ pi bonds,and $2$ non-bonding electrons.

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