How many sigma and pi bonds are in allylcyanide?

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How many sigma and pi bonds are in allylcyanide?

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Answer 1 · 2016-07-06T03:46:32

I got:

$9$ $\mathbf(9)$ $σ$ $sigma$ bonds
$3$ $\mathbf(3)$ $π$ $pi$ bonds

"Allyl" means there's a $C = C$ $"C"="C"$ double bond that starts two atoms away from the pertinent functional group (rather than one atom away, which is "vinyl").

So, allyl cyanide is:

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Or, drawn out in full:

Each single bond contains only one sigma ( $σ$ $sigma$ ) bond and nothing else, and thus, if you consider the skeletal structure without any pi ( $π$ $pi$ ) bonds, you would get:

$3$ $\mathbf(3)$ $C - C$ $"C"-"C"$ $σ$ $sigma$ bonds
$1$ $\mathbf(1)$ $C - N$ $"C"-"N"$ $σ$ $sigma$ bond
$2 + 1 + 2 = 5$ $2+1+2 = \mathbf(5)$ $C - H$ $"C"-"H"$ $σ$ $sigma$ bonds

Now counting the $π$ $pi$ bonds, we have (in addition to the $σ$ $sigma$ bonds we already counted) one $π$ $pi$ bond for each double bond and two $π$ $pi$ bonds for each triple bond.

Therefore, we have:

$1$ $\mathbf(1)$ $C - C$ $"C"-"C"$ $π$ $pi$ bond
$2$ $\mathbf(2)$ $C - N$ $"C"-"N"$ $π$ $pi$ bonds

So, we have a total of:

$9$ $\mathbf(9)$ $σ$ $sigma$ bonds
$3$ $\mathbf(3)$ $π$ $pi$ bonds

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How many sigma and pi bonds are in allylcyanide?

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