The number of sigma and pi-bonds in but-1-ene-3-yne are:
A
5 σ and 5 π
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B
7 σ and 3 π
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C
8 σ and 2 π
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D
6 σ and 4 π
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Solution
The correct option is B 7 σ and 3 π Single bond contains only a sigma bond, one double bond contains a sigma and a π bond, whereas a triple bond contains a sigma bond and 2 π bonds.
So, CH2=CH−C≡CH
Number of σ bonds = 2 + 1 + 1 + 1 + 1 + 1 = 7
Number of π bonds = 1 + 2 = 3