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The number of sigma-and pi-bond in 1-but...

The number of `sigma`-and `pi`-bond in 1-buten-3-yne is:

A

`6sigma` and `4pi`

B

`7sigma` and `3pi`

C

`5sigma` and `5pi`

D

`8sigma` and `2pi`

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The correct Answer is:
B

Make the complete structural formula:
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