The number of sigma and pi-bonds in 1-butene 3-yne are:

Options

A. 5 sigma and 5pi
B. 67sigma and 3 pi
C. 8 sigma and 2 pi
D. 6 sigma and 4 pi

Answer

B

Explanation

`underset("1-butene, 3-yne")(H underset(sigma)-overset(H)overset(| sigma)(C)underset(pi)overset(sigma)=overset(H)overset(|sigma)(C)overset(sigma)-Cunderset(2pi)overset(sigma)-=C overset(sigma)-H) sigma` -bond = 7, `pi` = bonds = 3