Question

How many sigma and pi bonds are there in CH3-CH=CH-CH3

Answer 1

There are 3 sigma bonds between carbon carbon atoms.
There are 8 sigma bonds between carbon and hydrogen atoms.
Pi bonds can form only between carbon and carbon atoms so there is only one pi bond at the second place.

Thanks.

Answer 2

No.of sigma bonds(single bonds)-->11

No.of pi bonds(double bonds)-->1