The molecule is as follows; H₃C---C==CH₂ | H --- represents single bonds whilst == represents double bonds Single bonds are formed by sigma orbital head on overlap between sigma orbitals of C and H in the case of C-H bonds and between C sigma orbitals in the case of C-C bonds the number of sigma bonds are therefore the number of single bonds which are: 6 C-H bonds 2 C-C bonds altogether 8 sigma bonds p orbitals side- on overlap forms a pi bond. In double bonds, there's one sigma bond and one pi bond. number of double bonds - 1 C=C therefore one pi bond Answer is <span>4) 8 sigma and 1 pi</span>
