Which contain at least one `e^(-) "in" sigma 2p` bonding MO

Which one has least bond angle:

Molecular orbitals are formed by the overlap of atomic orbitals. Two atomic orbitals combine to form two molecular orbitals called bonding and antibonding MO s . The molecular orbitals are filled with electrons following the same rules as followed for filling of atomic orbitals. The molecular orbitals electronic configurations help us to calculate bond order when which give important information about bond strength and bond length. Considering Z - axis as internuclear axis, which one of the following will be for sigma antibonding MO? (i) 2p_(y)+2p_(y)" "2p_(x)-2p_(y) (iii) 2s+2p_(z)" "(iv) 2p_(z)-2p_(z)

Which of the following species contain only sigma bond?

Which of the following molecules possesses one sigma bond and two pi bonds?

Which of the following species contains equal number of sigma and pi bonds ?

Which of the following species contains equal number of sigma and pi bonds ?