Which of the following bonds is formed by the lateral overlap of $p-p$ orbitals?

Which of the following combinations does not form a $\sigma$ bond?
$(i) \ 2p_y - 2p_y$
$(ii) \ 2p_z - 2p_z$
$(iii) \ 2s - 2p_x$
$(iv) \ 2p_x - 2p_x$

$A$ molecule $(X)$ has $(i)$ four sigma bonds formed by the overlap of $sp^2$ and $s$ orbitals,(ii) one sigma bond formed by $sp^2$ and $sp^2$ orbitals,and (iii) one $\pi$ bond formed by $p_z$ and $p_z$ orbitals. Which of the following is $X$?

Which of the following represent zero overlap (non-bonding condition)?

Which orbitals on overlapping will form $\sigma$ and $\pi$ bond in $C=C$ of alkene? Explain.

What are the number of $\sigma$ and $\pi$ bonds in a sulfuric acid molecule,respectively?