The total number of sigma $(\sigma)$ and pi $(\pi)$ bonds in an ethylene molecule are

The number of $\sigma$ and $\pi$ bonds in sulfuric acid $(H_2SO_4)$ are respectively:

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Zero orbital overlap is an out-of-phase overlap.
Reason $R$: It results due to different orientation/direction of approach of orbitals.
In the light of the above statements,choose the correct answer from the options given below.

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

Which overlap results in the formation of the strongest bond?

The correct order of the extent of overlapping is: