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

Given below are two statements :
Statement $(I)$ : The oxidation state of an element in a particular compound is the charge acquired by its atom on the basis of electron gain enthalpy consideration from other atoms in the molecule.
Statement $(II)$ : $p\pi-p\pi$ bond formation is more prevalent in second period elements over other periods.
In the light of the above statements,choose the most appropriate answer from the options given below :

In a double bond between two carbon atoms of ethene,there are

Which of the following represents the nodal plane in the $\pi$-bond of ethene $(C_2H_4)$?

Which one is stronger,$\sigma$ bond or $\pi$ bond? Why?

The double bond between the two carbon atoms in ethylene $(CH_2=CH_2)$ consists of: