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

$A$ 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 contains $p\pi - p\pi$ bonding?

Draw diagrams showing the formation of a double bond and a triple bond between carbon atoms in $C_2H_4$ and $C_2H_2$ molecules.

Where is the nodal plane of the $\pi$-bond in ethene located?

Which of the following statements is $NOT$ true regarding the sigma and pi bonds formed between two carbon atoms?