Given below are the atomic numbers of some group $14$ elements. The atomic number of the element with the lowest melting point is:

The compound of copper which turns green on keeping in air is

$(Me)_2SiCl_2$ on condensation after hydrolysis will produce

Evaluate the following statements related to group $14$ elements for their correctness.
$(A)$ Covalent radius decreases down the group from $C$ to $Pb$ in a regular manner.
$(B)$ Electronegativity decreases from $C$ to $Pb$ down the group gradually.
$(C)$ Maximum covalence of $C$ is $4$ whereas other elements can expand their covalence due to presence of $d$ orbitals.
$(D)$ Heavier elements do not form $p\pi-p\pi$ bonds.
$(E)$ Carbon can exhibit negative oxidation states.
Choose the correct answer from the options given below:

$FeS_2$ is

Which of the following does not exist?