STD 11 - 8.2 Organic chemistry isomerism — JEE STD 11 Science — Question

$(A)$Covalent radius decreases down the group from $\mathrm{C}$ to $\mathrm{Pb}$ in a regular manner.

$(B)$ Electronegativity decreases from $\mathrm{C}$ to $\mathrm{Pb}$ down the group gradually.

$(C)$ Maximum covalence of $\mathrm{C}$ is $4$ whereas other elements can expand their covalence due to presence of $d$ orbitals.

$(D)$ Heavier elements do not form $\mathrm{p} \pi-p \pi$ bonds.

$(E)$ Carbon can exhibit negative oxidation states.

Choose the correct answer from the options given below:

while $E_{Z{n^{2 + }}/Zn}^o =  - 0.76\,V$