- ANucleophile.
- BCarbanion.
- ✓Free radical.
- DArbocation.
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(figure) $ + \xrightarrow[{{H_2}O}]{{B{r_2}}}$ ?

$(A)$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:
$\mathop C\limits^\Theta {H_3},\mathop N\limits^\Theta {H_2},\,\mathop O\limits^\Theta H,\,\mathop C\limits^\Theta l$