Question

Which one of the following molecules is formed by $p-p$ overlapping?

• A. $B{r}_2$
• B. $HBr$
• C. $H_{2}O$
• D. $P{H}_3$

Answer 1

The correct option is A $B{r}_2$

a): Electronic Configuration of $Br$: $\left[Ar\right]3d^{10}4s^{2}4p^5$. Bromine shows valency of 1 as the p-orbital is only 1 electron short to attain the inert gas configurtion.
So, for bonding $p-p$ orbitals overlap occurs.

b): Electronic Configuration of $H:1s^1$ (1 valence electron) and
Electronic Configuration of $Br$: $\left[Ar\right]3d^{10}4s^{2}4p^5$.
So, $s-p$ orbitals overlap.

c): Electronic Configuration of $H:1s^1$ and Electronic Configuration of $O$ : $1s^{2}2s^{2}2p^4$.
So, $s-p$ orbitals overlap.

d): Electronic Configuration of $P$: $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$
and Electronic Configuration of $H$: $1s^1$.
So, $s-p$ orbitals overlap.