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 $Br$: $|Ar|3d^{10}4s^{2}4p^5.$ Bromine shows valency of $1$ as the p-orbital is only $1$ electron short to attain the inert gas configuration.
So, for bonding p-p orbitals overlap occurs.

b) Electronic Configuration of $H$: $1s^1$ (1 valence electron) and Electronic Configuration of Br: $|Ar|3d^{10}4s^{2}4p^3.$
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.
Hence,Correct Option is (a).