Question

How many lone pair of electrons are present on the central atom of CH${}_4$, NH${}_3$, PCl${}_3$ and PCl${}_5$ molecules?

• A. $0,1,1,0$
• B. $0,1,1,1$
• C. $0,0,1,1$
• D. $0,0,0,1$

Answer 1

Answer: (A)

$0,1,1,0$

Methane $\left(C{H}_4\right)$ does not have lone pair of electrons.

Ammonia$\left(N{H}_3\right)$ has one lone pair of electron on nitrogen atom.

$PC{l}_3$ has one lone pair of electron on phosphorous atom.

$PC{l}_5$ does not have lone pair of electrons.

So answer is A.