Question

Which of the following is an example of polar covalent compound?

• A. $H_{2}O$
• B. $C{l}_2$
• C. $NaCl$
• D. $B{r}_2$

Answer 1

The correct option is A $H_{2}O$

When electrons are shared between different atoms, the shared pair of electron gets more attracted to one atom due to the difference in the electronegativity of the atoms. Due to this, partial positive and negative charge develops over the bonded atoms and such molecules exhibit polar character.

$\bullet$ For example, the water molecule $\left(H_{2}O\right)$ is made of hydrogen and oxygen having different electronegativity. Hence, it exhibit polar characteristics.

$\bullet$ $C{l}_2$, $B{r}_2$ consist of one type of atoms and hence same electronegativity. So, they do not exhibit any polar character.

$\bullet$ In case of $NaCl$ molecule, complete transfer of electrons takes place instead of sharing of electrons. Hence, $NaCl$ is not a covalent compound but is an example of ionic compound.