Is C2H2Br2 polar or nonpolar? – Polarity of C2H2Br2

Home  > Chemistry Questions >  C2H2Br2 polar or nonpolar?

The question is –

Is C2H2Br2 polar or nonpolar?


Cis-C2H2Br2 is polar while trans-C2H2Br2 is non-polar.


The polarity of C2H2Br2 depends on the arrangement of hydrogen and bromine atoms around the C=C double covalent bond.

1,2 dibromoethene (C2H2Br2) consists of a C=C double bond, two C-H single bonds, and two C-Br bonds.

The C=C bond is non-polar as it comprises of two identical carbon atoms having zero electronegativity differences.

A C-H bond is very weakly polar (almost non-polar as per Pauling’s electronegativity scale) as it consists of an electronegativity difference of only 0.35 units between the bonded carbon (E.N = 2.55) and hydrogen (E.N = 2.20) atoms.

Contrarily a C-Br bond is relatively more polar owing to an electronegativity difference of 0.41 units between the carbon and bromine (E.N = 2.96) atoms, respectively.

Each C-H bond thus possesses a small dipole moment value, while each C-Br bond has a relatively higher dipole moment value.

The shape of the molecule w.r.t each C-atom at the center is trigonal planar.

In cis-1,2-dibromoethene, the unequal dipole moments of C-H and C-Br bonds do not get canceled equally.

Thus it is overall polar (net µ > 0).

Contrarily, in trans-1,2-dibromoethene, the more electronegative Br-atoms are located directly opposite to each other.

Therefore, the C-H and C-Br dipole moments get canceled equally with the corresponding C-H and C-Br dipole moments, respectively, resulting in a non-polar molecule overall (net µ = 0). 

is c2h2br2 polar or nonpolar

Also, check –

How to identify polar or nonpolar compounds?

Did you like it?

About the author

Vishal Goyal is the founder of Topblogtenz, a comprehensive resource for students seeking guidance and support in their chemistry studies. He holds a degree in B.Tech (Chemical Engineering) and has four years of experience as a chemistry tutor. The team at Topblogtenz includes experts like experienced researchers, professors, and educators, with the goal of making complex subjects like chemistry accessible and understandable for all. A passion for sharing knowledge and a love for chemistry and science drives the team behind the website. Let's connect through LinkedIn:

Share it...

Leave a Comment

Your email address will not be published. Required fields are marked *

About Topblogtenz

Topblogtenz is a website dedicated to providing informative and engaging content related to the field of chemistry and science. We aim to make complex subjects, like chemistry, approachable and enjoyable for everyone.

Connect with us

Copyright © 2023 - All rights Reserved

Scroll to Top