Question

Which of the following has a non zero dipole moment?

• A. $PC{l}_5$
• B. $Cl{F}_3$
• C. $Xe{F}_4$
• D. $C_2{H}_{5}C\equiv C{C}_2{H}_5$

Answer 1

Answer: (B)

$Cl{F}_3$

$PC{l}_5$ is a symmetrical molecule. It's net dipole moment is zero.
$Cl{F}_3$ has distorted geometry due to the presence of lone pairs on $Cl$ atom, $\mu \ne 0$.
$Xe{F}_4$ is square planar and is a symmetrical molecule.
$C_2{H}_5-C\equiv C-C_2{H}_5$ is also symmetrical and hence the net dipole is zero.

Option B is correct.