Which substance has a dipole moment?

Options

A ${CCl}_{4}$
B ${CH}_{2}{Cl}_{2}$
C ${C}_{2}{Cl}_{2}$
D ${C}_{2}{Cl}_{4}$

Correct answer

B. ${CH}_{2}{Cl}_{2}$

Step-by-step solution

${CH}_{2}{Cl}_{2}$ is similar to ${CH}_{4}$ (tetrahedral) but it has three different bond angles. $HCH, HCCl, ClCCl,$ which are close to but not equal to $109. 5 °.$ Since, electronegativity of $Cl > C > H$ the bond dipole moments do not cancel and the molecule has a dipole moment.

Which substance has a dipole moment?

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