Q10 / 125 · BITSAT 2018 · Chemistry

Which substance has a dipole moment?

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

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.

Hence, the correct answer is option: 'B'.

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