Q55 / 180 · NEET 2013 (All India) · Chemistry

Dipole-induced dipole interactions are present in which of the following pairs?

  • A
    $\mathrm{H}_2 \mathrm{O}$ and alcohol
  • B
    $\mathrm{Cl}_2$ and $\mathrm{CCl}_4$
  • Correct answer
    C
    $\mathrm{HCl}$ and $\mathrm{He}$ atoms
  • D
    $\mathrm{SiF}_4$ and $\mathrm{He}$ atoms

Solution

Dipole-induced dipole interaction are present in the pair in which the first species is polar and the other is non-polar. $\mathrm{H}_2 \mathrm{O}$ and alcohol both are polar molecules, so there exists dipole-dipole interactions in between them. $\mathrm{Cl}_2$ and $\mathrm{CCl}_4$ both are non-polar so there exists induced dipole-induced dipole interactions in between them. Similar is true for $\mathrm{SiCl}_4$ and $\mathrm{He}$ atoms pair. $\mathrm{HCl}$ is a polar molecule, whereas $\mathrm{He}$ atoms are non-polar, so in between them dipole-induced dipole interactions exist :

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

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