InterviewSolution
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InterviewSolution
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Calculate the dipole moment of m-Dichlorobenzene if the dipole moments of C-Cl bondsare 1.72D.(a) 0(b) 1.72D(c) 2.54D(d) 2.98DThe question was asked in an internship interview.My question is based upon Haloarenes Physical Properties topic in chapter Haloalkanes and Haloarenes of Chemistry – Class 12 |
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Answer» RIGHT option is (b) 1.72D To elaborate: The angle between the two halogen atoms in meta isomer is 120° and let the DIPOLE moments of C-Cl bonds be d=1.72D and let d’ be the dipole moment of the compound. So, by law of PARALLELOGRAM of FORCES, \(\Rightarrow \,d’ = \sqrt{d^2 + d^2 + 2d^2.cos(120°)}\) \(\Rightarrow \,d’ = \sqrt{1.72^2 + 1.72^2 – (2 \,X\, 0.5 \,x\, 1.72^2)}\) \(\Rightarrow \,d’ = \sqrt{1.72^2}\) \(\Rightarrow \,d’ = 1.72D\) |
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