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Based on your knowledge of periodic trends in electronegativity, which molecule listed below would you expect...

Based on your knowledge of periodic trends in electronegativity, which molecule listed below would you expect to have the largest molecular dipole (i.e. which would be the most polar molecule)? a. NH3 b. CH4 c. H2O

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Answer #1

Polarity is an indicator of charge separation within a molecule.

Let us consider a molecule . Higher the electronegativity () difference between A and B, higher will be the charge separation and more polar will be the molecule.

We know that

Subtracting from each,

i.e. the difference in electronegativity is maximum in case of O-H bond.

So H2O has the highest molecular dipole, i.e. it is the most polar of the three molecules.

Option (c) is correct.

Hope this helps, thanks!

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