IMAT 2014 Chemistry Q52

Hi, can anyone help me in this question! Thank you very much!!!

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strongest permanent molecular dipoles are usually with halogens involved and since B has both compounds with halogens in it: it’s the answer. Halogens are highly electronegative with permanent dipoles so that’s why they can create strong bonds in a compound.


Thank you so much!!!

Hi, can I ask more about induce dipole, I’m confused between permanent and induce dipole? How can we differentiate between them? Thank you so much!!!

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Hi! It’s a very long explanation but I’ll condense it for you:

Induced dipole refers to the dipole moment that creates in a NON POLAR compound due to the effect of an ion nearby by disturbing the arrangement of electrons in the nonpolar species. Like if the ion is positive, the electrons in the non polar compound would sort of distort towards it because its attracted to the ion.

eg: Hydrogen bonding within water is a very common example of this. The electronegative oxygen of one H2O molecule is attracted to the electropositive hydrogen of ANOTHER H2O molecule.

Permanent dipole refers to the dipole moment that ORIGINALLY occurs in a compound due to uneven electron distribution. These occur when two atoms in a molecule have substantially different electronegativity: One atom attracts electrons more than another, becoming more negative, while the other atom becomes more positive.

eg: HCL, H2O (within the same molecule), Molecules with mirror symmetry like oxygen, nitrogen, carbon dioxide, and carbon tetrachloride have no permanent dipole moments

Does this help? :))


Oh thank you so much!!! I really appreciate it! Have a great day!

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Hi, I want to ask, after reading your explanation, can I understand by this way? Hope you can correct me if I’m wrong.
So in polar bond there is usually permanent dipole and in nonpolar bond there is usually induced dipole, right?
Thank you so much again!

Yes usually that’s the case! I’m not sure if there are exceptions so if anyone knows let us know!!

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I got it, thank you so much!!!

hey! :ok_woman: Shouldnt this be an example of permanent dipole moment (H bond)?

That’s within the molecules but there is also induced dipole between the molecules :)) Like I said, between the oxygen of one molecule and the hydrogen of ANOTHER molecule

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ohhh okay! So there are both forces. Thank you so much Raya for your patience and I wish you the best​:pleading_face::two_hearts:

Haha of course!! Let me know if you need anything else:)) xx

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