Which molecule has the largest overall dipole? A в D H C=c 0=c 0=c=0 ci H ci

Choice B is correct because O is very highly electronegative, while C and H are moderately electronegative. As they are on opposite ends of the molecule, their electronegativities have a significant difference. Hence, There is a large overall dipole towards O. Choice A is incorrect because the dipoles of the chlorine atoms cancel out, so there will be no overall dipole. Choice C is incorrect because O is very highly electronegative, while Cl is highly electronegative. As they are on opposite ends of the molecule, their electronegativities approximately cancel out. Hence, There is a small overall dipole towards O. Choice D is incorrect because the dipoles of the oxygen atoms cancel out, so there will be no overall dipole.

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Chemical Reactions and Properties | 2009 - O/N - 9701/11 | Q5