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Which has highest dipole moment??

CH3Cl, CH2Cl2, CHCl3 or CCl4.

well, I saw a video or Merit nation and i found that the answer that I had to this question is wrong.

I thoungh that CH2Cl2 had highest Dipole Moment but the answer was given as CHCl3 in merit nation.

SO, i'll tell my logic to the answer, Pls tell me how I am wrong.

OK, Now CHCl3 has one C-Cl bond. We will keep it's dipole moment as A.

CH2Cl2 has two dipole moments each of A value. If each has A value, we can vectorially add them and get the dipole of the combination as 2(cos(109.5/2))A. that comes to be 1.14A.

CHCl3 will have a dipole moment of A in the opposite direction of the hydrogen by the same logic as above.

CCl4 will have 0 Dipole moment with the same logic as above.

Can you please tell me where I went wrong??

ch2cl2 is only correct..coz in all other cases dipole moments cancel off..or are minimised..

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But Meritnation video says that the dipole moment is highest for CH3Cl.

Pls, some expert make this clear.

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because it is so,the chlorine atom iselectronegative than carbon its moment will direct away and cause greater dipole monen
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CH3Cl has highest dipole moment than CH2Cl2, CHCl3, CCl4 because dipole moment is inversely proportional to number of halogen atoms
  • -4
In CH3Cl the polarity vectors of 3 H atoms and Cl atoms add up and give it a large dipole moment... In CH2Cl2 the polarity vectors of 2 H atoms add up to Cl atoms but vector of one Cl atom cancels half of the effect of other Cl atom and give it a smaller dipole moment compared to CH3Cl.. In CH3Cl the polarity vector of only one H atom adds up and 3 Cl atoms cancel each others effect and give it a much smaller dipole moment... So order of relative dipole moments is:- CH4=CCl4
  • -8
CH3CL have most dipole moment
  • -5
Due to 2 cl atoms the bond angle is slightly more than 120 degree so resultant is less
  • -3

No, it's wrong

Consider the case of ch2cl2
consider that both the cl atoms are at trans position which will an isomer of it then there you will get that the net dipole moment will be zero

But in the case of chcl3
you may take any isomer of it the net dipole moment will come out to be non zero and will have some of it

Hence ch2cl2<chcl3

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