username2199397
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#1
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#1
Which compound has non-polar molecules

A) E-1,2-dichromobut-2-ene
B) E-2,3-dichromobut-2-ene
C) Z-2,3-dichromobut-2-ene
D) Z-1,4 dichromobut-2-ene

How did you work it out?
(I think the answer is B)
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alow
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username2199397
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It came up in the 2016 paper so its right

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NNB_Herath
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check the mark scheme
it should probably be B
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alow
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(Original post by shohaib712)
It came up in the 2016 paper so its right

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Pretty sure it isn't.
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username2199397
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It came in the ocr 2016 breadth dumbass.

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alow
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(Original post by shohaib712)
It came in the ocr 2016 breadth dumbass.

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A) E-1,2-dichromobut-2-ene
B) E-2,3-dichromobut-2-ene
C) Z-2,3-dichromobut-2-ene
D) Z-1,4 dichromobut-2-ene

None of those compounds exist, dumbass.
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charco
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(Original post by shohaib712)
It came in the ocr 2016 breadth dumbass.

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I think Mr Alow is gently suggesting that you have copied it down incorrectly (chromo instead of chloro)
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username2199397
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#9
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(Original post by alow)
None of those compounds exist, dumbass.
sorry. i meant to write chloro*.
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username2199397
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#10
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(Original post by alow)
None of those compounds exist, dumbass.
how would you answer it if its dichloro? Sorry for calling you a dumbass
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alow
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(Original post by shohaib712)
how would you answer it if its dichloro? Sorry for calling you a dumbass
For a molecule to have no net dipole the contribution of the individual polar bonds must cancel out. You need to look for the most symmetric structure (and the one where the C-Cl bonds are in the same direction with opposite signs).
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username2199397
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#12
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(Original post by alow)
For a molecule to have no net dipole the contribution of the individual polar bonds must cancel out. You need to look for the most symmetric structure (and the one where the C-Cl bonds are in the same direction with opposite signs).
I see so would it be A as the polar bonds are attached to the same Cabon atom on the C=C double bond, therefore would cancel out?
Does the shape of the molecule affect polarity?
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