Kalabamboo
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Can somebody please help with this?
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charco
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(Original post by Kalabamboo)
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Can somebody please help with this?
What don't you understand?

The markscheme gives you the explanation.
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Kalabamboo
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(Original post by charco)
What don't you understand?

The markscheme gives you the explanation.
Only one of the carbons in ethanal has three groups of electrons with no lone pairs so why is ethanal a planar molecule? The other carbon has 4 groups of electrons with no lone pairs making it tetrahedral?
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charco
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(Original post by Kalabamboo)
Only one of the carbons in ethanal has three groups of electrons with no lone pairs so why is ethanal a planar molecule? The other carbon has 4 groups of electrons with no lone pairs making it tetrahedral?
The geometry is planar around the carbonyl carbon.
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Kalabamboo
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(Original post by charco)
The geometry is planar around the carbonyl carbon.
So if the geometry is planar around the carbonyl carbon then ethanal is therefore planar because the carbonyl group is the main functional group? So generally the geometry of a molecule is based on the carbon in its main functional group?
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charco
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(Original post by Kalabamboo)
So if the geometry is planar around the carbonyl carbon then ethanal is therefore planar because the carbonyl group is the main functional group? So generally the geometry of a molecule is based on the carbon in its main functional group?
No, it's about relevance.

The methyl group is three dimensional, but not involved in the mechanism, whereas the carbonyl group is the focus of the mechanism and its planarity is absolutely essential to appreciate the question.
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Kalabamboo
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(Original post by charco)
No, it's about relevance.

The methyl group is three dimensional, but not involved in the mechanism, whereas the carbonyl group is the focus of the mechanism and its planarity is absolutely essential to appreciate the question.
Ah I see what you mean in the context of this question.

But if the question was solely asking what shape is ethanal, then there isn't a possible answer because one carbon in ethanal is tetrahedral and the other carbon is trigonal planar?
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charco
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(Original post by Kalabamboo)
Ah I see what you mean in the context of this question.

But if the question was solely asking what shape is ethanal, then there isn't a possible answer because one carbon in ethanal is tetrahedral and the other carbon is trigonal planar?
... and so it wouldn't be asked.
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Kalabamboo
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(Original post by charco)
... and so it wouldn't be asked.
Thanks
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Himsara
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hi
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