All Questions
Tagged with optical-properties stereochemistry
36
questions
3
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813
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Would Z and E isomers show different optical activity?
Consider this compound, which is in E-configuration and that red asterisk denotes the chiral carbon. If I were to somehow cause the E-configuration of the alkene part to Z-configuration keeping the ...
- 484
3
votes
2
answers
197
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Chirality and Optical activity
Do all chiral objects rotate the plane of polarization of EM waves? For example my hand is chiral, will it rotate the plane of polarization of EM waves of suitable wavelength?
user102687
3
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0
answers
75
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Does optical isomerism fall under the category of stereoisomerism?
I have been asked to find the total number of dichlorination products (including stereoisomers) for the following reaction:
I have figured out nine possible structures out of which two are optically ...
- 462
2
votes
1
answer
633
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How does Entropy influence the racemization of an optically active compound?
We were doing the topic "Isomerism" in our Organic Chem class and there's a question in our worksheet whose answer I haven't really understood, the question is as follows:
The racemization ...
- 133
2
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1
answer
840
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How many stereoisomers can exist for 4,5-bis(3-hydroxyoct-1-en-1-yl)cyclopentane-1,3-diol?
Q.10 For the given compound $\ce{X}$, the total number of optically active stereoisomers is ____.
This is from JEE Advanced 2018 second question paper.
I thought the answer to be at least 32 because ...
- 754
2
votes
1
answer
2k
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How do we identify left handed and right handed crystals?
I was going through this article about how Louis Pasteur studied and explained the absence of optical activity in Racemic acid. Here's an extract:
When Pasteur next examined crystals of the same
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- 1,091
1
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1
answer
232
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Doubt in chirality and pseudo chirality
So a carbon atom is chiral if it has 4 different group attached to it, and it is pseudo chiral if it has 3 different groups of atoms attached to it, where the 2 similar groups have different ...
- 169
1
vote
1
answer
48
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When to permute two times to find optical configuration [closed]
I'm learning about S and R configuration, and I know that in case where the 4th substituant is not behind we should permute it with the one which is behind. then we find the new configuration and use ...
- 21
1
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2
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Can diastereomers form a racemic mixture?
In my book, it says racemic mixture is the mixture of + and - optical isomers and it is optically inactive. This means enantiomers (optical isomers which are mirror images to each other) can form ...
- 131
0
votes
2
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5k
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Meso and achiral does both term means the same?
When a molecule has plane of symmetry, or centre of symmetry it is termed as an achiral compound (though it contain some chiral centres). Same goes for the meso compounds due to the internal ...
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0
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2
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72
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Optical activity of (1r,3R,5S)-3,5-dimethyl-4-methylidenecyclohexan-1-ol
Could anyone explain why compound L is not optically active?
- 21
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1
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2k
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Which are the Geometrical isomers of the complex [Cr(NH3)2Cl2(en)]+?Is it one or two?
I was recently studying coordination compounds and i came across optical isomerism shown by complexes.I think that the complex i gave above have 4 geometrical isomers(I think this is where I am wrong, ...
0
votes
1
answer
223
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Which of the following isomers of 2,3‐dihydroxy‐4‐methoxy‐4‐oxobutanoic acid are identical?
Which of the following are identical?
A and B are identical
A and B are diastereomers
A and C are enantiomers
A and B are enantiomers
What I know is that when we rotate a Fisher projection by 180°, ...
- 371
0
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0
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1k
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What are the limitations of the D, L system and the (+), (-) system for naming organic compounds
In organic chemistry, both the D, L system and the (+), (-) system are widely used, in conjunction with the modern (R, S) system.
The D, L system names an organic molecule based on the direction that ...
- 99
0
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0
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525
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Are centre of symmetry(COS) and alternate axis of symmetry(AAOS) dependent on each other?
COS=Centre of symmetery
AAOS=Alternate axis of symmetry
Lets suppose a molecule has a COS. Does it need to have AAOS?
What about the converse? If a molecule has AAOS does it necessarily have a COS?
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