Linked Questions

-1
votes
1answer
2k views

Conditions for Chirality in optical isomerism [duplicate]

Is it necessary that any atoms which is chiral must have 4 different atoms around the central chiral atom(maybe it can be carbon if it's organic molecule) bonded to it? More specifically: I mean can't ...
-3
votes
1answer
1k views

Is glycine achiral? [duplicate]

In this video (10:20>) the woman says that the Glycine is not chiral because it has 2 different group only rather than four. Then I can understand from her things that amino acid can be chiral just ...
0
votes
1answer
1k views

What is the difference between chiral molecule and chiral carbon? [duplicate]

I read in my book, that substituted allenes do not have chiral carbons, but actually the molecule is chiral, so they show optical isomerism. But what is the difference between them( chiral carbon and ...
0
votes
3answers
87 views

What exactly is a 'chiral centre' in a carbon compound? [duplicate]

The typical progression (in books, YouTube videos) of explanation of chiral carbons in a compound is as follows: Chiral compounds are non-superimposable by their mirror-image; It is easily seen that ...
23
votes
6answers
25k views

Chirality of symmetrically substituted biphenyl

I am facing trouble with the following problem: is 2,6-dimethyl-2',6'-dinitro-1,1'-biphenyl chiral? My idea is that there is a axis of symmetry along the line joining the two benzene molecules. Hence ...
10
votes
3answers
4k views

Which biphenyl is optically active?

Which biphenyl is optically active? I know that it can never be 1. I don't think it will be 4 either as I read that it should be ortho-substituted biphenyl. So, when I look at 2 and 3, I can't make ...
5
votes
2answers
6k views

Are molecules chiral if a rotation leads back to the same compound?

I understand that if you rotate a molecule and it has the same configuration as its enantiomer, then it is indeed the same compound as the enantiomer (meso), and hence is achiral (despite having ...
7
votes
2answers
2k views

How to identify the asymmetric carbon in [4-(1-bromoethylidene)cyclohexyl]acetaldehyde? [duplicate]

How to identify an asymmetric carbon in the molecule below? Is the carbon identified by the asterisk asymmetric or not? I would say no as it has no 4 different groups attached. Is this correct? I ...
13
votes
1answer
880 views

What are the criteria for a molecule to be chiral?

What are the criteria for a molecule to be chiral? (We frequently get questions of this type, so this is an attempt to construct a suitable general answer for duping.)
1
vote
2answers
3k views

Why was the definition of chiral carbon changed?

Before 1984, the definition of chiral carbon was, carbon atom that is attached to four different types of atoms or groups of atoms In 1984, the definition was changed to Any carbon molecule ...
4
votes
2answers
952 views

Chiral carbon in carvone molecules

This is the structure of carvone, with the chiral carbon noted by *. I don't understand why this is a chiral carbon, to my understanding a chiral carbon is a carbon with 4 different chemical groups ...
3
votes
1answer
135 views

Is the existence of chirality center equivalent to chiral?

To make my question more clear, I want to ask two questions: Is it possible for molecule to be achiral even though molecule has chirality center? Is it possible for molecule to be chiral even though ...
0
votes
0answers
255 views

Difference between chiral and stereogenic centre?

I've seen in some books where they state all chiral centres are stereogenic centres, but not the other way around. Is "chiral centre" related to only to optical isomerism and "stereogenic centre" ...
-3
votes
1answer
81 views

If 360 rotation is possible, How Molecule exist with particular Configuration

I Have confusion, If we talk about Ethane Molecule, we can get different conformations. For ethane, the eclipsed and staggered are freely inter-convertible and in between these two extreme ...
0
votes
2answers
120 views

Is plane of symmetry a necessary and sufficient condition for optical inactivity in coordination compounds? [closed]

In organic chemistry, we have to check for all three types of symmetry in a compound to check its chirality, ie, plane, alternate axis and centre of symmetry. But in coordination compounds, do we need ...