Isomerism
I have a few doubts, I find it very confusing.
Are all optically active compounds chiral?
or are all chiral compounds optically active?
Are stereoisomers the same as optically isomers?
42 Replies
@Dexter
Note for OP
+solved @user to close the thread when your doubt is solved. Mention the user who helped you solve the doubt. This will be added to their stats.all chirally compounds aren't optically active depends if they have a symmetry or not
hmmmm
also how do you calculate stereroisomerism in a ring structure
how many stereoisomers does this have?
- stereoisomers
- geometrical isomers
- optical isomers
Can someone relate these three terms?
@iTeachChem sir help kardo please ðŸ˜
i think i can help
stereoisomers is a borader concept
Under it is geometrical and optical isomers
so
geo isomers have cis and trans
and optical isomers have enantiomers and diastereomers?
geo isomers have cis trans E/z and Syn anti
i see
and how do you calculate the number of stereoisomers for a compound?
i think we drew fishcer diagrams the memory is a bit fuzzy
for example how do you calculate that for ths
@Gamertug
ðŸ˜
tbh i forgot
https://www.youtube.com/watch?v=n08jgC-P7ik
watch at 3:13 and onwards , exact same question
2 chiral centres so 4?
btw organic ke liye you folks are better off tagging Nimay than me 😄
so what about 1bromo 4chloro cyclohexane then?
ohh
but if you just rotate the structure, you can get the other structure isnt it
like anti configuration where Cl is dark and Br is dashed. rotate it and you get the opposite anti structure. so hows that counted as 2 isomers?
huh mujhe smjh nhi aaya what did u just say
wait did u just say 1,4 or 1,3. wait i did wrong normecleature
1,4
also which is more acidic in this, A or B?
B due to better resonance
how B?
can you show the resonance structures
A also undergoes resonance with oxygen
In fact theres more conjugation in A
very extended in A
yes show shouldnt A be more stable and therefore more acidic?
yes
sakshi vora said B is more stable in her lecture tho 💀
ye batao mujhe have i done something wrong. mere hisaab se B hi hona chaiye
Sakshi vora ko kon dekhta hai yaar hum @iTeachChem ko dekhte hai
A can perform extended conjugation while B can only perform cross-conjugation ; to answer A hi hona chahiye
oh right 💯
Bro can u please tell any fault in my reso structures
read book dude. and what these guys are saying, i trust that more.
can i mark this as solved? @idk
not just yet
what she said was B me carbon par negative aata hai 2 baar uske baad O par negative aata hai
and since carbon isnt as electronegative as oxygen, it is more unstable compared to A
in A, oxygen par direct negative aata hai
is this reasoning correct?
Nope
There's no such thing as speed in resonance. In reality resonating structures don't exist and the delocalized electrons are in a cloud.
in the end, the oxygen is gonna get the negative charge one way or the other.
Wrong
2 factors which make resonance effective are qualitative factor (negative charge on a highly electronegative element) and quantitative factor (extended conjugation)
Quality dominates quantity (fax)
So if in both cases quality same hai (oxygen pe negative) the next best thing you can check is which has more conjugation (quantitative factor)
Resonance is distance independent meaning the effect won’t decrease upon increase in distance (unless there is some sort of cross conjugation or counter resonance coming into play) which explains why extended conjugation makes resonance more effective since there are more resonating structures
A has 4 resonance structures
B has 3 resonance structures
But in A, two of the resonance structures have the negative charge on a less electronegative carbon atom
In B, there's only one resonance structure that has a negative charge on carbon
as you said, quality dominates in B
??
By that logic extended conjugation should be bad
also true
understood
+solved
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+solved @user. This will be added to their stats.+solved @!Nimay¡
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