IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry

lonelyguy

total no of stereoisomers possible for

CH(Cl)==C(Cl)---CH(Cl)----- C(Cl)==CH(Cl)

and plz with full explanation

nibin89

i think there is only one chiral carbon there.
so ans will be 2^1=2.

smriti.mathur

Total no. of Geometrical isomers would be four- trans-trans, trans-cis, cis-cis and cis-trans, depending on the position of Cl groups as being on the same or opposite side of the two double bonds.

lonelyguy

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IGOT TO TELL U THAT STEREO ISOMERS ARE'NT THOSE KNOWN AS GEOMETRICAL ONE ONLY ......FIRST MISTAKE SECOND .............NUMBER OF GEOMETRICAL ISOMER DOES'NT MATCH AT ALL AS ........CIS-TRANS =TRANS-CIS (IF I AM TACKING ABOUT GEOMETRICAL ONES) EBE

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smriti.mathur

Hey lonelyguy,

Making arrogant remarks such as these doesn't suit an honest student.

I never mentioned that geometrical isomers are the only stereoisomers, did I? and secondly trans-cis and cis-trans would mean same if there is only one double bond in the compound. In case of compounds having more than one double bond, trans-cis and cis-trans are two different isomers when the double bonds are dissimilarly substituted.

lonelyguy

In case of compounds having more than one double bond, trans-cis and cis-trans are two different isomers when the double bonds are dissimilarly substituted. ..................yes i agree with this .....................but if the positions are dissimilar in this case cis-trans and trans-cis are going to be same here but here these are going to be OPTICAL ISOMER as the central carbon atom will become chiral if one double bond positioned itself in cis and another in trans but the no of geometrical isomers for this compound is 2 and no of stereo isomer 4

fundoonikhil

no of optical isomers are 0.there's no chiral carbon(sp3 hybridised C with all 4 gps. different).

and i think geometrical isomers are 2.
So total stereoisomers are 2.

rahul_singhani

i think there is 3 chiral carbon there.
so ans will be 2^3=8.isomers

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