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Organic Chemistry

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17 Jan 2007 15:03:34 IST

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924

stereo

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total no of stereoisomers possible for

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

and plz with full explanation

Comments (7)

nibin89

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Joined: 17 Jan 2007

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18 Jan 2007 18:34:58 IST

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

smriti.mathur

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18 Jan 2007 22:45:45 IST

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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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20 Jan 2007 01:02:28 IST

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*********************Deleted for unacceptable language**********************

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

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20 Jan 2007 19:55:32 IST

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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

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21 Jan 2007 00:52:15 IST

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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

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23 Jan 2007 13:33:53 IST

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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

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Joined: 24 Jan 2007

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24 Jan 2007 17:08:58 IST

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

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