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Organic Chemistry

Blazing goIITian

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7 Apr 2009 12:41:42 IST

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327

solve the Q115 with explanation...rates assured...

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Prakhar Banga

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7 Apr 2009 12:54:20 IST

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The answer will be D-3.

On dehydration the following products are possible :

Cis alkene, which will give two enantiomers on reaction with Br2/CCl4

Trans alkene, which will give two meso compounds on reaction with Br2CCl4

Terminal alkene, which will give a single vicinal dibromide.

XYZ

Hot goIITian

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7 Apr 2009 12:58:21 IST

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Yes, the answer is (d)3. You'll get the answers if you consider cis-trans also.

tejas

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7 Apr 2009 13:02:41 IST

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plzz show with str. and figures....

sneha

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7 Apr 2009 13:02:50 IST

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yes I agree with 3774 answerer. The most stable product will be trans alkene I think

Siddhartha Gupta

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7 Apr 2009 17:00:49 IST

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Hang On....Is this according to the rule that Cis + anti addition gives Racemic mixture . . . & . . . Trans + anti-addition gives meso compd ...??Also , I understand that racemic mixture has the two compds ( laevo & dextro) but which are the two compds of meso ??

Prakhar Banga

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7 Apr 2009 17:10:34 IST

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Trans alkene on anti addition gives two meso compounds - which are optically inactive due to internal compensation. In a meso compound, two carbon consist of the same groups but both with different configuration. An example of a meso compound is this.

Br --- C --- CH3

Siddhartha Gupta

Blazing goIITian

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7 Apr 2009 18:11:20 IST

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The example of the meso compd you've given (3744answerer) is one compd only....it has 2^ (n-1) = 2^1 = 2 optical isomers ...so these optical isomers are considered as two separate compds...?? Rite??

Siddhartha Gupta

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8 Apr 2009 19:47:43 IST

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HellooooOO??

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