Asked by adityaduhanomprakash | 22nd Aug, 2010, 12:18: AM

Expert Answer:

Cis and trans isomers are a special type of geometrical isomers found in alkenic systems in which it is possible for each of the doubly bonded carbons to carry two different atoms or groups
 cis means "on the same side" and trans means "on the other side" or "across". 

When the substituent groups are oriented in the same direction, the diastereomer is referred to as cis, whereas, when the substituents are oriented in opposing directions, the diastereomer is referred to as trans.

For example  but-2-ene.

In one case, the CH3 groups are on opposite sides of the double bond, and in the other case they are on the same side.



Answered by  | 22nd Aug, 2010, 08:24: AM

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