Question

Draw the cis and trans isomers of 2-butene, CH3CHCHCH3. Show all hydrogen atoms?

Answer 1

Concepts and reason

Isomers are the compound that have same molecular formula but are not same or identical. The phenomena are known as isomerism. The cis-trans isomer is a type of stereoisomer in which molecular formula of compound is same but arrangement of atoms or groups in space is different. The cis-trans isomer is generated due to restriction in rotation around the double bond.

This question is based on isomerism, in which two isomers of 2-butene, that is, cis and trans is formed.

Fundamentals

The isomers are two types; conformational isomers and stereoisomers.

Those compounds that have same molecular formula but arrangement of atoms or groups in space is different are called stereoisomers. The stereoisomers are two types; configurational and conformational. The cis-trans isomers are comes under the configurational isomers. The cis-trans is used to designate the alkenes. The alkenes formed cis-trans isomers because of restriction in rotation around the double bond.

The cis-trans isomerism is shown by alkene of the type ${\rm{abC = Cab}}$ .

In cis isomer, the two same groups or atom are present on the same side of the double bond.

In trans isomer, the two same groups or atom are present on the opposite side of the double bond.

The structure of 2-butene is as follows:

The possible number of isomers structure of 2-butene is as follows:

Ans:

The cis and trans isomers of 2-butene is as follows: