Question

Several alkene compounds are given below. Indicate

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Concepts and reason

The concept used is to identify whether each alkene compound can exist as stereoisomers.

Fundamentals

Stereoisomers are the isomers that have same molecular formula but differ only in the spatial arrangement of atoms.

Alkenes can exist as stereoisomers about the double bonds.

Cis/trans isomers are stereoisomers. E/Z isomers are stereoisomers.

If two identical groups are on the same sides of the double bond, then it is cis isomer.

If two identical groups are on the opposite sides of the double bond, then it is trans isomer.

cis-isomer
trans-isomer

If two high priority groups are on the same sides of the double bond, then it is Z isomer.

If two high priority groups are on the opposite sides of the double bond, then it is E isomer.

2
2
CI
ICH:
Z-isomer
E-isomer

a.

The given alkene is as follows:

H2CHC=CHCHZ

It can exist as cis/trans stereoisomers.

b.

The given alkene is as follows:

H3CHC=CBrCH CHz

It can exist as E/Z stereoisomers.

c.

The given alkene is as follows:

It cannot exist as stereoisomers.

d.

The given alkene is as follows:

It can exist as stereoisomers.

Ans: Part a

Yes, the given alkene can exist as stereoisomers.

Part b

Yes, the given alkene can exist as stereoisomers.

Part c

No, the given alkene cannot exist as stereoisomers.

Part d

Yes, the given alkene can exist as stereoisomers.

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Several alkene compounds are given below. Indicate if each compound can exist as stereoisomers. CH_3 CH...
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