Question

Find the number of stereoisomers for CH3 – CHOH – CH = CH – CH3.

Answer 1

Explanation:

Isomers 3 and 4 are a pair of enantiomers. Isomers 5 and 6 represent the same molecule because of an internal plane of symmetry. Isomers 7 and 8 are a pair of enantiomers. Thus, there are six optical isomers of CH3(CHOH)3CH3

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Answer 2

The total number of stereoisomers possible for the given compound will be 4

• In the given compound ( CH₃ – CHOH – CH = CH – CH₃), we have the presence of two stereocenters.
• Stereosentres are those centers (C molecule) that are attached to four different types of compounds.
• The formula for determining the number of stereocenters is:

                      Number of stereoisomers = 2ⁿ

Where n = number of stereocenters

• As the number of stereocentres in the given compound is 2, the formula will give us:

                         Number of stereoisomers = 2ⁿ = 2² = 4

Thus, the number of stereoisomers for CH₃ – CHOH – CH = CH – CH₃ will be 4.