Calculate the total number of cyclic isomeric carbonyl compounds of molecular formula C5H8O which can't show geometrical isomerism?

1 Answer
Ernest Z.
May 8, 2018

I count six isomers that satisfy your criteria.

Explanation:

There are two types of configurational stereoisomers:

  • cis-trans isomers

  • optical isomers

Here are the cyclic isomeric carbonyl compounds with molecular formulas that can't show geometrical isomerism.

We start with the cyclic alkanes and then put a carbonyl group in all possible locations.

(a) From cyclopentane

Cyclopentanone

(b) From methylcyclobutane

3-methylcyclobutanone

2-methylcyclobutanone

cyclobutanecarbaldehyde

(c) From 1,1-dimethylcyclopropane

2,2-dimethylcyclopropanone

(1-methylcyclopropane)carbaldehyde

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