Chemistry - STEREO ISOMERISM Question with Solution | TestHub
Identify which of the compounds show geometrical isomerism?
1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 
10. 
11. 
12. 
Options:
Answer:
Solution:
1. Yes : C-3 and C-4 of the cyclobutene ring each bear H and a different alkyl group, so cis-trans isomers exist.
2. Yes : the internal C=C bond (C-5/C-6) carries two different groups on each carbon.
3. No : both Cl atoms are on the same ring carbon.
4. Yes : cis-trans isomerism about the cyclobutane ring.
5. Yes : cis-trans isomerism about the cyclopentane ring.
6. No : only one substituent on the ring.
7. No : the CH₃-bearing carbon is the only stereogenic centre (optical isomerism only); the ring double bond can only be cis.
8. Yes : cis-trans isomerism about the cyclopentane ring.
9. No : no substituents and the ring double bond can only be cis.
10. No : the CH₃-bearing carbon is the only stereogenic centre (optical isomerism only); the ring double bond can only be cis.
11. Yes : a ring of 8 or more carbons can accommodate both cis and trans double bonds.
12. Yes : cyclooctene exists as cis and trans isomers.
