Problem: Indicate whether each of the following molecules are capable of geometrical (cis-trans) isomerism.A) 1,1-dichloro-1-buteneB) 2, 4-dichloro-2-buteneC) 1,4-dichloro-benzeneD) 4, 5-dimethyl-2-pentyne

FREE Expert Solution

Cis-trans isomerism applies to molecules with an alkene group (double bond).

To identify whether the molecules are capable of geometrical (cis-trans) isomerism, we need to see if the structure has higher priority groups on each carbon of the double bond. 


Draw each structure and highlight the priority groups. 

A) 1,1-dichloro-1-butene


  • We have identical substituents on one-carbon (Cl). 
  • This means it is NOT capable of cis/trans isomerism. 


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Problem Details

Indicate whether each of the following molecules are capable of geometrical (cis-trans) isomerism.

A) 1,1-dichloro-1-butene

B) 2, 4-dichloro-2-butene

C) 1,4-dichloro-benzene

D) 4, 5-dimethyl-2-pentyne

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