How do I calculate the energy difference between these cis and trans molecules a

Question

How do I calculate the energy difference between these cis and trans molecules and what would the difference in energy be?

Question 35 Consider the structures of cis-1,2-dimethylcyclopropane and trans-1,2-dimethylcyclopropane Correct. Which compound would you expect to be more stable? Explain your choice. hyl eclipsing interaction The trans isomer is expected to be more stable, because the other isomer has a very high energy methyl-met very high energy methyl-methyl eclipsing SHOW ANSWER Incorrect. Predict the difference in energy between these two compounds. The difference between these two isomers is therefore predicted to be 5 kJ/mol.

Explanation / Answer

in cis and trans angle strain and steric strain both are same in both conformation

except steric strain

in trans there is no methyl methyl steric interaction

where as in cis this CH3-CH3 interaction is there

these two CH3 groups are in eclipsed position

so CH3-CH3 eclipsing interaction is 3.4 kcal/mol or 14.22 kJ/mol

so difference will be

14.22 kJ/mol

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