Organic Chemistry 8
Chemistry
Level
3
Assertion - Trans form of 1,2 dimethyl cyclo propane is more stable than cis form .
Reason- Torsional Strain Is lesser in trans form of 1,2 dimethyl cyclopropane .
assertion and reason are correct , but reason is not correct explanation of assertion
Reason is correct but assertion is incorrect
Asseration is correct , but reason is incorrect
assertion and reason are correct , and reason is correct explanation of assertion
Both assertion and reason are incorrect
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1 solution
If we draw the newmann's projection of the molecule it will only exist in eclipsed form because rotation is not possible . but in trans form the two methyl groups will be at an angle of 60 degrees to each other minimising the repulsion but in cis they will be parallel to each other maximising repulsion . The torsional strain in the two forms will be same as torsional angle for both forms will be 0 degrees. the reason would be steric strain which is responsible for the difference in stability of cis and trans form .hence assertion is correct and reason is incorrect