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Solution


Q.

The incorrect statement regarding the geometrical isomers of 2-butene is:                             [2024]
1 trans-2-butene is more stable than cis-2-butene.  
2 cis-2-butene has less dipole moment than trans-2-butene.  
3 cis-2-butene and trans-2-butene are not interconvertible at room temperature.  
4 cis-2-butene and trans-2-butene are stereoisomers.  

Ans.

(2)

(1) Due to repulsion between more bulky methyl groups, cis-but-2-ene is less stable than trans but-2-ene.

(2) 

      Bond moments in trans but-2-ene cancel out to give zero net dipole moment.

(3) Free rotation around C = C is not possible at room temperature, hence cis-but-2-ene and trans-but-2-ene are not interconvertible at room temperature.