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Why Cis-But-2-ene posseses dipole moment while Trans-But-2-ene have zero dipole moment ?

  We know that But -2- ene It exists in two forms Cis-But-2-ene and Trans-But-2-ene

                      
SOLUTION: The Trans isomer is symmetrical with the 2-methyl groups in anti position. So the bond dipoles the two Me– C bonds acting in opposition cancel each other and result in a zero dipole. Where as in cis isomer the dipoles do not cancel each other resulting in a net dipole
 

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