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Which has least dipole moment But-2-ene But-2-yne

Which has least dipole moment
 
But-2-ene
But-2-yne
 

Grade:11

1 Answers

Aarti Gupta
askIITians Faculty 300 Points
6 years ago
Least dipole moment between but-2-ene and but-2-yne will be but-2-yne.This is due to the symmetrical nature of but-2-yne which leads to its dipole moment zero.Alhough alkynes have more dipole moment due to 50% s-character so more electronegativity constituting more dipole moment and alkenes have 33% s-character thus less electronegativity and less dipole moment.

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