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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