Out of but-1-yne or but-1-ene which has higher dipole moment?

Explanation

The dipole moments of but-l-ene and but-1-yne are shown below:

The resultant dipole moment of but-1-ene and but-1-yne is due to the dipole moment of `CH_(3)CH_(2)-C` and C-H bonds which oppose each other. Since a sp-carbon is more electronegative than a sp carbon, therefore polarity of `CH_(3)CH_(2)(sp^(3)) -C(sp)` bond in but-1-yne is more than that of `CH_(3)CH_(2)(sp^(3)) -C(sp^(2))` bond in but-1-ene. Thus, the dipole moment of but-1-yne is more than that of but-1-ene.