The boiling point (in $\mathrm{K}$ ) of cis but-2-ene and dipole moment (in $\mathrm{D}$ ) of trans but- 2 -ene are respectively

In cis-isomer, both the bulky groups are present on the same side, hence it has a dipole moment, (which gets cancelled out in case of trans).

Boiling point depends upon intermolecular interactions which is more in cis than trans due to its net dipole moment.

Boiling point of cis but-2-ene is $277 \mathrm{K}$ and dipole moment of trans but-2-ene is $0.00 \mathrm{D}$