The compound CSe2 (carbon diselenide) is considered a nonpolar molecule.
To understand why CSe2 is nonpolar, we should look at its molecular geometry and the electronegativity of its constituent atoms. Carbon (C) is bonded to two selenium (Se) atoms. In a CSe2 molecule, the two Se atoms are positioned symmetrically around the carbon atom in a linear arrangement.
Although selenium is more electronegative than carbon, the symmetrical arrangement of the C-Se bonds means that the dipole moments created by each C-Se bond are equal in magnitude but opposite in direction. As a result, these dipole moments cancel each other out.
Furthermore, the overall molecular geometry of CSe2 is linear, leading to a balanced distribution of electron density across the molecule. Since there is no net dipole moment, CSe2 does not have the characteristics of a polar molecule.
In summary, due to its symmetrical linear structure and the cancellation of dipole moments, carbon diselenide (CSe2) is classified as a nonpolar compound.