Bond Angle of NO2 is more than BCl3
@Siddhartha-Ghosh Since NO2 has an extra electron in an orbital on the nitrogen atom it will result in a higher degree of repulsions. However, if we take the one lone electron or the single-electron region there is less repulsion on the two bonding oxygen atoms. So the repulsions are not identical. As a result, the oxygen atoms are spread widely.
If we look at the structure, BCl3 molecular geometry is trigonal planar. The bond angle is 120o. The central atom also has a symmetric charge around it and the molecule is non-polar.