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Question:

The group having triangular planar structures is: NCl3, BCl3, SO3, CO2, NO, BF3, NF3, NH3

CO2, NO, SO3

NCl3, BCl3, SO3

NH3, SO3, CO2

BF3, NF3, CO2

Solution:

The group having triangular planar structures is CO2, NO, SO3.

In CO2, the C atom is sp hybridized. This results in a linear structure, not a triangular planar structure.
In NO, the N atom is sp hybridized. This results in a linear structure, not a triangular planar structure.
In SO3, the S atom is sp2 hybridized. This results in a triangular planar structure.

Therefore, only SO3 has a triangular planar structure among the given options. The other options are incorrect because they include molecules that do not have triangular planar structures.