Final answer:
The only molecular structure from the given options that can accommodate a trans C=C bond is the trigonal planar structure (option c).
Step-by-step explanation:
The question is asking which of the given molecular structures could accommodate a trans C=C (trans double bond). The presence of a trans double bond requires a molecular geometry that allows for the two substituents to be on opposite sides of the double bond plane. Among the options given:
- Tetrahedral - This has angles of 109.5 degrees and doesn't allow for trans arrangment due to its three-dimensional shape.
- Trigonal planar - This has a flat, three-sided shape with 120-degree angles and can have trans arrangments as its substituents lie in a plane.
- Square planar - This also allows for substituents to lie opposite each other in a plane, though it is not mentioned in the context of C=C double bonds.
- Trigonal bipyramidal - This structure has atoms in different planes, with no trans arrangement possible for a C=C bond as found in linear or planar geometries.
Thus, the only molecular structure that can accommodate a trans C=C bond from the given options is trigonal planar (c).