The AX3 molecular structure (one central atom with three bonded atoms) can be non-polar even with bond dipoles present If there were no lone pairs on the central atom. Option 1 is correct.
The molecular structure or shape is a 3-D pattern showing the arrangement of atoms of a molecule.
The molecular structure of AX3 is said to be composed of a central atom connected and bounded to three atoms which are equally spaced at an angle of 120° towards one another. It has a shape of trigonal planar and its sp² hybridized that does not have any lone pair.
The polarity of a molecule or a compound has to do with the presence of lone pair in the central atom. Since AX3 has no lone pair of electrons in its central atom it is said to be non-polar.
Example of compounds that exhibit AX3 with no lone pair is: BF₃ and CO₃²⁻
Therefore, we can conclude that we've understood what is molecular structure and how to identify the molecular structures that are polar and non-polar in nature.
Learn more about polarity here:
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