The independent variable when comparing the boiling point of substances having different intermolecular forces is the intermolecular forces of various substances (Option a).
The expression 'intermolecular forces' make reference to the bonds that bind different atoms in macromolecular structures and thus also serves to shape the form of macromolecules.
In conclusion, the independent variable when comparing the boiling point of substances having different intermolecular forces is the intermolecular forces of various substances (Option a).
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