The stream of hexane does not bend when the negatively charged rod gets close to it because the molecule is nonpolar.
A molecule may be polar or nonpolar. A polar molecule has a partially positive end and a partially negative end.
Hexane is a nonpolar molecule. It does not have a positive end or a negative end. Charges are equally distributed between the atoms in the molecule.
As a result of that, hexane does not bend when the negatively charged rod gets close to it.
The structure of hexane and a molecular model of hexane is attached to this answer.
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