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Referring to Parts A & B in the experiment, indica
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Polar and non polar nature of the compoud is decided based the electronegativity difference between the bonded atoms.

ionic compounds are polar and polar compouds have greter electronegativity difference between bonded atoms.

The bond between same atoms is nonpolar. In Non polar copoundes the bondeded aotms have nearly same electronegativity.

Ethylele glycol            POLAR.

Oil                               NONPOLAR

Biphenyl                     NONPOLAR

Hexane                      NONPOLAR

Sugar                          POLAR

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