Question

# Which of the following is polar?

A
BF3
B
C3H5F
C
CO2
D
CH4

Solution

## The correct option is B $$C_3H_5-F$$Compounds having symmetrical geometry do not possess any permanent dipole moment. They do not possess any hetero atom.1.$$BF_{3}$$ has a trigonal planar structure. Resultant bond moment of two $$B-F$$ bond gets cancelled out by the third one. The net dipole moment is zero.2, $$CO_{2}$$ has a perfect linear shape. So it is obvious that it has no dipole moment.3. $$CH_{4}$$ has a perfect tetrahedral shape. So resultant of three $$C-H$$ bond gets cancelled by the fourth one.Only in case of $$C_{3}H_{5}-F$$ compound has one hetero atom fluorine. So the dipole moment of this compound is non zero. Hence, option B is correct.Chemistry

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