Which of the following molecule has highest dipole moment?

Options

A. `BF_(3)`
B. `NH_(3)`
C. `NF_(3)`
D. `B_(2)H_(6)`

Answer

b

Explanation

` BF_(3)` is triangular molecule `(BH_(3))` , therefore , both of
these have zero dipole moment ` NH_(3) " and " NF_(3)` , on
the other hand have pyramidal structrues and thus have dipole moments .

In ` NH_(3) `, the dipole moments of the three N-H bonds
reinforce the dipole moment due to lone pair of
electrons but in ` NF_(3)` , the dipole moments of the three
N-F bonds oppose the dipole moment due to lone
pair of electrons . As a result , dipole moment of ` NH_(3)`
` (mu = 1.46 D )` is higher than that of ` NF_(3) (mu = 0.24 D )`.