Chemical Bonding - Result Question 107

####6. Arrange the following compounds in order of increasing dipole moment, toluene (I), m-dichlorobenzene (II), o-dichlorobenzene (III), p-dichlorobenzene (IV)

(a) I < IV < II < III

(b) IV < I < II < III

(c) IV < I < III < II

(d) IV < II < I < III

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Answer:

Correct Answer: 6. (b)

Solution:

  1. p-dichlorobenzene is non-polar.

The two dipole vectors cancelling each other giving zero resultant dipole moment. o-dichlorobenzene has greater dipole moment than meta-isomer.

(o-dichlorobenzene) dipole vectors are at 60 angle

( m-dichlorobenzene) dipole vectors are at 120 angle Toluene is less polar than both ortho and para dichlorobenzene. Therefore, the increasing order of dipole moment is

p-dichlorobenzene (IV) < toluene (I) <m-dichlorobenzene (II)

<o-dichlorobenzene (III)



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