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)
(1996, M)
(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:
- $p$ -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.
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)
BETA
