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Arrange the following compounds in order...

Arrange the following compounds in order of increasing dipole moment:
(I) Toluene
(II) m-Dichlorobenzene
(III) o-Dichlorobemzene
(IV) p-Dichlorobenzene

A

I lt IV lt II lt III

B

IV lt I lt II lt III

C

IV lt I lt III lt II

D

IV lt II lt I lt III

Text Solution

Verified by Experts

The correct Answer is:
B
The correct order of increasing dipole moment is
p-dichlorobenzene < Toluene < m-dichlorobenzene < o-dichlorobenzene.
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Polar covalent molecules exhibit dipole moment. Dipole moment is equal to the product of charge separation , q and the bond length d for the bond. Unit of dipole moment is debye. One debye is equal to 10^(-18) esu cm. Dipole moments is a vector quantity. It has both magnitude and direction. Hence, dipole moment of a molecule depends upon the relative orientation of the bond dipoles, but not on the polarity of bonds alone. A symmetrical structure shows zero dipole moment. Thus, dipole moment helps to predict the geometry of a molecules. Dipole moment values can be distinguish between cis- and trans- isomers, ortho, meta and pare-forms of a substance, etc. Q. Arrange the following compounds in increasing order of dipole moments, toluene (I), o-dichlorobenzene (II), m-dichlorobenzene (III) and p-dichlorobenzene (IV) :

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ERRORLESS-CHEMICAL BONDING AND MOLECULAR STRUCTURE-NCERT BASED QUESTIONS (Dipole Moment)
  1. In a polar molecule , the ionic charge is 4.8 xx 10^(-10) esu. If the ...

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  2. If the molecule of HCl were totally polar, the observed value of dipol...

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  3. Given : Dipole moment of HCl=1.03 D Bond length =127pm Dipole mom...

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  4. The dipole moment of chlorobenzene is 1.73 D . The dipole moment of p-...

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  5. Dipole-dipole forces act between the molecules possessing permanent di...

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  6. Which of the following will show least dipole character ?

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  7. Which of the following would have a permanent dipole moment ?

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  8. Among the following the molecule possessing highest dipole moment is

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  9. Zero dipole moment is present in

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  10. The electronegaivity difference between N and F is greater than that b...

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  11. Fluorine is more electronegative than either boron or phosphorous. Wha...

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  12. N(2) is less reactive than CN^(-) due to

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  13. Which of the following fluorides of Xe has zero dipole moment ?

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  14. Dipole moment of is 1.5D. The dipole moment of

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  15. Dipole-dipole interaction energy between polar molecules in solids dep...

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  16. Arrange the following compounds in order of increasing dipole moment: ...

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  17. Polarity in a molecule and hence the dipole moment depends primarily o...

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  18. CO is practically non-polar since

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  19. The moecule with non-zero dipole moment is -

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  20. The molecule with the highest dipole moment among the following is

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