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Q. Increasing order of dipole moment of following compoundsChemistry Question Image

TS EAMCET 2020

Solution:

Dipole moment is a quantity that describes two opposite charges separated by a distance. It is quantity that we can measure for a molecule in lab and thereby determine the size of partial charges on the molecule.
Among the given species, more closer the groups attached to the ring $\rightarrow$ show more dipole-moments then the species that has no second group attached to the ring. Hence, increasing order of dipole moment is
$(iv)< (i)< (ii)< (iii)$