Q.

The increasing order of boiling points of the following compound is

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a

IV < I < II < III

b

I < III < IV < II

c

I < IV < III < II

d

III < I < II < IV

answer is B.

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Detailed Solution

I)  P-cresol                          202ºC

II) P-nitro phenol                279ºC

III) P-aminophenol             284ºC

IV) P-methoxy phenol        243ºC

Due to hydrogen bonding B.pt of P-amino phenol is high in other cases grater the ‘u’, greater is the B.pt III > II > IV > I

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