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Q.

Which of the following is(are) explained by hydrogen bonding? 

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a

o-nitrophenol is less acidic than p-nitrophenol.

b

Me2NH  is more basic than Me3N in aqueous solutions.

c

pKal of cis isomer of but-2-enedioic acid is less than that of the trans isomer.

d

o-nitrobenzoic acid is more acidic than p-nitrobenzoic acid. 

answer is A, B, C.

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Detailed Solution

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A) Intramolecular hydrogen bonding decreases the acidic character of o-nitrophenol
B) Conjugate acid of  Me2NH has two hydrogen atoms that can involve in HB with water while that of  Me3N has only one.
C) Conjugate base of cis isomer is stabilized by intramolecular HB.
D) No HB in the conjugate base of o-isomer.

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Which of the following is(are) explained by hydrogen bonding?