A) Phenol is more acidic than acetic acid
B) Ethanol is less acidic than phenol
C) Ethanol has lower boiling point than ethane
D) Ethyne is a non-linear molecule
Correct Answer: A
Solution :
Phenols are much more acidic than alcohols but less so than carboxylic acids or even carbonic acid. This is indicated by the values of ionisation constants. The relative acidity follows the order: \[{{K}_{a}}\,\,\underset{RCOOH}{\mathop{{{10}^{-5}}}}\,>\underset{{{H}_{2}}C{{O}_{3}}}{\mathop{{{10}^{-7}}}}\,>\underset{{{C}_{6}}{{H}_{5}}OH}{\mathop{{{10}^{-10}}}}\,>\underset{HOH}{\mathop{{{10}^{-14}}}}\,>\underset{ROH}{\mathop{{{10}^{-18}}}}\,\]
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