Alcohols Phenols And Ethers Question 54
Question: Which is not correct
[J & K 2005]
Options:
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
Show Answer
Answer:
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_2CO_3}{\mathop{{10^{-7}}}}>\underset{C_6H_5OH}{\mathop{{10^{-10}}}}>\underset{HOH}{\mathop{{10^{-14}}}}>\underset{ROH}{\mathop{{10^{-18}}}} $
BETA
