Question
Question: When Butan-2-ol is dehydrated using sulphuric acid, the concentration of acid and temperature needed...
When Butan-2-ol is dehydrated using sulphuric acid, the concentration of acid and temperature needed respectively is
A
60% conc. and 373 K
B
95% conc. and 373 K
C
20% conc. and 363 K
D
20% conc. and 373K
Answer
95% conc. and 373 K
Explanation
Solution
Dehydration of butan‑2‑ol requires a strongly concentrated acid (to minimize water and favor the formation of a carbocation) along with heating. A high concentration (around 95% H₂SO₄) is used so that water is minimized, thus favoring elimination over substitution. The optimal temperature for the reaction is around 373 K (100 °C) to provide sufficient energy for the reaction without causing side reactions.