When $Butan-2-ol$ is dehydrated using sulphuric acid,the concentration of acid and temperature needed respectively are:
- A$60 \% \ \text{conc. and } 373 \ K$
- B$20 \% \ \text{conc. and } 373 \ K$
- C$20 \% \ \text{conc. and } 363 \ K$
- D$95 \% \ \text{conc. and } 373 \ K$
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