Question

Ethanol is prepared industrially by

• A. Hydration of ethylene
• B. Fermentation of sugars
• C. Both the above
• D. None of these

Answer 1

Answer: (C)

Hydration of ethene
$C{H}_2=C{H}_2+\stackrel{+}{H}HS\stackrel{-}{O_4}\to C{H}_3-C{H}_2-HS{O}_4$
$C{H}_3-C{H}_{2}HS{O}_4\underset{Boil}{\overset{H_{2}O}{\to }}C{H}_3-C{H}_2-OH+H_{2}S{O}_4$
Fermentation of sugars:
$C_{12}{H}_{22}{O}_{11}+H_{2}O\stackrel{\text{Invertase}}{\to }\underset{\text{Glucose}}{C_6{H}_{12}{O}_6}+\underset{\text{Fructose}}{C_6{H}_{12}{O}_6}$
$\underset{\text{Glucose or Fructose}}{C_6{H}_{12}{O}_6}\stackrel{\text{Zymase}}{\to }2C_2{H}_{5}OH+2C{O}_2$