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Karnataka Board PUCPUC Science 2nd PUC Class 12

Commercially Important Alcohols

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Estimated time: 3 minutes
CBSE: Class 12

Key Points: Commercially Important Alcohols

Methanol (Wood Spirit):

  • Produced by catalytic hydrogenation of CO: 

    \[\ce{CO + 2H2  ->[ZnO/Cr2O3, 200-300atm, 573-673K] CH3OH}\]

  • Highly poisonous; used as a solvent in paints and varnishes.

Ethanol:

  • Produced by fermentation of sugar: 

    \[\ce{C12H22O11 + H2O ->[Invertase] \underset{Glucose}{C6H12O6} + \underset{Fructose}{C6H12O6}}\]

  • Used as a solvent and in the preparation of carbon compounds.

Differentiation between Methanol & Ethanol:

  • Iodoform test: Ethanol gives yellow ppt (CHI₃); methanol gives no reaction.

  • With salicylic acid + H₂SO₄: Methanol forms methyl salicylate (characteristic odour); ethanol gives no specific odour.

Video Tutorials

We have provided more than 1 series of video tutorials for some topics to help you get a better understanding of the topic.

Series 1


Series 2


Shaalaa.com | Alcohol, Phenol and Ether part 17 (Alcohol Numerical)

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Alcohol, Phenol and Ether part 17 (Alcohol Numerical) [00:22:00]
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