Multiple choice

Methanol is prepared industrially by

  1. catalytic reduction of carbon monoxide in the presence of ZnO-Cr2O3

  2. reaction of methane with steam at 900°C with a Ni catalyst

  3. reduction of formaldehyde with lithium aluminium hydride

  4. reaction of formaldehyde with aqueous sodium hydroxide solution
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A Correct answer
Explanation

Methanol is industrially produced by catalytic hydrogenation of carbon monoxide (CO + 2H2 → CH3OH) under high pressure and temperature. ZnO-Cr2O3 is the catalyst used. Steam reforming of methane produces syngas (CO + H2), not methanol. LiAlH4 is too expensive for industrial use. Formaldehyde is an oxidation product of methanol, not a precursor.

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