Reagents used for industrial preparation of methanol are:

C O + H_{2}

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H C H O + H_{2}

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C O_{2} + H_{2}

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H C O O H + H_{2}

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Solution

The correct option is D $C O + H_{2}$
Carbon monoxide and hydrogen react over a catalyst to produce methanol. Today, the most widely used catalyst is a mixture of copper and zinc oxides,supported on alumina.At $5 - 10$ MPa ( $50 - 100$ atm) and 250 °C (482 °F), the reaction is characterized by high selectivity ( $> 99.8$ %).
$C O + 2 H_{2} ⟶ C H_{3} O H$

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