Some oxidation reactions of methane are given below. Which of them is/are controlled oxidation reactions?

(i)CH_{4}+2O_{2}\rightarrow CO_{2}(g)+2H_{2}O(l)

(ii)CH_{4}+O_{2}\rightarrow C(s)+2H_{2}O(l)

(iii)CH_{4}+O_{2}\overset{M_{2}O_{3}}{\rightarrow}HCHO+H_{2}O

(iv)2CH_{4}+O_{2}\xrightarrow[Cu/523]{K/100atm}2CH_{3}OH

 

 

 

Answers (1)

The answer is the option (iii)CH_{4}+O_{2}\overset{M_{2}O_{3}}{\rightarrow}HCHO+H_{2}O and

(iv)2CH_{4}+O_{2}\xrightarrow[Cu/523]{K/100atm}2CH_{3}OH

Explanation: When combustion takes place in an insufficient supply of oxygen or air, water and carbon black are formed. Therefore, alkanes are heated with a regular supply of oxygen or in a controlled way to give HCHO and CH_{3}OH.

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