Make up as many reaction equations as possible that can be used to obtain carboxylic acid from methane.

2CH4. = C2H2. + 3H2.
C2H2. + H2O. (mercury salts) = CH3CHO.
2CH3CHO. + O2. = 2CH3COOH.
methane – acetylene – acetaldehyde – acetic acid.



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