Which of the following is an aldehyde?

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Methane

Ethanol

Methanal

Propanoic acid

answer is C.

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Detailed Solution

Aldehyde is a class of organic compounds which contains -CHO as the functional group. The suffix which is used in the IUPAC naming of aldehyde compounds is "-al". So out of the given option, we can see that it is only option "c" that is Methanal, which contains "-al" suffix. So it is an aldehyde. Rest of the options have suffixes for other functional groups like- Ethanol has "-ol" which is an alcohol group.

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