Question

Wch type of isomerism is present in the given compounds: HCOOCH3 and CH3COOH

Answer 1

In the given compounds functional isomerism is present i.e 1st is ester grp and in 2nd compound there is acid grp.
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Answer 2

Answer: Functional isomerism

Explanation:

The compounds having similar molecular formula but different arrangement of atoms or groups in space are called isomers and the phenomenon is called as isomerism.  

Functional group is a group of atoms which provide characteristic properties to a compound.

$HCOOCH_3$ and $CH_3COOH$ are functional isomers with $HCOOCH_3$  containing ester functional group and $CH_3COOH$ containing carboxylic acid functional group.

Thus they have same molecular formula but different functional groups attached.