Methoxy methane $(CH_3-O-CH_3)$ and ethanol $(CH_3-CH_2-OH)$ are:

Which one of the following pairs of compounds are functional isomers?

What is metamerism? Give an example.

Given below are two statements :
Statement $(I) :$ $CH_3CH=CHCH_3$ and $cyclobutane$ are isomeric compounds.
Statement $(II) :$ $CH_3CH_2CH_2CH_2NH_2$ and $(CH_3CH_2)_2NH$ are functional group isomers.
In the light of the above statements,choose the correct answer from the options given below :

Compare the stabilities of the following two compounds :
$A$ : cis-$1$-Ethyl-$3$-methylcyclohexane
$B$ : trans-$1$-Ethyl-$3$-methylcyclohexane

Which of the following pairs of compounds are functional group isomers ?