In which of the following pairs of compounds are the two members of the pair constitutional isomers?

In which of the following pairs of compounds are the two members of th

1.	In which of the following pairs of compounds are the two members of the pair constitutional isomers?
Answer» methoxymethane and ethoxyethane pentanol and pentanediol propyl alcohol and di-n-propyl ether isobuty alcohol and diethyl ether Solution :`CH_(3)-underset(CH_(3))underset(\|)CH-CH_(2)-OH` `CH_(3)-CH_(2)-O-CH_(2)-CH_(3)` Same MOLECULAR FORMULA but different in structure.