Which two compounds are isomers of each other?
(1) ch3ch2cooh and ch3cooch2ch3
(2) ch3ch2cho and ch3coch3
(3) ch3chbrch3 and ch2brchbrch3
(4) ch3chohch3 and ch3chohch2oh

your parents i think this could be it

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.