Which is not a binary compound?

h2o

nacl

naoh

ch4

Explanation: Binary compound is a substance composed of exactly two different elements.

is a binary compound as it is made up of hydrogen and oxygen atoms.

is a  binary compound as it is made up of sodium and chlorine atoms.

is a not a binary compound as it is made up of three different elements i.e sodium, oxygen and hydrogen.

is a binary compound as it  is made up of carbon and hydrogen atoms.