Question

which one out following is not compound ? a) CO,b) Fe, c)H2O ,d) NaCl​

Answer 1

Fe..

Fe is not a compound

.

Answer 2

$\huge\underline\mathbb{Answer}$

The correct option is b

i.e is Fe

Reason : Because the other options are compounds which is made up of two or more elements while Fe is the only element in the given options.