Question

how to know overall oxidation number of a molecule. for example how will i know that oxidation no of C2H5 is 1

Answer 1

HEY MATE,
ITS VERY EASY TO DO THAT...
JUST TAKE THE VALENCIES ADD THEM UP AND FIND THE RESULTS BY CROSS MULTIPLE METHOD OF CHEMIST RY

Answer 2

your answer is here
this is solution for your question

The oxidation number of a monatomic ion equals the charge of the ion. Theoxidation number of H is +1, but it is -1in when combined with less electronegative elements. Theoxidation number of O in compounds is usually -2, but it is -1 in peroxides. The oxidation number of a Group 1element in a compound is +1.

may answer will help you