Question

Give the oxidation state of each carbon in ch3cooh

Answer 1

here is a simple way to answer such type in multiple choice questions
draw a table from 1 to 20 elements make a second column down of the elements
now, keep zero under nobel gases
as you see in the number line zero will be in the middle and on the left-ve and at right+be same as that place 1,2,3,4 to the right of 0 and-1,-2,-3

hence its clear
if you know alkaline or alkali metals u can easily detect them