Correct option is D
Explanation-
Option A - HCOOH (Formic acid)
Structure: H–C(=O)–OH
Assign oxidation state (O.S) to C:
H: +1
O: –2
Equation: +1 (H) + x (C) –2 (O) –1 (OH) = 0
x = +2
Oxidation state of carbon = +2
Option B - HCHO (Formaldehyde)
Structure: H–C(=O)–H
H: +1 (×2)
O: –2
Equation: +1 + x +1 –2 = 0
x = 0
Oxidation state of carbon = 0
Option C - CH₃OH (Methanol)
Structure: CH₃–OH
H (×4): +1
O: –2
Equation: 4(+1) + x –2 = 0
x = –2
Oxidation state of carbon = –2
Option D - CO₂ (Carbon dioxide)
Structure: O=C=O
Each O: –2
Equation: x + (–2×2) = 0
x = +4
Oxidation state of carbon = +4
Since CO₂ has the most oxidized carbon so, option D is correct answer
