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Question

The oxidation numbers​ of C(bonded to 2H atoms) and C(bonded to 1H atom) in propene CH3-CH=CH2 are respectively
OPTIONS
A. -1, -2. B. -1, -1
C. -2, -1. D. +2, -1

[Dear mentor please give the detailed solution along with explaination.]

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Solution

option A
  1. In a C-H bond, the H is treated as if it has an oxidation state of +1. This means that every C-H bond will decrease the oxidation state of carbon by 1.
  2. Any two bonds between the same atom do not affect the oxidation state (recall that the oxidation state of Cl in Cl-Cl (and that of H in H-H) is zero. So a carbon attached to 4 carbons has an oxidation state of zero.

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