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As far as I can gather from mark schemes of A level papers... Hydrogenation is simply ADDING HYDROGEN, whereas reduction is removing O2 for example and replacing it with H2

Example: In this test paper, the marks are given for Hydrogenation ONLY, not reduction:

H2C=CH2 + H2 --> CH3CH3

In this test paper, the marks are given for reduction ONLY, and not hydrogenation:

C6H5NO2 + 3H2 --> C6H5NH2 + 2H2O

(NitroBenzene) (AminoBenzene/phenylamine)

This is just interpretation of the mark scheme, not concrete proof.

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