What are the different types of bonds present in the structure?
Does Nitrogen donates one electron from its lone pair to carbon and acquires a positive charge?
How do I determine the Oxidation state of Nitrogen and Carbon?
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In such type of questions, we can't directly determine Oxidation state by the normal algebra method.
First you have to draw the structure.
1.In a covalent bond, the more electronegative element gets a contribution of -1and the other element gets a contribution of +1 charge(valid for both sigma and pi bonds. Treats double double bond as two single bonds and triple bonds as three singles bonds).
Bonds between same element have contribution 0 to each element.
In a coordinate bond, if the bond is directed from less electronegative element to more electrononegative element, the more elecronegative element gets a contribution of -2 and the less electrononegative element gets a contribution of +2.
4.in case the coordinate bond is directed from more electrononegative to less elecronegative elements, the contribution is 0 to each element.
5.To these 4 steps for each and every bond. The value of Oxidation state of an element is sum of all contributions due to all other elements/bonds.
In your question, due to C-H bond, carbon gets -1 and hydrogen +1. Due to the triple bond between C and N, N gets -3 and C gets +3.
Oxidation state of hydrogen is +1
Oxidation state of carbon is -1+3=+2
And oxidation state of nitrogen is -3