Electrophilic bromination of 3-phenylpropanenitrile occurs preferentially at the ortho and para positions. Assuming substitution at the ortho position, draw the structure of the most important resonance contributor of the carbocation intermediate.

Nonmetals usually react by gaining electrons

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Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.