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Freidel Craft Alkylation Acylation

Which of the ...

Question

Which of the reaction defines /_\H^°_f
A) Diamond + oxygen molecule -> carbon monoxide
B) 0.5H₂ + 0.5 F₂ -> HF
C)N₂ +3H₂--> 2NH₃
D)2CO +O₂ -->CO₂

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Solution

Answer-Option B
∆Hf° denote the standard heat of formation of compound
Only one mole of compound should form in the defination of ∆Hf°
so option A,C and D is wrong because in those reaction more than one mole of product is forming
so option B is correct

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