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The enthalpy of combustion of hydrogen (H₂), cyclohexene, and cyclohexane are -241 kJ/mol, -3800 kJ/mol, and -3920 kJ/mol, respectively. The heat of hydrogenation of cyclohexene is:

A) -3700 kJ/mol
B) -3540 kJ/mol
C) -3400 kJ/mol
D) -3200 kJ/mol

Answer :

Final answer:

The correct option is option C). The heat of hydrogenation of cyclohexene can be calculated by comparing enthalpy of combustion values of cyclohexane and cyclohexene.

Explanation:

The correct option is option C). The heat of hydrogenation of cyclohexene can be calculated using the enthalpy of combustion values provided. First, we calculate the expected heat of hydrogenation based on the isolated double bond model for cyclohexene (130 kJ/mol) and cyclohexane (-3920 kJ/mol). Then, by subtracting the enthalpy of combustion of cyclohexene (-3800 kJ/mol) from that of cyclohexane, we find the actual heat of hydrogenation to be -290 kJ/mol. Therefore, the correct option is not provided in the question.

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