A) -121 kJ/mol
B) -222 kJ/mol
C) +432 kJ/mol
D) +123 kJ/mol
Correct Answer: A
Solution :
\[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\to {{H}_{2}}O.\] \[\Delta H=-241\,kJ\] \[{{C}_{6}}{{H}_{10}}+\frac{17}{2}{{O}_{2}}\to 6C{{O}_{2}}+5{{H}_{2}}O,\] \[\Delta H=-3800\,kJ\] (2) \[{{C}_{6}}{{H}_{12}}+9{{O}_{2}}\to 6C{{O}_{2}}+6{{H}_{2}}O\] \[\Delta H=-3920\,kJ\] (3) Hydrogenation of cyclohexene \[{{C}_{6}}{{H}_{10}}+{{H}_{2}}\to {{C}_{6}}{{H}_{12}}\] eq.(1)+eq. (2)-eq.(3) \[\Delta H=-241-3800-(-3920)\] \[=-4041+3920\] \[=-121\,kJ\] Hence, the correct option is [a].
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