Question

There is no ring strain in cyclohexane, but cyclobutane has an angle strain of 9º 44’. If ∆H_C^º of cyclohexane per (CH₂) group is 660kJ mol/L and ∆H_C^º of cyclobutane is 2744 kJ mol/L, what is the ring strain in kJ mol/L of cyclobutane? 

(A) –104 (B) 104 (C) –2084 (D) 2084

Answer 1

Correct option  (B) 104

Explanation:

Ring strain = (∆H_c^° of cyclobutane − 4 x ∆H_C^°  of per (CH₂) group of cyclohexane). 

 = 2744 -(4 x 660) = 104 kJ mol^-1