Question

There is no ring strain in cyclohexane, but cyclobutane has an angle strain of 9 44’. If ∆HC of cyclohexane per (CH2) group is 660kJ mol/L and ∆HC 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 = (∆Hc° of cyclobutane − 4 x ∆HC° of per (CH2) group of cyclohexane).

= 2744 -(4 x 660) = 104 kJ mol-1