Given the following heats of combustion per CH₂ group within the structure, which cyclic alkane has essentially no angle strain? (Ref: long-chain Alkane = 659 kJ/mol)

A) cyclobutane = 686 kJ/mol
B) cyclopentane = 664 kJ/mol
C) cyclohexane = 659 kJ/mol
D) cycloheptane = 662 kJ/mol
E) cyclooctane = 663 kJ/mol

Angle Strain

A form of strain in a cyclic molecule when bond angles deviate from their ideal values, leading to extra energy stored in the compound.

Heats of Combustion

The amount of heat released when a compound undergoes complete combustion with oxygen under standard conditions.

Cyclic Alkane

A saturated hydrocarbon in which the carbon atoms are arranged in a ring, with the formula CnH2n.