Under which conditions does \({\text{C}}{{\text{H}}_{\text{4}}}\) have the same number of molecules as \({\text{100 c}}{{\text{m}}^{\text{3}}}\) of \({{\text{O}}_{\text{2}}}\) at 27 °C and \(1.0 \times {10^5}{\text{ Pa}}\)?

D

Some teachers were worried about the use of a skeletal formula for the benzene ring. Certainly skeletal formulas are not on the syllabus but the benzene ring is.