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.