What is the molecular formula and structural formula of a cyclic hydrocarbon whose one molecule contains 8 hydrogen atoms?

65 Which of the following compounds can have a triple bond?

C₂H₄, C₃H₄, C₃H₆,

66 Write the molecular and structural formula of a cyclic hydrocarbon whose molecule contains 8 atoms of carbon. 68 Write the molecular formula of: (i) an alkane (ii) an alkene, and (iii) an alkyne, each having 20 carbon atoms? 69 Which of the following compounds can have a double bond?

C₄H₁₀; C₅H₈; C₅H₁₀;