CBSE Class 10 Science 2017 · Paper 531/3 · Question 2
Write the structural formula of propane and determine the number of covalent bonds in its molecule.
Answer
Propane is ; it has 2 C-C and 8 C-H bonds, 10 covalent bonds in all.
Structural formula of propane (): , that is, three carbon atoms joined by single bonds, with three hydrogen atoms on each end carbon and two on the middle carbon (drawn in full in the figure).
Number of covalent bonds: 2 C–C bonds + 8 C–H bonds = 10 covalent bonds.
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