Structural Formula of Carbon Compounds

  1. A molecular formula is a chemical formula which shows the actual number of atoms of each element present in one molecule of a substance
  2. A structural formula is a chemical formula which shows the arrangement of the atoms in a molecule of a substance.

Writing the Structural Formulae

Rules to be followed:

  1. All atoms are bonded together by covalent bond represented by a straight line. The bond can be a single bond, a double bond or a triple bond.
  2. The number of covalent bonds at each atom is as follow:
    1. Hydrogen: 1 
    2. Carbon: 4
    3. Oxygen: 2

Steps to be followed:

Step 1: Determine the number of carbon in the molecule (Let's say 3 carbon atom)
Step 2: Draw all the carbon atoms in a straight line and then draw the covalent bonds to connect all the carbon atoms.

Step 3: Draw additional single covalent bonds on each

Step 4: Write the hydrogen atoms

Step 5: Check that each carbon atom has four single covalent bonds, each hydrogen atom has one single covalent bond.





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