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Q. What is structural formula and how to write it?
Ans.
To represent an organic molecule, a structural formula is often used. As a structural formula shows how the atoms in a molecule are bonded to each other, it gives more information than does a molecular formula. Therefore, to represent compounds clearly, structural formulas should be used.
For example, it is ambiguous to represent butane by its molecular formula C4H10 because another compound, 2-methylpropane, has the same molecular formula. Here are two different structural formulas for these two compounds that both have the molecular formula C4H10:
Note: The 2 in 2-methylpropane designates that the carbon in the methyl group branch is attached to the second carbon in the propane chain.
For convenience, the structural formulae of butane and 2-methylpropane are often written in shortened form as:
These are condensed structural formulas. In a condensed structural formula single bonds are usually omitted (except those joining additional branches to the main carbon skeleton). Double and triple bonds, however, are diagrammed.
Preparation of ethane by lab method
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