For doing organic conversions, you must have strong hold over the reactions of various functional groups. As soon as you read any question of organic conversion, just write the given compound on the left hand side and the required compound on the right hand side. Carefully note the functional groups and the number of carbon atoms in both these compounds.
Then, proceed with the reactions you have learnt for the functional group present in the given compound as to arrive at the desired compound.
You can also refer to conversion tables and charts.
It is a bit difficult in starting, but practice will make you perfect.
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