I have a doubt that is it important to know conversions such as ethane to ethene for engienering competitions view such as for iit,AIEEE,bits,etc? so do we need to learn all these conversion or we need to understand it.Please show me how to convert Propene to 2,3-Dimethylbutane.

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane