there was a question in jee advance 2013 paper 1 no. of lone pairs in melamine are..... for that you need to know he structure of melamine as there are chances that these types of questions can be asked again can i get to know which compound structures are important in organic and inorganic???

'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