(This is a question from MS Chouhan.I got the solution but still I have a doubt.Is only electrons present inside ring considered as pi electrons ?Is there any relation between aeromatic compound and pi electrons? If lone pairs are present inside ring then how to determine which is pi electrons. Please sir,reply soon as possible)

How many pi electrons are present in the following compound?

Ans-10

'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