There are three types of hydrocarbon -alkane(CnH2n+2),alkyne(CnH2n-2),alkene(CnH2n).But which category does C6H4(benzyne) and C6H6(benzene) come under?

'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