There are 6 noble gases namely krypton,xenon,helium,argon,neon and radon.Although these are unrractive towards any chemical but compounds of krypton,xenon and radon are known.How is that possible.Explain me the phenomenon of formation of these compounds.

'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