how to find stability of carbocations in benzene ring..???

and

how how to find optically inactive isomers ??? (say of--C2H5Cl)

how to find the weakest C-X (carbon-halogen bond in a benzene ring????

'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