in a question i came upon the fact that cyclohexyl carbocation (cyclohexane with a positive charge on any one of the six) is more stable than cyclopentadienyl carbocation ( double bonds on 1,2 and 4,5 and carbocation on 3) why is this so?

'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