Alkyl halides or halo alkanes are mono substituted halogen derivatives of alkanes or is it that alkyl halides are Js halogen derivative s of alkanes?? Wt do v call halogen derivatives of alkanes n ynes

'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