From Amongst the following alcohols the one that would react fastest with conc.HCl and anhydrous ZnCl2, is

(1) 2- Butanol

(2) 2- Methylpropan-2-ol

(3) 2-Methylpropanaol

(4) 1-Butanol

'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