Number of 1°, 2° and 3° hydrogen in isooctane is:

(1) 9,8,1

(2) 12,5,1

(3) 15,2,1

(4) None of these

'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