2-Chloro-3,3-dimethylbutane or 3-Chloro-2,2-dimethylbutane...

My teacher first one is correct but why is the second one not correct in terms of locant rule ?? Pls help

'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