Why is 2,6dimethyl-4-nitro benzenol less acidic than 2methyl-4-nitro benzenol? Why sterric hinderance of 2 methyl groups not dominant than 1 methyl group?Is it due to hydrogen bonding or not?

'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