is CH₃ or any alkyl group a +R or -R group? and if it is +R group then why p-CH3-C6H4-NH2 is less basic than p-OCH3-C6H4-NH2 as CH3 group shows +I and +R effect while OCH3shows -I and +R effect.and according to that the earlier one is more basic than the latter one.

'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