please describe the basicity order of the following compounds::

a)Ph-NH2

b)Ph-NH2 and at ortho position -CCl3

c)Ph-NH2 and at meta position -CCl3

d)Ph-NH2 and at para position -CCl3

'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