dipole moment of 2,4,6,trimethylnitrobenzene (3.65 D) is closer to that of nitromethane (3.50 D) than to that of nitrobenzene (3.95 D).Explain...?

'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