Arrange followings in correct order of boiling point :-

(I) CH₃–I

(II) CH₃–CH₂–I
(III) CH₃–CH₂–Cl

(IV) CH₃–CH₂–CH₂–Cl

'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