1.

Arrange the given compounds in decreasing order of boiling points. underset("I")(CH_(3)CH_(2)CH_(2)CH_(2)Br underset("II")(CH_(3)-underset(" "CH_(3))underset(|)overset(" "CH_(3))overset(|)C-Br) underset("III")(CH_(3)-CH_(2)-underset(CH_(3))underset("|")(CH)-Br)

Answer»

I `GT` III `gt` II<BR>II `gt` I `gt` III
I `gt` II `gt` III
III `gt` I `gt` II

Solution :MAGNITUDE of van der Waals. forces goes ondecreasing with branching. Hence, the order of boiling points is
`CH_(3)CH_(2)CH_(2)CH_(2)Br gt CH_(3)CH_(2)-underset(CH_(3))underset("|")(CH)-Br gt underset(""CH_(3))underset("|")OVERSET(""CH_(3))overset("|")(CH_(3)-C-Br)`


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