1.

Arrange the following in decreasing order of their boiling points. (a) n-butane (b) n-pentane (c) 2-methylbutane (d) 2, 2-dimethylpropane

Answer»

`a gt b gt C gt d`
`b gt c gt d gt a`
`d gt c gt b gt a`
`c gt b gt d gt a`

Solution :Boiling POINT decreases with increase in branching and with decrease in total number of carbon ATOMS. Thus, the correct order is
C (n - pentane) `gt` B (2-methylbutane) `gt` D (2, 2-dimethylpropane) `gt` A (n-butane).


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