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# The highest boiling point is expected for

$\begin{array}{1 1}(a)\;\text{iso-octane}&(b)\;\text{n-octane}\\(c)\;\text{2,2,3,3-tetramethyl butane}&(d)\;\text{n-butane}\end{array}$

In n-octane we find the longest carbon chain of eight carbon atoms so its boiling point will be highest.
Hence (b) is the correct answer.