Hydrocarbons - Result Question 30

####13. The highest boiling point is expected for

$(1986,1 M)$

(a) iso-butane

(b) $n$-octane

(c) 2, 2, 3, 3-tetramethyl butane (d) $n$-butane

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Answer:

Correct Answer: 13. (a)

Solution:

  1. Boiling point of alkane increases with molar mass. Among isomeric alkanes, branching decreases boiling point. Therefore, $n$-octane has highest boiling point, higher than

2, 2, 3, 3-tetramethyl-butane (an isomer of $n$-octane).



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