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Arrange the following in decreasing order of their boiling points.
1. n-butane
2. 2-methylbutane
3. n-pentane
4. 2, 2-dimethylpropane
Options:
1. n-butane
2. 2-methylbutane
3. n-pentane
4. 2, 2-dimethylpropane
Solution:
1168 Upvotes
Verified Answer
The correct answer is:
$3>2>4>1$
$3>2>4>1$
We know that, as the number of carbon atom increases, boiling point increases while for the same alkane, boiling point decreases with branching.
$$
n-\text { pentane, b.pt }=309.1 \mathrm{~K}
$$
$$
n \text {-butane, b.pt }=273 \mathrm{~K}
$$
$$
n-\text { pentane, b.pt }=309.1 \mathrm{~K}
$$
$$
n \text {-butane, b.pt }=273 \mathrm{~K}
$$
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