How many structural isomers can be drawn for pentane (C5H12)?

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How many structural isomers can be drawn for pentane (C5H12)?

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Answer 1 · 2018-03-02T19:18:36

Are there not THREE structural isomers with formula $C_{5} H_{12}$ $C_5H_12$ ?

Explanation:

$(i)$ $(i)$ $H_{3} {CCH}_{2} {CH}_{2} {CH}_{2} {CH}_{3}$ $"H"_3"CCH"_2"CH"_2"CH"_2"CH"_3$ $n-pentane$ $"n-pentane"$ .

$(i i)$ $(ii)$ $H_{3} CCH ({CH}_{3}) {CH}_{2} {CH}_{3}$ $"H"_3"CCH"("CH"_3)"CH"_2"CH"_3$ $isopentane$ $"isopentane"$ .

$(i i i)$ $(iii)$ $H_{3} CC {({CH}_{3})}_{3}$ $"H"_3"CC"("CH"_3)_3$ $neopentane$ $"neopentane"$ .

The normal boiling points of these isomers are respectively: $36.1$ $36.1$ $^{\circ} C$ $""^@C$ ; $27.7$ $27.7$ $^{\circ} C$ $""^@C$ ; $9.5$ $9.5$ $^{\circ} C$ $""^@C$ .

Why does the length of the carbon chain apparently affect the boiling point?

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How many structural isomers can be drawn for pentane (C5H12)?

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