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$$ \begin{array}{cc} \text{1-hexyne}&\pu{-132 ^\circ C}\\ \text{2-hexyne}&\pu{-89.5 ^\circ C}\\ \text{3-hexyne}&\pu{-103 ^\circ C}\\ \end{array} $$

These are the melting points of six carbon chain alkynes. The boiling point of a molecule is mainly affected by its shape. So, if all this molecules have the same shape, why is the range of temperatures so high ($\pu{42.5 ^\circ C}$)?

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    $\begingroup$ Those molecules do NOT have the same shape, they look quite differently. $\endgroup$ – Karl Mar 4 '18 at 15:47

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