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Correlation of structure with the melting point.

The melting points of a series of 18-carbon fatty acids are: stearic acid (18:0), 69.6 C; oleic acid (18:1(Δ9)), 13.4 C; linoleic acid (18:2(Δ9,12)), -5 C; and linolenic acid (18:3(Δ9,12,15)), -11 C. What structural aspect of these 18-carbon fatty acids can be correlated with the melting point? give details.

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