The arrangement of the fatty acid from the highest melting point to the lowest melting point is ordered as follows;
- CH₃(CH₂)₁₆COOH Stearic acid >
- CH₃(CH₂)₁₂COOH Myristic acid >
- CH₃(CH₂)₇CH=CH(CH₂)₇COOH Oleic acid >
- CH₃(CH₂)₄(CH=CHCH₂)₄(CH₂)₂COOH Arachidonic acid
This question contains a missing image of the list of fatty acids to be ordered and the missing image can be seen in the image attached below.
The melting point of fatty acid largely depends on:
- the chain length and;
- the bonds linking the chains of the fatty acid.
The larger the size of the chain, the more the melting point increases which varies proportionally to the size of the chain.
Also saturated fatty acid(single straight-chain fatty acid) has a higher melting point than an unsaturated fatty acid (fatty acid-containing double bond).
Therefore, the order of the melting point of fatty acid from highest to lowest is:
- CH₃(CH₂)₁₆COOH Stearic acid >
- CH₃(CH₂)₁₂COOH Myristic acid >
- CH₃(CH₂)₇CH=CH(CH₂)₇COOH Oleic acid >
- CH₃(CH₂)₄(CH=CHCH₂)₄(CH₂)₂COOH Arachidonic acid
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