Olive oil is a mono-unsaturated fat. Which of the following is the chemical formula for olive oil?
A) C14H29COOH
B) C15H31COOH
C) C16H33COOH
D) C17H33COOH
Answer: D
- mono-unsaturated = contains one C=C
- for every C=C added to a saturated hydrocarbon, the number of H atoms is reduced by 2 i.e. ethane (C2H6)/ ethene (C2H4), propane (C3H8)/ propene (C3H6)
- General formula for carboxylic acids: CnH2n+1COOH (n = 0,1,2...)
- For option D, n = 17 so H should be 35 (2x17+1). The formula shows 2 less H i.e. mono-unsaturated.
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