Ques. 1AIPMT 2002
Lipids are insoluble in water because lipid molecules are
- hydrophilic
- hydrophobic
- neutral
- zwitterions.
Answer
(2) hydrophobic
Solution
Lipids (fatty acids, glycerides, oils, waxes) consist mainly of long non-polar hydrocarbon chains.
⇒ Non-polar molecules cannot form hydrogen bonds with polar water molecules, i.e. they are hydrophobic (water-repelling).
∴ Lipids are generally water insoluble because lipid molecules are hydrophobic.
Answer: (2)