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  4. Lipids are insoluble in water because lipid molecules are :-

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Q. Lipids are insoluble in water because lipid molecules are :-

AIPMTAIPMT 2002Biomolecules

Solution:

Lipid molecules are insoluble or sparingly , soluble in water but are freely soluble in organic solvents like ether, alcohol and benzene. Insolubility of lipids in water is due to the fact that the polar groups they contain are much smaller than their nonpolar portions. The nonpolar chains are long complex hydrophobic hydrocarbon chains. If shaken in water lipids often form small droplets or micelles. The complex formed is called emulsions. These non polar proteins give them water repellent or hydrophobic property.