Answer true or false. (a) Fatty acids are long-chain carboxylic acids, with most consis...

Answer true or false.

(a) Fatty acids are long-chain carboxylic acids, with most consisting of between 12 to 20 carbons in an unbranched chain.

(b) An unsaturated fatty acid contains one or more carbon– carbon double bonds in its hydrocarbon chain.

(c) In most unsaturated fatty acids found in animal fats, vegetable oils, and biological membranes, the cis isomer predominates.

(d) In general, unsaturated fatty acids have lower melting points than saturated fatty acids with the same number of carbon atoms.

(e) Natural soaps are sodium or potassium salts of fatty acids.

(f) Soaps remove grease, oil, and fat stains by incorporating these substances into the nonpolar interior of soap micelles.

(g) “Hard water,” by definition, is water that contains ions, all of which react with soap molecules to form water-insoluble salts.

(h) The structure of synthetic detergents is patterned after that of natural soaps.

(i) The most widely used synthetic detergents are the linear alkylbenzenesulfonates (LAS).

(j) Present-day synthetic detergents do not form water-insoluble salts with hard water.

(k) Most detergent preparations contain foam stabilizers, a bleach, and optical brighteners (optical bleaches).