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(A) The Critical Micelle Concentration $(CMC)$ of a surfactant decreases as the length of the hydrophobic hydrocarbon chain increases. This is because

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$CH_3(CH_2)_{15}N^{+}(CH_3)_3Br^{-}$

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(A) The Critical Micelle Concentration $(CMC)$ of a surfactant decreases as the length of the hydrophobic hydrocarbon chain increases. This is because a longer hydrophobic chain makes the surfactant molecule more hydrophobic,which decreases its solubility in water and increases its tendency to aggregate into micelles to minimize contact with water. Comparing the chain lengths: Option $A$: $16$ carbons Option $B$: $12$ carbons Option $C$: $7$ carbons Option $D$: $12$ carbons Since option $A$ has the longest hydrocarbon chain ($16$ carbons),it will have the lowest $CMC$ value.

List-$I$	List-$II$
$(A)$ Solid dispersed in liquid	$(I)$ Emulsion
$(B)$ Liquid dispersed in liquid	$(II)$ Foam
$(C)$ Gas dispersed in liquid	$(III)$ Gel
$(D)$ Liquid dispersed in solid	$(IV)$ Sol
	$(V)$ Aerosol

Among the following,the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions is

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