A) \[C{{H}_{3}}-{{(C{{H}_{2}})}_{15}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{{{N}^{+}}-}}}\,}}}\,C{{H}_{3}}B{{r}^{-}}\]
B) \[C{{H}_{3}}-{{(C{{H}_{2}})}_{14}}-C{{H}_{2}}-N{{H}_{2}}\]
C) \[C{{H}_{3}}-{{(C{{H}_{2}})}_{16}}-C{{H}_{2}}OSO_{2}^{-}N{{a}^{+}}\]
D) \[OHC-{{(C{{H}_{2}})}_{14}}-C{{H}_{2}}-CO{{O}^{-}}N{{a}^{+}}\]
Correct Answer: B
Solution :
Surfactant are those which have charge on their tail e.g., cetyltrimethyl ammonium bromide. \[\overset{\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\overset{\,\,\,\,\,\,\,\,\,\,|}{\mathop{\underset{\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\underset{\,\,\,\,\,\,\,|}{\mathop{C{{H}_{3}}-{{(C{{H}_{2}})}_{15}}-{{N}^{+}}-C{{H}_{3}}-B{{r}^{-}}}}\,}}\,}}\,}}\,\] Surfactants are those, which dissociate in water to yield positively charged ion.
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