Which of the following statements is not true? Select only one answer. A) Crown ethers complex alkali metal ions by donation of partial negative charge from the oxygen atoms to the metal cation. B) Metal ion complexes of crown ethers dissolve in nonpolar aprotic organic solvents C) Addition of 18-crown-6 to a solution of benzyl bromide and potassium cyanide in a nonpolar solvent increases the rate of nucleophilic substitution. D) 18-Crown-6 is an acyclic molecule.

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