Which of the following columns will provide:

(a) highest number of plates?

(b) greatest retention?

(c) highest relative retention?

(d) best separation?

$$\begin{gathered} \mathbf{Column}\mathbf{}\mathbf{1}\mathbf{}\mathbf{:}\mathbf{}\mathbf{N}\mathbf{=}\mathbf{1000}\mathbf{;}{\mathbf{k}}_{\mathbf{2}}\mathbf{=}\mathbf{3}\mathbf{.}\mathbf{9}\mathbf{;}\mathbf{\alpha }\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{16}\mathbf{;}\mathbf{}\mathbf{resolution}\mathbf{=}\mathbf{0}\mathbf{.}\mathbf{6} \\ \mathbf{Column}\mathbf{}\mathbf{2}\mathbf{}\mathbf{:}\mathbf{}\mathbf{N}\mathbf{=}\mathbf{5000}\mathbf{;}{\mathbf{k}}_{\mathbf{2}}\mathbf{=}\mathbf{3}\mathbf{.}\mathbf{9}\mathbf{;}\mathbf{\alpha }\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{06}\mathbf{;}\mathbf{}\mathbf{resolution}\mathbf{=}\mathbf{0}\mathbf{.}\mathbf{8} \\ \mathbf{Column}\mathbf{}\mathbf{3}\mathbf{}\mathbf{:}\mathbf{}\mathbf{N}\mathbf{=}\mathbf{500}\mathbf{;}\mathbf{}\mathbf{}{\mathbf{k}}_{\mathbf{2}}\mathbf{=}\mathbf{4}\mathbf{.}\mathbf{7}\mathbf{;}\mathbf{\alpha }\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{31}\mathbf{;}\mathbf{}\mathbf{resolution}\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{1} \\ \mathbf{Column}\mathbf{}\mathbf{4}\mathbf{}\mathbf{:}\mathbf{}\mathbf{N}\mathbf{=}\mathbf{2000}\mathbf{;}{\mathbf{k}}_{\mathbf{2}}\mathbf{=}\mathbf{2}\mathbf{.}\mathbf{4}\mathbf{;}\mathbf{\alpha }\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{24}\mathbf{;}\mathbf{}\mathbf{resolution}\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{5} \end{gathered}$$

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