Why there is an increase in order of m.p.& b.p. in NaF>NaCl>NaBr>NaI

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Why there is an increase in order of m.p.& b.p. in NaF>NaCl>NaBr>NaI

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I am stuck where i get (2a + (m-1)d)/(2a + (n-1)d) = m/n

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