Physical Properties

         (i) Physical state : Alkanes are colourless, odourless and tasteless.

         Alkanes              State

         C₁-C₄             Gaseous state

         C₅-C₁₇             Liquid state [Except neo pentane which is gas]

         C₁₈ and above       Solid like waxes

         (ii) Density : Alkanes are lighter than water.

         (iii) Solubility : Soluble in organic solvents and not soluble in water, solubility 1/ Molecular Mass

         (iv) Boiling points and Melting points : Melting points and boiling points.    Molecular volume 1/ No. of branches

•  Melting points of even > Odd no. of carbon atoms, this is due to, the alkanes with even number of carbon molecules have more symmetrical structure and result in closer packing in the crystal structure as compared to alkanes with odd number of carbon atoms.

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