Question

Alkanes with odd number of carbon atoms have low melting point than those with an even number

Answer 1

We know that alkane molecules with odd numbers of carbon atoms have lower intermolecular forces of attraction and correspondingly lower boiling points because they pack less tightly.
This is because methyl groups at the ends of chains can avoid methyl groups of another chain only by increasing distance between their chains.
Therefore, alkanes with odd number of carbon atoms have lower melting point than those with an even number of carbon atoms.

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