Chemistry, asked by ankitsagar, 1 year ago

Give a short note on melting point of an alkane.

Answers

Answered by Anonymous
17
Answer :

Melting point of an alkane -

The melting point of an alkane containing even number of Carbon atom is greater than that of alkane having odd number of Carbon atom. This effect is known as alternation effect.

This is because in an alkane the Carbon atom are {sp}^{3} hybridised and bond angle will be 109.28° . So, it's structure will be zig zag.

Due to this in an alkane containing even number of Carbon atom, the two methyl group are on opposite side and form well packed structure and needs higher amount of energy to break crystal lattice.

Whereas in an alkane containing odd number of Carbon atom, the two methyl group and doesn't have well packed structure.
Answered by Anonymous
3

Explanation:

The melting points of alkanes also increase with the increase in their molecular mass, but there is no regular variation in melting point.

The melting points of alkanes depend not only upon the size and shape of the molecules, but also on the arrangement (i.e. the packing) of the molecules in the crystal lattice.

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