Question

5) a) C3H6, C4Hg and C5H10
belong to the same
homologous series.
i) Define homologous series.
ii) Why is the melting point of
C4H8 lower than C5H10?
b) Why covalent compounds
have low melting point ?​

Answer 1

Explanation:

A) C3H6, C4Hg and C5H10 belong to the same homologous series ??

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They show similar chemical properties, and gradation in physical properties such as melting point, boiling point, density, solubility, etc. Here, C3H6, C4H8 and C5H10 differ by −CH2− group, hence they belong to same homologous series.

i) Define homologous series.⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀$\huge{\underline{\blue{\mathfrak{♡</strong></h3><p><strong>Answer♡}}}}$⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

⠀⠀⠀⠀⠀⠀A homologous series is a series of compounds with the same general formula, usually varying by a single parametersuch as the length of a carbon chain. Compounds within a homologous series typically have a fixed set of functional groups that gives them similar chemical and physical properties.⠀⠀⠀

ii) Why is the melting point of C4H8 lower than C5H..??

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⠀⠀⠀⠀⠀⠀Melting and boiling points of C5H10 Higher than that of C4H8 because C5H10 has more molecular mass than C4H8, so if molecular mass is more, more will be the vander wall force due to which force of attraction between molecules in C5H10 is more than C4H8.

⠀⠀⠀⠀⠀⠀⠀⠀

⠀⠀⠀b) Why covalent compounds have low melting point ?

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⠀⠀⠀⠀⠀⠀Since the forces are weak, it needs only a little amount of energy to break. Heat is a form of energy. Since lower heat (energy) is capable of breaking these weak intermolecular forces, therefore the melting and boiling points of covalent compounds is low.

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