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how do the melting and boiling points o the hydrocarbons change with increase in molecular mass?

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There increase because of the increase in the molecular size. As a result, the intermolecular forces of attraction increase.
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DINESH PUBLICATION-CARBON AND ITS COMPOUNDS-Very Short Answer Question
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  10. An alehye as well as a ketone can be represented by the same molecular...

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  11. Write the molecular formulae of: CH(3)Br and C(2)H(5)Br.

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  12. Why are organic compounds present in such a large number?

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  13. The fundamental group 'al'is present in the family of an organic compo...

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  16. Write the formula and name of next homologue of CH(3)COCH(3).

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  18. Draw electron dot structures of (i) C(2)H(4) (ii) C(2)H(5)OH.

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