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Physical Properties of Alkanes

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Physical properties of alkane - definition

  • All alkanes are colourless and odourless.
  • Alkanes experience intermolecular vander waal force of attraction.
  • Stronger intermolecular van der Waals forces give rise to greater boiling points of alkanes.
  • The melting point of the alkanes follow a similar trend to boiling point for the same reason as outlined above. That is, (all other things being equal) the larger the molecule the higher the melting point. 

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Saturated Hydrocarbons - Alkanes

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Preparation of Alkanes

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Conformations of Alkanes

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Combustion Reactions of Alkanes

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Alkanes-Isomerisation, Aromatization, Pyrolysis and Reaction with steam

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Physical properties of Alkanes
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When cyclohexane is poured on water, it floats because :

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There is no ring strain in cyclohexane, but cyclobutane has an angle strin of If of cyclohexane per group is 660 kJ and of cyclobutane is 2744 kJ , what is the ring strain in kJ of cyclobutane ? 

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Melting point of n-butane is higher than propane.

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The decreasing order of the acidic character of the following is:

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Which of the following groups do not show addition reactions?

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Even though the rings are different size, cyclopropane and cyclobutane have similar overall strain energy. This is because:

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Select from pairs of compounds,one with higher boiling point
and hexane

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What effect does branching of an alkane have on its melting point?

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During debromination of meso-dibromobutane, the major compound formed is:

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Rank the transition states that occur during the following reaction steps in order of increasing stability $$(least \xrightarrow \,most stable)$$
1.$$H_3C \, - \, \overset{+}{OH_2} \, \xrightarrow \, CH_3^{+} \, + \, H_2O$$
2.$$(CH_3)_3C \, - \, \overset{+}{OH_2} \xrightarrow \, -  \,(CH_3)_3C \, + \, H_2O$$
3.$$(CH_3)_2 \, CH \, - \, \overset{+}{OH_2} \xrightarrow \,(CH_3)_2CH^+ \, + \, H_2O$$

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