Choose the correct statement about cycloakanes:
Correct answer: C. Their melting and boiling points show a gradual increase with increases molecular weight.
- A. Cyclopropane and cyclobutane are liquids at room temperature.
- B. Cycloalkanes are insoluble in ethanol and ether but soluble in water.
- C. Their melting and boiling points show a gradual increase with increases molecular weight.
- D. Both (B) & (C) are correct
Explanation
The longer the alkane gets (higher molecular weight), the more intermolecular forces are present (London Dispersion), and this increases the melting and boiling points therefore as cycloaljanes increase the chain the intermolecular forces increase more energy is required to break their bonds.
This question appeared on the ETEA MDCAT 2017 paper, which you can sit online with every answer explained.
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About Alkanes
Alkanes are saturated hydrocarbons containing only carbon-carbon and carbon-hydrogen single bonds, with the general formula CnH2n+2 for open chains. Their structure, isomerism, IUPAC nomenclature, physical properties, combustion, free-radical halogenation and conformations are covered, including the difference between substitution in alkanes and addition in unsaturated hydrocarbons.
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