Which of the following isomer of pentane have least melting and boiling points?
Correct answer: C. neo-pentane
- A. n-pentane
- B. iso-pentane
- C. neo-pentane
- D. 2-methyl butane
Explanation
Neo-pentane (also known as 2,2-dimethylpropane) has the least melting and boiling points. Neo-pentane has a highly branched structure with three methyl groups attached to a central carbon atom. This branching reduces the surface area available for intermolecular interactions, leading to weaker intermolecular forces such as London dispersion forces. Weaker intermolecular forces result in lower melting and boiling points.
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About Chemistry of Hydrocarbons
Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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