Which compound has the highest boiling point?
Correct answer: D. C2H5OH
- A. C2H6
- B. C2H2Cl
- C. CH3OCH3
- D. C2H5OH
Explanation
Among the given compounds, C2H5OH (ethanol) has the highest boiling point. The boiling points of the compounds increase as the intermolecular forces between their molecules increase. C2H5OH (ethanol) has a polar covalent bond between the carbon and oxygen atoms, which gives rise to strong hydrogen bonding interactions between its molecules. Hydrogen bonding is a particularly strong type of dipole-dipole interaction that arises when a hydrogen atom bonded to an electronegative atom, in this case oxygen, interacts with the lone pair of electrons on another electronegative atom in a different molecule, also in this case oxygen. As a result, ethanol has a much higher boiling point than the other compounds, at 78.5 °C.
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About Alcohols
Alcohols contain a hydroxyl group attached to a saturated carbon atom and are classified as primary, secondary or tertiary. Their nomenclature, hydrogen bonding, acidity, oxidation, dehydration, reaction with sodium and conversion to haloalkanes are covered, along with the distinction between alcohols and phenols, where the hydroxyl group is attached directly to an aromatic ring.
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