Which of the following compound should have lowest boiling point:
Correct answer: A. C2H6
- A. C2H6
- B. C2H5Cl
- C. CH3 − O − CH3
- D. C2H5OH
Explanation
Melting and boiling points of alcohols are higher than corresponding alkanes. Methyl alcohol and ethyl alcohol are liquids while methane and ethane are gases. This is also due to hydrogen bonding which is present in alcohols but absent in alkanes. ethers are less polar than alkyl halides hence lower boiling point than alkyl halides but more than corresponding alkanes.The boiling point of organic molecules increases in the order: Alkanes > Alkenes > Alkynes > Haloalkanes > Ether > Ester > Amine > Aldehyde > Ketone > Alcohol > Carboxylic Acid > Amide.
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About Alcohols and Phenols
Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
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