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Chapter 19: Q32. (page 757)

Question: Rank the following compounds in order of increasing boiling point.

Short Answer

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Step by step solution

01

Step-by-Step SolutionStep 1: Boiling point

The boiling point of a compound is the temperature at which the vapor pressure of the compound equals the atmospheric pressure.

02

Factors affecting the boiling point

The boiling point of a compound depends on the intermolecular forces acting on it.

Compounds that involve hydrogen bonding (electrostatic force of attraction between hydrogen and a more electronegative atom) have a higher boiling point.

03

Order of boiling point of the given compounds

The given compounds are ketone, carboxylic acid, and alcohol.

Among the given compounds, both alcohol and carboxylic acid can participate in hydrogen bonding, and hence, have a higher boiling point than ketone.

Carboxylic acids have a higher boiling point than alcohols as they show more extensive intermolecular hydrogen bonding.

Boiling points of the given compounds

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Most popular questions from this chapter

For each amino acid [RCHNH2COOH], draw its neutral, positively charged, and negatively charged forms. Which form predominates at pH = 1, 6, and 11? What is the structure of each amino acid at its isoelectric point?

a. methionine (R=CH2CH2SCH3)

b. serine (R=CH2CH2OH)

Although codeine occurs in low concentration in the opium poppy, most of the codeine used in medicine is prepared from morphine (the principal component of opium) by the following reaction. Explain why selective methylation occurs at only OH in morphine to give codeine. Codeine is a less potent and less addictive analgesic than morphine.

morphine codeine

Question: Draw the structure corresponding to each name.

  1. 3,3-dimethylpentanoic acid
  2. 4-chloro-3-phenylheptanoic acid
  3. (R)-2-chloropropanoic acid
  4. m-hydroxybenzoic acid
  5. potassium acetate
  6. sodium 伪-bromobutyrate
  7. 2,2-dichloropentanedioic acid
  8. 4-isopropyl-2-methyloctanedioic acid

Question: What alcohol can be oxidized to each carboxylic acid?

a.

b.

c.

Calculate the isoelectric point for each amino acid.

a. cysteine: pKa (COOH) = 2.05; pKa(伪-NH3+)=10.25

b. methionine: pKa(COOH) = 2.28; pKa(伪-NH3+)=9.21
See all solutions

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