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- 3.The boiling points of propanol (CH₃CH₂CH₂OH) and pentanol (CH₃CH₂CH₂CH₂CH₂OH) are 97°C and 137°C, respectively. The boiling point of butanol (CH₃CH₂CH₂CH₂OH) is predicted to be: A. < 97°CB. > 137°CC. > 97°C and < 137°CD. 97°CE. 137°C12. Normal boiling point of ethanol (C2H5OH) is 78 °C, and of propanol (C3H;OH) is 97 °C. a. Explain the reason for the difference in boiling points of these two alcohols. b. When the underline methyl group in propanol, CH3CH2CH2OH, is replaced with a hydroxyl group (HOCH2CH2OH), boiling point of the molecule increases to 197 °C. Explain the reason for observed increase in the boiling point.VI. Arrange the following compounds according to increasing solubility in water. Write only the letters. 1. A. CH3(CH2)2 OCH3 B. D. (CH3)2CHCH₂NH2 CH3(CH2)16C-OH C. CH3 CH₂2CH3
- 12. Normal boiling point of ethanol (C2H5OH) is 78 °C, and of propanol (C3H;OH) is 97 °c. a. Explain the reason for the difference in boiling points of these two alcohols. b. When the underline methyl group in propanol, CH3CH2CH2OH, is replaced with a hydroxyl group (HOCH CH2OH), boiling point of the molecule increases to 197 °C. Explain the reason for observed increase in the boiling point.Which is more soluble in octane, C8H18: propane CH3-CH2-CH3 OR 1-propanol, CH3-CH2-CH2-OH. Why? a. propane, only has dispersion forces. b. 1-propanol, because it can hydrogen bond. c. 1-propanol, because it has strong dispersion forces.Which compound has the highest boiling point? A. HO- В. C. HO D. OC O A B OD
- Which one is more soluble in octane, C8H18: Propane CH3-CH2-CH3 or 1-Propanol, CH3-CH2-CH2-OH. Why ? A. 1-propanol because it has strong dispersion forces. B. 1-propanol because it is polar C. 1-propanol because it can hydrogen bond D. Propane because it has only dispersion forces1. On average there are _______ hydrogen bonds per molecule in water at room temperature a. 1 b. 2 c. 3 d. 4 e. 5 2. On average, there are ______ hydrogen bonds per molecule in ice. a. 1 b. 2 c. 3 d. 4 e. 5 3. Which of the following alcohols would be most soluble in water? a. methanol (CH3OH) b. ethanol (CH3CH2OH) c. butanol (CH3CH2CH2CH2OH) d. octanol (CH3[CH2]6CH2OH) e. phenol (benzyl-OH) 4. Hydrophobic interactions a. are stronger than covalent bonds b. are responsible for the surface tension of water c. can hold two ions together d. are the major force forming lipid (hydrocarbon) bilayersWhich of the following will have the lowest boiling point? I. CH3(CH2)3 CH3 II. CH3CH2CH3 III. CH3CH2CH2OH IV. CH3CHOHCH3 Select one: a. II. b. III. c. I. d. IV.
- Which one of the following can form hydrogen bonds? a. H2S b. HCl c. N(CH3)3 d. HN(CH3)2 e. CH3-O-CH3What is the strongest intermolecular force present in 2-methylbutane, (CH3)2CHCH2CH3 ? a. Dipole-dipole forces b. Hydrogen bonding c. London forces d. Ionic bondingIndicate the strongest intermolecular attraction between each pair of molecules. NH3 and H20 NH3 and NH3 NH4*1 and NH3 CH4 and NH3 CH4 and CH4 a. London's b. dipolar c. hydrogen bond d. ion to dipole