Lecture 10: Intermolecular Forces and Intro to Reactivity
KEY INFORMATION SUMMARY
PROBLEMS
Problem 10.1: Intermolecular Forces
- Describe the intermolecular forces, in decreasing significance. SOLUTION
- H2CO
- CH3CH2OH
- CH3CON(CH3)2
- CH3C≡CH
- Predict which compound, for each set, would have the strongest intermolecular forces. SOLUTION
- CH3CH2CH2CH3, (CH3)2CHCH3, (CH3)4C
- CH3CH2CH2OH, (CH3)2COHCH3, (CH3)3COH
Problem 10.2: Physical Properties
- Predict which compound, for each set, will have the highest boiling point. SOLUTION
- CH3CH2CH3, CH3CH2CH2OH, CH3OCH2CH3
- CH3CH2CH2CH2OH, (CH3) 2CHCH2OH, (CH3) 3COH
- CH3CH3, CH3CF3, CF3CF3
- HN(CH3) 2, H2N(CH3), H3N
- Why does salt (NaCl) dissolve in water? SOLUTION
- Why does salt (NaCl) NOT dissolve in hexane? SOLUTION
Problem 10.3: Acids-Bases
- Identify the conjugate acid and conjugate base in each of the following pairs of compounds. Draw the Lewis structures of each species and add necessary formal charges. SOLUTION
- [(CH3)2CHO]- and (CH3)2CHOH
- HNO3 and [NO3]-
- [NH2]- and NH3
- Identify each of the following as Lewis acid or Lewis base: [(CH3)3C]+, BH3, [CH3]-, and [HO]-. SOLUTION
- Rank the following from least acidic to most acidic. SOLUTION
Problem 10.4: Mechanisms
- Add the curved arrows to complete each transformation below. SOLUTION
- Find the error in each mechanism below. Propose a corrected mechanism. SOLUTION