Reactivity and Reactions Practice Problems

Review the following concepts if needed:

• Reactivity and Reactions for Organic Chemistry

Reactivity and Reactions Practice Problems

Practice 1

Consider the following sequence of steps:

1. A → B
2. B + C → D + E
3. E + A → 2F

1. Which species may be described as (i) reactant, (ii) product, and (iii) intermediate?
2. Write the net chemical equation.
3. Indicate the molecularity of each step.
4. If the second step is rate determining, write the rate expression.

Solution 1

1. (i) A, C; (II) D, F; (iii) B, E.
2. 2A + C → D + 2F (add steps 1, 2, and 3)
3. (1) unimolecular, (2) bimolecular, (3) bimolecular.
4. Rate = k[C][A], since A is needed to make the intermediate, B.

Practice 2

Give the conjugate acid of:

1. CH₃NH₂
2. CH₃O^–
3. CH₃OH
4. :H^–
5. :CH₃ ^–
6. H₂C=CH₂.

Solution 2

1. CH₃NH₃ ⁺
2. CH₃OH
3. CH₃OH₂ ⁺
4. H₂, (e) CH₄
5. H₃CCH₂ ⁺.