Classify the reagents shown in bonds in the following equations as nucleophilies or electrophiles. Use curved-arrow notation to show the electron movement.
(a) `CH_3COOH + HO^(Ө) rarr CH_3COO^(Ө) + H_2 O`
(b) `CH_3COCH_3 + NC^(Ө) rarr CH_3C(CN) OHCH_3`

Explanation

To solve the problem, we will classify the reagents in the given reactions as nucleophiles or electrophiles and show the electron movement using curved-arrow notation.

### Step-by-Step Solution:

#### (a) Reaction:
`CH₃COOH + HO⁻ → CH₃COO⁻ + H₂O`

1. **Identify the Reactants**: The reactants are acetic acid (CH₃COOH) and hydroxide ion (HO⁻).
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