Which of the following are meta directors ?
` -NO_(2), -SO_(3)H, -Cl, -OH, - NH_(2), - CHO`

Explanation

To determine which of the given groups are meta directors, we need to understand the concept of electron withdrawing and electron donating groups in the context of electrophilic aromatic substitution reactions.

### Step-by-Step Solution:

1. **Identify Electron Withdrawing vs. Electron Donating Groups:**
- **Electron Withdrawing Groups (EWGs)** tend to pull electron density away from the aromatic ring, making the ortho and para positions less favorable for electrophilic attack. Instead, they direct electrophiles to the meta position.
- **Electron Donating Groups (EDGs)** increase electron density at the ortho and para positions, making them more favorable for electrophilic attack.

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