How many of these molecules can have any type of hydrogen bonding.
Glucose, HF, `-OH, R-COOH, R_(2)NH, "CCl"_(3)CHO,Ph-Br, " o - nitro phenol", PH_(3)`.

Answer

To determine how many of the given molecules can exhibit hydrogen bonding, we will analyze each molecule one by one. Hydrogen bonding occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (like O, N, or F) and is attracted to another electronegative atom.

### Step-by-Step Solution:

1. **Glucose (C₆H₁₂O₆)**:
- Glucose has multiple hydroxyl (-OH) groups. Each hydroxyl group can form hydrogen bonds with other molecules.
- **Conclusion**: Glucose can participate in hydrogen bonding.

2. **HF (Hydrogen Fluoride)**:
- HF is a classic example of hydrogen bonding. The hydrogen atom is bonded to fluorine, which is highly electronegative.
- **Conclusion**: HF can participate in hydrogen bonding.

3. **R-OH (Alcohol)**:
- Alcohols have hydroxyl groups (-OH) that can form hydrogen bonds with other alcohol molecules or with water.
- **Conclusion**: R-OH can participate in hydrogen bonding.

4. **R₂NH (Secondary Amine)**:
- In secondary amines, the nitrogen atom has a lone pair and is bonded to two alkyl groups and one hydrogen. The hydrogen can form hydrogen bonds with electronegative atoms.
- **Conclusion**: R₂NH can participate in hydrogen bonding.

5. **RCOOH (Carboxylic Acid)**:
- Carboxylic acids contain a carboxyl group (-COOH) which can form strong hydrogen bonds due to the presence of both a carbonyl (C=O) and a hydroxyl (O-H) group.
- **Conclusion**: RCOOH can participate in hydrogen bonding.

6. **CCl₃CHO (Trichloroacetaldehyde)**:
- This molecule has a carbonyl group (C=O) and a hydrogen atom attached to the carbon. The hydrogen can participate in hydrogen bonding with other electronegative atoms.
- **Conclusion**: CCl₃CHO can participate in hydrogen bonding.

7. **Ph-Br (Bromobenzene)**:
- Bromobenzene does not have any hydrogen atoms bonded to highly electronegative atoms. Therefore, it cannot participate in hydrogen bonding.
- **Conclusion**: Ph-Br cannot participate in hydrogen bonding.

8. **o-Nitrophenol**:
- o-Nitrophenol has a hydroxyl group (-OH) and a nitro group (-NO₂) which can facilitate intramolecular hydrogen bonding. The hydrogen of the hydroxyl can bond with the oxygen of the nitro group.
- **Conclusion**: o-Nitrophenol can participate in hydrogen bonding.

9. **PH₃ (Phosphine)**:
- PH₃ does not have highly electronegative atoms bonded to hydrogen, and thus it does not exhibit hydrogen bonding.
- **Conclusion**: PH₃ cannot participate in hydrogen bonding.

### Summary of Findings:
- Molecules that can participate in hydrogen bonding: Glucose, HF, R-OH, R₂NH, RCOOH, CCl₃CHO, o-Nitrophenol.
- Molecules that cannot participate in hydrogen bonding: Ph-Br, PH₃.

### Total Count:
- Total molecules that can exhibit hydrogen bonding = 7 (Glucose, HF, R-OH, R₂NH, RCOOH, CCl₃CHO, o-Nitrophenol).

### Final Answer:
**7 molecules can have any type of hydrogen bonding.**

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