**Answer:**

To determine which of the given options does not give an alkane with RMgX, we need to understand the reactions involved and the conditions required for the formation of alkane.

**1. Ph-OH (Phenol):**
Phenol does not give an alkane with RMgX. This is because phenol is an aromatic compound and does not undergo typical substitution reactions with Grignard reagents. Instead, it can react with RMgX to form an arylmagnesium halide.

**2. Cl-NH2 (Chloramine):**
Chloramine does not give an alkane with RMgX. Chloramine is not a suitable nucleophile to react with the Grignard reagent. Grignard reagents typically react with compounds that contain an electronegative atom (such as oxygen or nitrogen) to form a carbon-carbon bond and produce an alkane.

**3. CH3COOH (Acetic Acid):**
Acetic acid does not give an alkane with RMgX. Acetic acid is a carboxylic acid and does not undergo direct substitution reactions with Grignard reagents to form an alkane. Instead, it can react with RMgX to form a ketone.

**4. HCl (Hydrochloric Acid):**
HCl does give an alkane with RMgX. Hydrochloric acid can react with the Grignard reagent to form an alkane. The reaction proceeds by the following steps:
- The RMgX reacts with HCl to give the corresponding alkane, RH, and MgClX.
- The reaction can be represented as: RMgX + HCl → RH + MgClX

In summary, among the given options, phenol (Ph-OH), chloramine (Cl-NH2), and acetic acid (CH3COOH) do not give an alkane with RMgX. Only hydrochloric acid (HCl) reacts with RMgX to produce an alkane.

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