Which of the following statements is not true ? (a) Intermolecular hydrogen bonds are formed between two different molecules of compounds. (b)Intramolecular hydrogen bonds are formed between two different molecules of the same compounds. (c)Intramolecular hydrogen bonds are formed within the same molecule. (d) Hydrogen bonds have strong influence on the physical properties of a compound.

Options

A. Intermolecular hydrogen bonds are formed between two different molecules of compounds.
B. Intramolecular hydrogen bonds are formed between two different molecules of the same compounds.
C. Intramolecular hydrogen bonds are formed within the same molecule.
D. Hydrogen bonds have strong influence on the physical properties of a compound.

Explanation

To determine which statement is not true, let's analyze each option step by step:

1. **Option (a)**: "Intermolecular hydrogen bonds are formed between two different molecules of compounds."
- **Analysis**: This statement is true. Intermolecular hydrogen bonds occur between different molecules, which is consistent with the definition of "inter" meaning between.

2. **Option (b)**: "Intramolecular hydrogen bonds are formed between two different molecules of the same compounds."
- **Analysis**: This statement is not true. The prefix "intra" means within, so intramolecular hydrogen bonds are formed within the same molecule, not between different molecules. Therefore, this statement is incorrect.

3. **Option (c)**: "Intramolecular hydrogen bonds are formed within the same molecule."
- **Analysis**: This statement is true. Intramolecular hydrogen bonds indeed occur within a single molecule.

4. **Option (d)**: "Hydrogen bonds have strong influence on the physical properties of a compound."
- **Analysis**: This statement is also true. Hydrogen bonds significantly affect the boiling point, melting point, and solubility of compounds.

Based on the analysis above, the statement that is not true is **(b)**.

### Final Answer:
The statement that is not true is **(b)**: "Intramolecular hydrogen bonds are formed between two different molecules of the same compound."