Which compound form linear polymer due to H-bond
(a)`H_(2)O`
(b)`NH_(3)`
(c)`Hbr`
(d)`HCI`

Options

A. `H_(2)O`
B. `NH_(3)`
C. `Hbr`
D. `HCI`

Answer

To determine which compound forms a linear polymer due to hydrogen bonding, we will analyze each option provided:

### Step 1: Understanding Hydrogen Bonding
Hydrogen bonding occurs when hydrogen is covalently bonded to a highly electronegative atom (like nitrogen, oxygen, or fluorine) and is attracted to another electronegative atom. This type of bonding is crucial for the formation of polymers.

**Hint:** Identify which elements can form hydrogen bonds based on their electronegativity.

### Step 2: Analyzing Each Compound
- **(a) H₂O (Water)**: Water molecules can form hydrogen bonds with each other. However, the structure formed is not linear; instead, it creates a three-dimensional cage-like structure due to the tetrahedral arrangement of water molecules.

**Hint:** Consider the molecular geometry and how it affects polymer formation.

- **(b) NH₃ (Ammonia)**: Ammonia can also form hydrogen bonds. The nitrogen atom has a lone pair and can bond with hydrogen atoms from other ammonia molecules. This arrangement can lead to a linear polymer structure, as the molecules can align in a planar fashion.

**Hint:** Look for the potential for linear arrangements in the molecular structure.

- **(c) HBr (Hydrogen Bromide)**: HBr does not form significant hydrogen bonds due to the larger size of bromine and the relatively low electronegativity difference compared to nitrogen or oxygen. Therefore, it does not form polymers.

**Hint:** Evaluate the electronegativity and size of the atoms involved.

- **(d) HCl (Hydrogen Chloride)**: Similar to HBr, HCl does not form strong hydrogen bonds due to the larger size of chlorine and the lower electronegativity difference. Thus, it also does not form polymers.

**Hint:** Compare the bonding capabilities of HCl and HBr with those of NH₃ and H₂O.

### Step 3: Conclusion
From the analysis, it is clear that ammonia (NH₃) is the only compound among the options that can form a linear polymer due to hydrogen bonding.

### Final Answer
**(b) NH₃**