Arrange the following substances in the ascending order of the number of constituent element(s) present in them.
(1) sodium bicarbonate (2) calcium carbonate (3) water (4) copper

Options

A. 4, 3, 2, 1
B. 3, 2, 1, 4
C. 4, 1, 2, 3
D. 1, 2, 3, 4

Explanation

To arrange the substances in ascending order of the number of constituent elements present in them, we will analyze each substance one by one:

1. **Copper (Cu)**: Copper is a pure metal and consists of only one element, which is copper itself.
- **Number of elements**: 1

2. **Water (H2O)**: Water is a compound made up of two elements: hydrogen and oxygen.
- **Number of elements**: 2

3. **Calcium Carbonate (CaCO3)**: Calcium carbonate is a compound that consists of three elements: calcium, carbon, and oxygen.
- **Number of elements**: 3

4. **Sodium Bicarbonate (NaHCO3)**: Sodium bicarbonate contains four elements: sodium, hydrogen, carbon, and oxygen.
- **Number of elements**: 4

Now, we can summarize the number of elements in each substance:
- Copper: 1 element
- Water: 2 elements
- Calcium Carbonate: 3 elements
- Sodium Bicarbonate: 4 elements

Next, we will arrange these substances in ascending order based on the number of constituent elements:

1. Copper (1 element)
2. Water (2 elements)
3. Calcium Carbonate (3 elements)
4. Sodium Bicarbonate (4 elements)

Thus, the ascending order of the substances based on the number of constituent elements is:
**Copper < Water < Calcium Carbonate < Sodium Bicarbonate**

### Final Answer:
**Copper (1) < Water (2) < Calcium Carbonate (3) < Sodium Bicarbonate (4)**

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