Arrange the following substance in the ascending order of the number of constituent element(s) present in them.
(a) Sodium bicarbonate, (b) Calcium carbonate
( c) Water, (d) Copper

Options

A. d,c,b,a
B. c,b,a,d
C. b,a,d,c
D. a,b,c,d

Explanation

To solve the problem of arranging the substances in ascending order based on the number of constituent elements, we will analyze each substance one by one.

### Step-by-Step Solution:

1. **Identify the Constituent Elements of Each Substance:**
- **Sodium Bicarbonate (NaHCO₃):**
- Elements: Sodium (Na), Hydrogen (H), Carbon (C), Oxygen (O)
- Total constituent elements: 4

- **Calcium Carbonate (CaCO₃):**
- Elements: Calcium (Ca), Carbon (C), Oxygen (O)
- Total constituent elements: 3

- **Water (H₂O):**
- Elements: Hydrogen (H), Oxygen (O)
- Total constituent elements: 2

- **Copper (Cu):**
- Elements: Copper (Cu)
- Total constituent elements: 1

2. **Count the Number of Constituent Elements:**
- Sodium Bicarbonate: 4 elements
- Calcium Carbonate: 3 elements
- Water: 2 elements
- Copper: 1 element

3. **Arrange the Substances in Ascending Order:**
- Start with the substance that has the least number of elements:
- Copper (1 element)
- Water (2 elements)
- Calcium Carbonate (3 elements)
- Sodium Bicarbonate (4 elements)

4. **Final Arrangement:**
- The ascending order of the substances based on the number of constituent elements is:
- Copper < Water < Calcium Carbonate < Sodium Bicarbonate
- In terms of the letters given in the options:
- D (Copper) < C (Water) < B (Calcium Carbonate) < A (Sodium Bicarbonate)

### Final Answer:
The substances arranged in ascending order of the number of constituent elements are:
**D < C < B < A** (or in letters: D, C, B, A)

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