The compound containing coordinate bond is

Options

A. one electron from an atom is transferred to other
B. one electron each is lost from both the atoms
C. a pair of electrons is contributed by one atom and shared by both the atoms
D. a pair of electrons is transferred to the other atom.

Explanation

To determine which compound contains a coordinate bond, let's analyze the options provided and understand the concept of a coordinate bond step by step.

### Step-by-Step Solution:

1. **Understanding Coordinate Bond**:
A coordinate bond (also known as a dative bond) is a type of covalent bond where one atom donates a pair of electrons to another atom that does not contribute any electrons. This means that the bond is formed by the sharing of a pair of electrons, where both electrons come from the same atom.

2. **Analyzing the Options**:
- **Option A**: "One electron from an atom is transferred to another."
- This describes an ionic bond, not a coordinate bond.
- **Option B**: "One electron each is lost from both the atoms."
- This situation does not lead to bond formation; hence, it is incorrect.
- **Option C**: "A pair of electrons is contributed by one atom and shared by both the atoms."
- This accurately describes a coordinate bond, as one atom provides both electrons for the bond.
- **Option D**: "A pair of electrons is transferred to the other atom."
- This suggests a complete transfer of electrons, which is not characteristic of a coordinate bond.

3. **Conclusion**:
Based on the analysis, the correct answer is **Option C**: "A pair of electrons is contributed by one atom and shared by both the atoms." This option correctly describes the formation of a coordinate bond.