PASSAGE-II : In all the organic compounds, the four valencies of carbon atom must be satisfied, either by single, double or triple bonds. It is not possible to get a compound in which the carbon atom has valencies either less or more than four. In these compounds carbon atoms can be linked together in the form of straight chains, branched chains or even ring chains.
The compound in which a double bond is present between two carbon atoms is

Options

A. ethane
B. ehtene
C. ethyne
D. ethanol

Answer

To answer the question regarding the compound in which a double bond is present between two carbon atoms, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Carbon Compounds**:
- Carbon can form various types of compounds based on the types of bonds (single, double, or triple) it can make.

2. **Identifying the Types of Hydrocarbons**:
- Hydrocarbons are categorized into three main types:
- **Alkanes**: These are saturated hydrocarbons with only single bonds (C-C).
- **Alkenes**: These are unsaturated hydrocarbons that contain at least one double bond (C=C).
- **Alkynes**: These are also unsaturated hydrocarbons but contain at least one triple bond (C≡C).

3. **Focusing on Alkenes**:
- Since the question specifically asks for a compound with a double bond between two carbon atoms, we focus on alkenes.

4. **Naming the Compound**:
- The simplest alkene is **Ethene** (C2H4), which has a double bond between two carbon atoms. The structure of ethene can be represented as:
```
H2C=CH2
```
- Here, the double bond (C=C) indicates that there are four electrons shared between the two carbon atoms.

5. **Conclusion**:
- Therefore, the compound in which a double bond is present between two carbon atoms is **Ethene**.