Which of the following statements are correct ?

Options

A. Cationic detergents have germicidal properties
B. Bacteria can degrade the detergents containing highly branched chains
C. Some synthetic detergents can give foam even in ice cold water
D. Synthetic detergents are not soaps.

Explanation

To determine which statements are correct regarding detergents, we will analyze each statement one by one based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Statement 1: Ketionic detergent has germicidal properties.**
- Ketionic detergents, such as Cetyl Trimethyl Ammonium Bromide (Cetrimonium Bromide), are known for their ability to kill bacteria and other microorganisms. This property makes them useful in various cleaning and disinfecting applications.
- **Conclusion:** This statement is **correct**.

2. **Statement 2: Bacteria can degrade the detergent containing highly branched chains.**
- The transcript explains that bacteria cannot degrade detergents with highly branched chains because these chains are large and made of hydrocarbons, which are inorganic. Bacteria typically degrade organic materials, and thus they cannot break down these types of detergents.
- **Conclusion:** This statement is **incorrect**.

3. **Statement 3: Some synthetic detergents can give foam even in ice cold water.**
- According to the transcript, synthetic detergents are designed to produce foam even in cold water, which is one of their advantages over traditional soaps. They are effective in various temperatures and conditions.
- **Conclusion:** This statement is **correct**.

4. **Statement 4: Synthetic detergents are not soaps.**
- The transcript confirms that synthetic detergents are chemically distinct from soaps. Soaps are typically made from natural fats and oils, while synthetic detergents are manufactured from petrochemicals and do not form soap in the traditional sense.
- **Conclusion:** This statement is **correct**.

### Final Answer:
The correct statements are **1, 3, and 4**.