The negative part of the addendum adds on to the carbon atom joined to the least number of hydrogen atoms. This statemet is called.

Options

A. baeyer's strain steory
B. markovnikov's rule
C. Newmann theory
D. Peroxide effect

Answer

To answer the question, we need to identify the statement that describes the behavior of the negative part of an addendum (like HX) during the addition reaction to alkenes. The statement in question is known as Markovnikov's Rule.

### Step-by-Step Solution:

1. **Understanding the Reaction**: When an alkene reacts with a hydrogen halide (HX), the reaction involves the addition of H and X across the double bond of the alkene.

2. **Identifying the Components**: In the reaction, H is the positive part (H⁺) and X is the negative part (X⁻).

3. **Applying Markovnikov's Rule**: According to Markovnikov's Rule, when HX adds to an unsymmetrical alkene, the hydrogen atom (H⁺) will attach to the carbon atom that has the greater number of hydrogen atoms already attached to it. Conversely, the halide (X⁻) will attach to the carbon atom that has the fewer hydrogen atoms.

4. **Example for Clarity**: For example, in the case of propene (CH₃-CH=CH₂), when HCl is added, the H will bond with the second carbon (which has more hydrogen atoms) and the Cl will bond with the first carbon (which has fewer hydrogen atoms). This results in the formation of isopropyl chloride.

5. **Conclusion**: Therefore, the statement "The negative part of the addendum adds on to the carbon atom joined to the least number of hydrogen atoms" is a description of Markovnikov's Rule.

### Final Answer:
This statement is called **Markovnikov's Rule**.