Select the correct statement

Options

A. Deviation from normal tetrahedral angle in cycloalkane is called angle strain
B. Due to torsional strain eclipsed form has higher energy than the staggered form of a compound
C. Chair form of cyclohexane is the most stable conformation of cyclohexane
D. All of these

Answer

To solve the question of selecting the correct statement regarding cycloalkylenes, we will analyze each statement step by step.

### Step 1: Analyze the First Statement
The first statement claims that the deviation from the normal tetrahedral angle in cycloalkylenes is called angle strain.

- **Explanation**: In cyclopropane, for example, the bond angles are approximately 60 degrees, which is significantly less than the normal tetrahedral angle of 109.5 degrees. This difference in angle creates strain in the molecule, known as angle strain.

- **Conclusion**: The first statement is **correct**.

### Step 2: Analyze the Second Statement
The second statement asserts that due to torsional strain, the eclipsed form has higher energy than the staggered form of a compound.

- **Explanation**: In molecular conformations, the eclipsed form has atoms or groups that are aligned with each other, leading to increased electron-electron repulsion (torsional strain). In contrast, the staggered form has atoms or groups that are positioned away from each other, minimizing repulsion and thus having lower energy.

- **Conclusion**: The second statement is **correct**.

### Step 3: Analyze the Third Statement
The third statement mentions that the stability of the staggered form is greater than that of the eclipsed form.

- **Explanation**: As established in the previous analysis, the staggered conformation is more stable due to reduced torsional strain compared to the eclipsed conformation.

- **Conclusion**: The third statement is **correct**.

### Step 4: Analyze the Fourth Statement
The fourth statement claims that the chair form is more stable than the boat form.

- **Explanation**: In cyclohexane, the chair conformation is indeed more stable than the boat conformation due to less steric strain and torsional strain. The chair form allows for more favorable positioning of hydrogen atoms, reducing steric hindrance.

- **Conclusion**: The fourth statement is **correct**.

### Final Conclusion
All four statements are correct. Therefore, the correct answer is that all statements provided in the question are true.

---