Which of the following statements regarding the molecule `CH_(2)=C=CH_(2)` is NOT correct?

Options

A. Both the `pi` bonds are present in the same plane
B. The central carbon atom is sp hybridized while the terminal atoms are `sp^(2)` hybridized
C. the molecular is linear
D. the molecule contains six `sigma` bonds and two `pi` bonds.

Answer

To determine which statement regarding the molecule `CH₂=C=CH₂` (allene) is NOT correct, we will analyze the properties and characteristics of the molecule step by step.

### Step 1: Identify the Structure of Allene
The molecule `CH₂=C=CH₂` is known as allene. It consists of three carbon atoms and is characterized by having two double bonds between the central carbon and the two terminal carbons.

**Hint:** Remember that allene has a unique structure due to the arrangement of its double bonds.

### Step 2: Count Sigma and Pi Bonds
In allene:
- Each carbon atom forms sigma (σ) bonds with hydrogen and other carbon atoms.
- The double bonds consist of one sigma bond and one pi (π) bond each.

For `CH₂=C=CH₂`:
- The central carbon (C) is bonded to two terminal carbons (C) and has two pi bonds.
- Total sigma bonds = 6 (2 from each C-H bond and 1 from each C-C bond).
- Total pi bonds = 2 (one from each double bond).

**Hint:** Count the bonds carefully; remember that each double bond consists of one sigma and one pi bond.

### Step 3: Determine Hybridization
- The terminal carbon atoms (C) are involved in three sigma bonds (two with hydrogen and one with the central carbon), indicating they are sp² hybridized.
- The central carbon atom is involved in two sigma bonds and two pi bonds, indicating it is sp hybridized.

**Hint:** Recall that sp hybridization occurs when there are two sigma bonds and sp² hybridization occurs when there are three sigma bonds.

### Step 4: Analyze Molecular Geometry
- The geometry of the allene molecule is linear due to the arrangement of the double bonds. The two pi bonds are perpendicular to each other, which is a unique feature of allenes.

**Hint:** Consider how the geometry affects the molecular shape and bond angles.

### Step 5: Evaluate the Given Statements
Now, let's evaluate the statements regarding the molecule:
1. Both pi bonds are in the same plane. (This is NOT correct; they are perpendicular to each other.)
2. The central atom is sp hybridized, and the terminal atoms are sp² hybridized. (This is correct.)
3. The molecule is linear. (This is correct.)
4. The molecule contains 6 sigma bonds and 2 pi bonds. (This is correct.)

### Conclusion
The statement that is NOT correct is:
**"Both pi bonds are in the same plane."**

### Final Answer
The answer to the question is that the statement "Both pi bonds are in the same plane" is NOT correct regarding the molecule `CH₂=C=CH₂`.