Which of the following compounds have more than one type of hybridisation for carbon?
(i) `HC-=CH`
(ii) `CH_(2)=CH-C-=CH`
(iii) `CH_(3)CH=CHCH_(3)`
(iv) `CH_(3)CH_(2)CH_(2)CH_(3)`

Options

A. (iii)
B. (i)
C. (ii) and (iii)
D. (i) and (iii)

Answer

To determine which of the given compounds have more than one type of hybridization for carbon, we will analyze each compound step by step.

### Step 1: Analyze Compound (i) `HC≡CH`
- The structure is H-C≡C-H.
- Each carbon in this compound is involved in a triple bond.
- For each carbon, there are 2 bonds (one triple bond counts as one bond) and no lone pairs.
- Hybridization = Number of bonds + Number of lone pairs = 2 + 0 = 2.
- Therefore, both carbons are **sp** hybridized.

### Conclusion for (i):
- **Hybridization Types**: Only **sp**.
- **More than one type?**: No.

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### Step 2: Analyze Compound (ii) `CH₂=CH-C≡CH`
- The structure is CH₂=CH-C≡C-H.
- For the first carbon (CH₂):
- Bonds: 2 (double bond with the second carbon) + 0 (no lone pairs) = 2.
- Hybridization = 2 → **sp²**.

- For the second carbon (CH):
- Bonds: 3 (double bond with the first carbon and single bond with the third carbon) + 0 = 3.
- Hybridization = 3 → **sp²**.

- For the third carbon (C≡C):
- Bonds: 2 (triple bond with the fourth carbon) + 0 = 2.
- Hybridization = 2 → **sp**.

- For the fourth carbon (C):
- Bonds: 1 (triple bond with the third carbon) + 0 = 1.
- Hybridization = 2 → **sp**.

### Conclusion for (ii):
- **Hybridization Types**: **sp²** and **sp**.
- **More than one type?**: Yes.

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### Step 3: Analyze Compound (iii) `CH₃-CH=CH-CH₃`
- The structure is CH₃-CH=CH-CH₃.
- For the first carbon (CH₃):
- Bonds: 4 (single bonds) + 0 = 4.
- Hybridization = 4 → **sp³**.

- For the second carbon (CH):
- Bonds: 3 (double bond with the third carbon) + 0 = 3.
- Hybridization = 3 → **sp²**.

- For the third carbon (CH):
- Bonds: 3 (double bond with the second carbon) + 0 = 3.
- Hybridization = 3 → **sp²**.

- For the fourth carbon (CH₃):
- Bonds: 4 (single bonds) + 0 = 4.
- Hybridization = 4 → **sp³**.

### Conclusion for (iii):
- **Hybridization Types**: **sp²** and **sp³**.
- **More than one type?**: Yes.

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### Step 4: Analyze Compound (iv) `CH₃-CH₂-CH₂-CH₃`
- The structure is CH₃-CH₂-CH₂-CH₃.
- All carbons are connected by single bonds.
- For each carbon:
- Bonds: 4 (single bonds) + 0 = 4.
- Hybridization = 4 → **sp³**.

### Conclusion for (iv):
- **Hybridization Types**: Only **sp³**.
- **More than one type?**: No.

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### Final Conclusion:
The compounds with more than one type of hybridization for carbon are:
- **(ii) CH₂=CH-C≡CH** (sp² and sp)
- **(iii) CH₃-CH=CH-CH₃** (sp² and sp³)

### Summary:
- **Answer**: (ii) and (iii) have more than one type of hybridization.

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