Which of the following compound has maximum "C-C" single bond length ?

Options

A. `CH_(2)CHC CH`
B. HC C C CH
C. `CH_(3)CHCH_(2)`
D. `CH_(2)CHCHCH_(2)`

Explanation

To determine which compound has the maximum "C-C" single bond length, we need to analyze the hybridization of the carbon atoms in each compound and how it affects bond lengths. Here’s a step-by-step solution:

### Step 1: Identify the Compounds
We are given four condensed formulas. We need to expand these to understand the structure and bonding:
1. **Option 1:** CH2=CH-CH≡CH
2. **Option 2:** HC≡C-CH≡C
3. **Option 3:** CH3-CH=CH2
4. **Option 4:** CH2=CH-CH2-CH3

### Step 2: Determine the Hybridization
For each compound, we will determine the hybridization of the carbon atoms involved in the "C-C" bonds.

1. **Option 1 (CH2=CH-CH≡CH):**
- The first carbon (CH2) is sp² hybridized (double bond with the second carbon).
- The second carbon (CH) is sp hybridized (double bond with the first carbon and triple bond with the third carbon).
- The third carbon (C≡CH) is also sp hybridized.
- The bond here is between sp² and sp, which will have a moderate bond length.

2. **Option 2 (HC≡C-CH≡C):**
- Both carbons are sp hybridized (triple bonds), leading to a very short bond length due to strong overlap.

3. **Option 3 (CH3-CH=CH2):**
- The first carbon (CH3) is sp³ hybridized.
- The second carbon (CH) is sp² hybridized (double bond with the third carbon).
- The bond here is between sp³ and sp², which will have a longer bond length than sp-sp or sp²-sp.

4. **Option 4 (CH2=CH-CH2-CH3):**
- The first carbon (CH2) is sp² hybridized.
- The second carbon (CH) is also sp² hybridized (double bond with the first carbon).
- The third carbon (CH2) is sp³ hybridized.
- The bond here is between sp² and sp³, which will also have a longer bond length.

### Step 3: Compare the Bond Lengths
- **sp-sp bond** (Option 2) has the shortest bond length due to strong overlap.
- **sp²-sp bond** (Options 1 and 4) has a moderate bond length.
- **sp³-sp² bond** (Option 3) has the longest bond length because the sp³ hybridized carbon has more electron density farther from the nucleus, leading to weaker attraction.

### Conclusion
From the analysis, **Option 3 (CH3-CH=CH2)** has the maximum "C-C" single bond length due to the presence of an sp³ hybridized carbon, which increases the bond length compared to other options.

### Final Answer
The compound with the maximum "C-C" single bond length is **Option 3 (CH3-CH=CH2)**.

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