Which of the following has maximum bond angle around oxygen ?

Options

A. `CH_(3)-O-CH_(3)`
B. `C_(2)H_(5)-O-C_(6)H_(5)`
C.
D. Same in all

Answer

To determine which of the given compounds has the maximum bond angle around the oxygen atom, we can follow these steps:

### Step 1: Identify the Compounds
We need to identify the three compounds in question. Let's assume they are:
1. Compound A: CH3-O-CH3 (Dimethyl ether)
2. Compound B: CH3-O-C6H5 (Methoxybenzene)
3. Compound C: C6H5-O-C6H5 (Diphenyl ether)

### Step 2: Analyze the Hybridization of Oxygen
In all three compounds, the oxygen atom is sp³ hybridized. This is because oxygen forms two sigma bonds (with carbon) and has two lone pairs of electrons. The sp³ hybridization typically leads to a tetrahedral arrangement of electron pairs, but the presence of lone pairs will distort this shape.

### Step 3: Consider the Lone Pairs and Bond Pairs
In sp³ hybridization:
- There are 2 bond pairs (C-O bonds) and 2 lone pairs.
- The lone pairs will repel the bond pairs, leading to a bent shape.

### Step 4: Evaluate the Effect of Substituents
The nature of the substituents attached to the oxygen atom affects the bond angles:
- In Compound A (Dimethyl ether), both substituents are methyl groups (CH3), which are relatively small.
- In Compound B (Methoxybenzene), one substituent is a phenyl group (C6H5), which is bulkier than a methyl group.
- In Compound C (Diphenyl ether), both substituents are phenyl groups, making it the bulkiest.

### Step 5: Determine the Bond Angles
The presence of bulky groups increases the repulsion between the bond pairs and lone pairs, which can increase the bond angle:
- In Compound A, the bond angle will be slightly less than 109.5° due to the two lone pairs.
- In Compound B, the bond angle will be larger than in Compound A due to the presence of the phenyl group, which is bulkier than a methyl group.
- In Compound C, the bond angle will be the largest due to the presence of two phenyl groups, which create significant steric hindrance and increase the bond angle further.

### Conclusion
Thus, the compound with the maximum bond angle around the oxygen atom is **Compound C (Diphenyl ether)**.

### Final Answer
**Option 3: Diphenyl ether has the maximum bond angle around the oxygen atom.**

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