Question

Which of the following compound would be expected to have greatest florescence?

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is C

The question is about identifying which compound among the given options would exhibit the greatest fluorescence. Fluorescence is a property that allows compounds to emit light when they absorb light or other electromagnetic radiation. This property is often associated with compounds having conjugated π-electron systems, as these systems can stabilize the excited states needed for fluorescence.

Let's analyze each option:

1. Option 1: This compound has a conjugated system, but not as extended as others.
2. Option 2: This compound has some conjugated structure, but its ability to stabilize the excited state is lesser than expected.
3. Option 3: This compound has a highly conjugated π-electron system, which is often associated with strong fluorescence due to stabilization of excited states.
4. Option 4: While this compound has some conjugation, the structure is not as favorable as option 3 for strong fluorescence.

The correct answer is the compound in Option 3 due to its extensive conjugated system, which can effectively stabilize the excited state and result in greater fluorescence.

Hence, the compound expected to have the greatest fluorescence is the one shown in option 3.