Structural isomers share molecular formula but differ in connectivity

Steps:

• Identify the molecular formula of compound T.
• Determine the molecular formula of each option.
• Compare formulas: isomers must match exactly.
• Check connectivity: correct isomer has same atoms bonded differently.

Why D is correct:

• Option D has the same molecular formula as T but different atom arrangement, per isomer definition.

Why the others are wrong:

• A: Different molecular formula from T.
• B: Same formula but identical connectivity to T (not an isomer).
• C: Different molecular formula from T.

Not enough information to specify exact formulas or structures.

Final answer: D