Identify the CORRECT product in the following reaction:

The question involves identifying the correct product from a given chemical reaction. The reaction is likely a Diels-Alder reaction, a pericyclic process in which a diene reacts with a dienophile to form a cyclic product.
Step 1: Understand the Reaction
The Diels-Alder reaction is between:
Step 2: Analyze the Reactants
In the given reaction, the diene is furan, and the dienophile appears to be a maleimide derivative. Furan is a five-membered aromatic compound with two conjugated double bonds, making it a suitable diene.
Step 3: Predict the Product
The reaction will likely result in a cycloaddition, forming a six-membered ring that includes the diene and dienophile. The product is typically an endo isomer, as it is generally the preferred product due to secondary orbital interactions.
Step 4: Identify the Correct Option
The correct product should feature a newly formed six-membered ring incorporating both the furan and the maleimide skeleton.

The above image represents the correct product formed by the addition of furan and the maleimide derivative. This structure keeps the endo rule in mind, where the larger substituent in the dienophile tends to orient below the newly formed ring.
Conclusion: The Diels-Alder addition results in a cyclohexene-like compound, matching the provided correct option. By understanding the mechanism and the preferred stereochemistry (endo rule), we deduce that the structure shown above is the correct product for the reaction.
The major product formed in the following reaction is
The compound, which upon mono-nitration using a mixture of HNO$_3$ and H$_2$SO$_4$, does NOT give the meta-isomer as the major product, is
The total number of tautomers for the following molecule (including the structure provided below) is ____________
