Question

Select the correct statement(s) regarding reaction (I)

• A. The major product is
• B. It involves nuclophilic substition
• C. DMSO acts as base
• D. It involves electrophilic aromatic substitution

Answer 1

Answer: (A), (B)

(A), (B)

Answer 2

Let's assume that the major product shown in option (A) is formed by the reaction of dihydropyran with 4-nitrophenol in the presence of an acid catalyst. The reaction is:

   O        +  4-nitrophenol  --H+-->  2-(4-nitrophenoxy)tetrahydropyran
  / \
 /   \
C=C   C-O-C
|     |   |
C-----C   C

The structure of 2-(4-nitrophenoxy)tetrahydropyran is:

    O
   / \
  /   \
 /     \
C2 - O - C(phenyl)
|     / \
 \   /   \
  \ /     \
   C3-----C6
   |       |
   C4-----C5
    \     /
     \   /
      \ /
       C1 (Oxygen)

Let's assume the drawing in (A) is indeed 2-(4-nitrophenoxy)tetrahydropyran. Then (A) is correct. The reaction involves nucleophilic attack, which can be considered as nucleophilic substitution in a broader sense. So, (B) is also correct. DMSO is a solvent, so (C) is incorrect. It is not electrophilic aromatic substitution, so (D) is incorrect.

Therefore, if the reaction is the acid-catalyzed reaction of dihydropyran with 4-nitrophenol, then both (A) and (B) are correct statements.