Choose the correct chemical structure for every single acronym used below: A B C DQuestion 2 4 0 . 1 pts Predict the FINAL ( ? ) product for each of the following reaction or synthetic chain: 4 1 . – = M g B r H 2 O H 2 O → 2 . M e 2 S 1 . O 3 L i A l H 4 N a B H 4 H 2 O MeOH A B C D
Answer
Chemistry MCQ Solutions: Pyridine Structure & Reaction Product
🧪 Question 20: Identify the Correct Structure of Pyridine (Py)
Pyridine has the molecular formula C₅H₅N and is an aromatic compound with one nitrogen atom in a six-membered ring.
Structural Analysis of Options:
- Option A: Two nitrogen atoms at positions 1 and 4. Incorrect — Not pyridine.
- Option B: Two nitrogen atoms at positions 1 and 3. Incorrect — Not pyridine.
- Option C: No nitrogen, formula C₆H₆ (benzene). Incorrect
- Option D: One nitrogen atom, formula C₅H₅N. Correct — This is pyridine.
✅ Final Answer: Option D
🧪 Question 24: Predict the Final Product of a Reaction Sequence
Reaction Summary: An alkene is subjected to a two-step process:
- Ozonolysis: O₃ / Me₂S cleaves the double bond, producing benzaldehyde and acetone.
- Grignard Reaction: PhMgBr adds to benzaldehyde, followed by hydrolysis (H₂O), yielding a secondary alcohol.
Product Description: A secondary alcohol with:
- Two phenyl groups
- One hydroxyl group (–OH)
- One hydrogen
✅ Final Answer: Option D
🟩 Summary of Correct Answers
- Question 20: Option D — Structure of Pyridine
- Question 24: Option D — Grignard Reaction Final Product