Which reaction is suitable for the preparation of -chloroacetic acid?
1
Hell-Volhard Zelinsky reaction
2
Nef reaction
3
Stephen's reaction
4
Perkin condensation
Official Solution
Correct Option:
(1)
Step 1: Target Compound
-chloroacetic acid ( ) is a carboxylic acid where a chlorine atom is substituted at the alpha-carbon. Step 2: Identification of HVZ Reaction
The Hell-Volhard-Zelinsky (HVZ) reaction involves the halogenation of carboxylic acids at the -position using or in the presence of red phosphorus. Step 3: Reaction Mechanism
. Step 4: Conclusion
Therefore, the HVZ reaction is the suitable method. Final Answer: (A)
02
PYQ 2015
medium
chemistryID: met-2015
Coupling of diazonium salts of the following takes place in the order (Ascending)
1
IV - II - III - I
2
IV - III - II - I
3
II - IV - I - III
4
I - II - III - IV
Official Solution
Correct Option:
(1)
Step 1: Understanding the Concept:
Azo coupling is an electrophilic aromatic substitution reaction. Reactivity depends on electron density of the ring.
Step 2: Detailed Explanation:
Electron-donating groups increase reactivity, while electron-withdrawing groups decrease it.
Thus, the increasing order of reactivity is: IV Step 3: Final Answer:
IV - II - III - I
03
PYQ 2015
medium
chemistryID: met-2015
Which of the following would react most readily with nucleophiles?
1
A
2
B
3
C
4
D
Official Solution
Correct Option:
(3)
Step 1: Understanding the Concept:
Electron-withdrawing groups (NO ) influence nucleophilic substitution reactions.
Step 2: Detailed Explanation:
In this case, the meta-nitro group affects the reactivity differently compared to ortho and para positions due to reduced resonance interaction with the leaving group.
Step 3: Final Answer:
m-nitrophenyl chloride
About Reaction Mechanism - MET
Reaction Mechanism is a vital chapter for MET aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Reaction Mechanism PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Reaction Mechanism carry the most weight. Then, tackle the questions iteratively to solidify your understanding.
