JEE Main Organic — Functional Groups – Topic Test
JEE Main Organic — Functional Groups – Topic Test is an online topic test in the JEE Main pattern, covering Organic — Functional Groups. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.
Topics in this test
| Topic | Questions |
|---|---|
| Organic — Functional Groups | 30 |
Difficulty: 15 medium · 15 hard
Organic — Functional Groups MCQ questions with answers
The first 3 of 30 questions. Unlock the series for the rest, each with a solution.
Q1. Which one of the following is NOT a correct description of the reduction of an alkyl nitrile (R–C≡N)?
निम्नलिखित में से कौन-सा एक ऐल्किल नाइट्राइल (R–C≡N) के अपचयन का सही वर्णन नहीं है?
- A. Catalytic hydrogenation (H2/Ni) can reduce the nitrile to the amine / उत्प्रेरकीय हाइड्रोजनीकरण (H2/Ni) नाइट्राइल को ऐमीन में अपचयित कर सकता है
- B. The product primary amine is R–CH2–NH2 / उत्पाद प्राथमिक ऐमीन R–CH2–NH2 है
- C. Reduction gives a primary amine containing one more carbon atom than the group R / अपचयन से एक प्राथमिक ऐमीन मिलता है जिसमें समूह R की तुलना में एक अधिक कार्बन परमाणु होता है
- D. Reduction of R–C≡N with LiAlH4 gives a secondary amine / R–C≡N का LiAlH4 के साथ अपचयन एक द्वितीयक ऐमीन देता है
Solution
Catalytic hydrogenation or LiAlH4 reduction of a nitrile gives a primary amine R–CH2–NH2 with one more carbon than R, not a secondary amine; the other statements are correct.
नाइट्राइल का उत्प्रेरकीय हाइड्रोजनीकरण या LiAlH4 अपचयन R की तुलना में एक अधिक कार्बन वाला प्राथमिक ऐमीन R–CH2–NH2 देता है, द्वितीयक ऐमीन नहीं; अन्य कथन सही हैं।
Q2. Which one of the following alkanes cannot be prepared by the Wurtz reaction?
निम्नलिखित में से कौन-सा ऐल्केन वुर्ट्ज़ अभिक्रिया द्वारा नहीं बनाया जा सकता?
- A. Methane / मेथेन
- B. 2,3-Dimethylbutane / 2,3-डाइमेथिलब्यूटेन
- C. Butane / ब्यूटेन
- D. Ethane / एथेन
Solution
The Wurtz reaction couples two alkyl groups from alkyl halides, so every product must contain at least two carbon atoms; methane, having only one carbon, cannot be obtained by this coupling. Ethane, butane and 2,3-dimethylbutane result from coupling methyl, ethyl and isopropyl halides respectively.
वुर्ट्ज़ अभिक्रिया में ऐल्किल हैलाइडों से प्राप्त दो ऐल्किल समूहों का युग्मन होता है, अतः प्रत्येक उत्पाद में कम से कम दो कार्बन परमाणु अवश्य होने चाहिए; मेथेन में केवल एक कार्बन होने के कारण इसे इस युग्मन द्वारा प्राप्त नहीं किया जा सकता। एथेन, ब्यूटेन और 2,3-डाइमेथिलब्यूटेन क्रमशः मेथिल, एथिल और आइसोप्रोपिल हैलाइडों के युग्मन से प्राप्त होते हैं।
Q3. Which one of the following, when added to aqueous sodium bicarbonate solution, dissolves with brisk effervescence of carbon dioxide?
निम्नलिखित में से कौन-सा, जलीय सोडियम बाइकार्बोनेट विलयन में मिलाने पर कार्बन डाइऑक्साइड के तीव्र बुदबुदाहट के साथ घुल जाता है?
- A. Ethanol / एथेनॉल
- B. p-Cresol / p-क्रेसॉल
- C. Phenol / फ़ीनॉल
- D. Acetic acid / एसिटिक अम्ल
Solution
Only carboxylic acids are strong enough to liberate CO₂ from bicarbonate; phenol, p-cresol and ethanol are too weakly acidic to do so, which is the basis of distinguishing acids from phenols.
केवल कार्बोक्सिलिक अम्ल ही बाइकार्बोनेट से CO₂ मुक्त करने के लिए पर्याप्त प्रबल होते हैं; फ़ीनॉल, p-क्रेसॉल तथा एथेनॉल इतने दुर्बल अम्लीय हैं कि ऐसा नहीं कर सकते, और यही अम्लों को फ़ीनॉलों से अलग करने का आधार है।
Frequently asked questions
How many questions are in the JEE Main Organic — Functional Groups – Topic Test?
30 questions for 30 marks, to be answered in 30 minutes.
Is there negative marking in the JEE Main Organic — Functional Groups – Topic Test?
Yes — 0.25 marks are deducted for each wrong answer, as in the real exam pattern.
Which topics does the JEE Main Organic — Functional Groups – Topic Test cover?
Organic — Functional Groups (30 questions).
Is the JEE Main Organic — Functional Groups – Topic Test free?
It is part of the JEE Main 2027 Mock Test Series (104 tests, ₹299). You can first try Basic Concepts & Atomic Structure – Topic Test for free.
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