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Organic compounds containing Nitrogen WBCHSE Class 12 MCQ & Practice Questions

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Organic compounds containing Nitrogen Revision Guide for WBCHSE Class 12 Chemistry

Organic compounds containing Nitrogen is part of WBCHSE Class 12 Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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Top 20 Organic compounds containing Nitrogen MCQs with Answers

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WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

1. Nitrobenzene reduction Sn/HCl-এ প্রধান product?

  • A. Aniline
  • B. Phenol
  • C. Benzene
  • D. Benzoic acid
Answer: A
Explanation: Nitro group –NO2 reduction হয়ে –NH2; nitrobenzene থেকে aniline।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

2. Amines-এর basicity-এর মূল কারণ?

  • A. N-এর lone pair proton গ্রহণ করতে পারে
  • B. N no electron
  • C. all amines acidic
  • D. C=O group
Answer: A
Explanation: Nitrogen lone pair Lewis/Brønsted base হিসেবে H+ গ্রহণ করে।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

3. Aniline ammonia-এর তুলনায় কম basic কেন?

  • A. lone pair benzene ring-এ resonance-delocalized
  • B. aniline ionic
  • C. NH3 aromatic
  • D. N absent
Answer: A
Explanation: Aniline-এ N lone pair ring-এর π-system-এ delocalized, protonation-এর জন্য কম available।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

4. Alkyl amine-এ +I alkyl group সাধারণত basicity কী করে?

  • A. বাড়াতে সাহায্য করে
  • B. কমায় সবসময়
  • C. শূন্য করে
  • D. acidic করে
Answer: A
Explanation: Electron-releasing alkyl groups N-এর electron density/lone pair availability বাড়ায়।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

5. Carbylamine test কোন class amine দেয়?

  • A. Primary amines
  • B. Secondary only
  • C. Tertiary only
  • D. Amides
Answer: A
Explanation: 1° amines CHCl3 + alcoholic KOH-এর সঙ্গে foul-smelling isocyanide দেয়।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

6. Hinsberg test কী কাজে?

  • A. 1°,2°,3° amines distinguish
  • B. alcohol classify
  • C. aldehyde detect
  • D. ketone reduce
Answer: A
Explanation: Benzenesulfonyl chloride-এর সঙ্গে solubility/reactivity differences amine classes আলাদা করে।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

7. Primary aromatic amine + NaNO2/HCl at 0–5°C → ?

  • A. Diazonium salt
  • B. Amide
  • C. Nitrile
  • D. Alcohol directly
Answer: A
Explanation: Aniline diazotization-এ benzenediazonium chloride তৈরি হয়।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

8. Diazonium salts কম তাপমাত্রায় রাখা হয় কেন?

  • A. উচ্চ তাপমাত্রায় decomposition হতে পারে
  • B. freeze nitrogen
  • C. no reaction otherwise
  • D. colourless করার জন্য
Answer: A
Explanation: Aryl diazonium salts aqueous medium-এ উচ্চ তাপমাত্রায় অস্থিতিশীল ও hydrolyse/decompose করতে পারে।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

9. Benzenediazonium chloride + CuCl/HCl → ?

  • A. Chlorobenzene
  • B. Phenol
  • C. Aniline
  • D. Benzene only
Answer: A
Explanation: Sandmeyer reaction-এ diazonium group Cl দ্বারা প্রতিস্থাপিত হয়।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

10. Benzenediazonium chloride + CuCN → ?

  • A. Benzonitrile
  • B. Aniline
  • C. Benzoic acid directly
  • D. Phenol
Answer: A
Explanation: Sandmeyer cyanation-এ aryl diazonium → aryl nitrile।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

11. Benzenediazonium chloride + H2O, warm → ?

  • A. Phenol
  • B. Benzene
  • C. Aniline
  • D. Nitrobenzene
Answer: A
Explanation: Diazonium group hydrolysis-এ –OH দ্বারা replace হয়ে phenol হয়।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

12. Azo coupling-এ diazonium salt সাধারণত কিসের সঙ্গে reacts?

  • A. Activated aromatic ring যেমন phenol/aniline
  • B. alkane only
  • C. NaCl
  • D. CO2 only
Answer: A
Explanation: Electrophilic azo coupling activated aromatic compounds-এর সঙ্গে coloured azo compounds দেয়।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

13. Nitrile hydrolysis-এর final product কী?

  • A. Carboxylic acid
  • B. Alcohol only
  • C. Alkane
  • D. Amine only
Answer: A
Explanation: R–CN hydrolysis প্রথমে amide, শেষে R–COOH (acidic) বা carboxylate (basic) দেয়।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

14. Nitrile reduction LiAlH4/H2-এ কী দেয়?

  • A. Primary amine
  • B. Secondary alcohol
  • C. Carboxylic acid
  • D. Alkene
Answer: A
Explanation: R–C≡N reduction → R–CH2NH2, primary amine।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

15. Isocyanide-এর functional group?

  • A. R–N≡C
  • B. R–C≡N
  • C. R–NO2
  • D. R–NH2
Answer: A
Explanation: Isocyanide/isonitrile linkage R–N≡C।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

16. Cyanide/nitrile-এর functional group?

  • A. R–C≡N
  • B. R–N≡C
  • C. R–NHNH2
  • D. R–N=N–
Answer: A
Explanation: Nitrile group carbon-এর মাধ্যমে organic chain-এ যুক্ত: R–C≡N।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

17. KCN + alkyl halide প্রধানত কী দেয়?

  • A. Nitrile R–CN
  • B. Isocyanide R–NC
  • C. Amine
  • D. Nitroalkane
Answer: A
Explanation: Ionic KCN-এ carbon end attack করে alkyl nitrile গঠন করে।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

18. AgCN + alkyl halide প্রধানত কী দেয়?

  • A. Nitrile
  • B. Isocyanide
  • C. Alcohol
  • D. Alkene
Answer: B
Explanation: Covalent AgCN-এ N-end nucleophilicity বেশি উপলব্ধ, ফলে isocyanide।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

19. Nitroalkane reduction-এ সাধারণত কী পাওয়া যায়?

  • A. Amine
  • B. Carboxylic acid
  • C. Ketone only
  • D. Ether
Answer: A
Explanation: –NO2 group reduction হয়ে –NH2।

WBCHSE Class 12 Chemistry · Organic compounds containing Nitrogen · Very Hard

20. Amide ও amine-এর মধ্যে কোনটি কম basic?

  • A. Amide
  • B. Amine
  • C. সমান সবসময়
  • D. কোনোটিই নয়
Answer: A
Explanation: Amide N lone pair carbonyl-এর সঙ্গে resonance-delocalized হওয়ায় proton গ্রহণে কম available।

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