NEET Chemistry Questions Set 5: Organic Chemistry for 2025 Exam

NEET UG 2025: As the NEET exam approaches, aspirants are diving deep into advanced topics to gain a competitive edge, particularly in Organic Chemistry, a section known for its conceptual depth and tricky application-based problems.

To support students’ preparation, a curated set of 25 Organic Chemistry MCQs has been compiled by edufever academic team. These questions target core concepts, reaction mechanisms, functional group behavior, and stereochemistry—areas critical to scoring high in NEET.

Organic Chemistry MCQs: Set 4

1. The major product of the reaction between phenol and chloroform in the presence of NaOH is:
(a) Salicylic acid
(b) o-Hydroxybenzaldehyde
(c) p-Hydroxybenzaldehyde
(d) Benzoic acid

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2. Which compound gives a positive Iodoform test?
(a) Ethanol
(b) Methanol
(c) Acetone
(d) Both (a) and (c)

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3. The correct order of acidic strength is:
(a) Phenol > Ethanol > Acetic acid
(b) Acetic acid > Phenol > Ethanol
(c) Ethanol > Acetic acid > Phenol
(d) Phenol > Acetic acid > Ethanol

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4. Which reagent will distinguish between primary, secondary, and tertiary alcohols?
(a) Lucas reagent
(b) Tollen’s reagent
(c) Fehling’s solution
(d) 2,4-DNP

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5. Which compound shows tautomerism?
(a) Benzaldehyde
(b) Acetone
(c) Acetic acid
(d) Ethanol

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6. Which of the following compounds will undergo aldol condensation?
(a) Formaldehyde
(b) Benzaldehyde
(c) Acetaldehyde
(d) Acetic acid

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7. Which of the following is least reactive towards nucleophilic substitution?
(a) CH₃Cl
(b) CCl₄
(c) CH₃CH₂Cl
(d) CH₂=CHCl

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8. Which compound will give a positive carbylamine test?
(a) Aniline
(b) Benzamide
(c) Nitrobenzene
(d) Phenol

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9. The product of the reaction between CH₃MgBr and CO₂ followed by acid hydrolysis is:
(a) Acetic acid
(b) Ethanol
(c) Methanol
(d) Propanoic acid

10. Which is the correct order of basicity?
(a) NH₃ > CH₃NH₂ > (CH₃)₂NH
(b) (CH₃)₂NH > CH₃NH₂ > NH₃
(c) NH₃ > (CH₃)₂NH > CH₃NH₂
(d) CH₃NH₂ > NH₃ > (CH₃)₂NH

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11. The stability of carbocations follows the order:
(a) 1° > 2° > 3°
(b) 3° > 2° > 1°
(c) 2° > 3° > 1°
(d) 1° > 3° > 2°

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12. The product formed when benzene reacts with CH₃COCl in the presence of AlCl₃ is:
(a) Benzyl alcohol
(b) Acetophenone
(c) Toluene
(d) Benzaldehyde

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13. The product of the Hoffmann bromamide reaction of acetamide is:
(a) Acetic acid
(b) Acetone
(c) Methylamine
(d) Ethylamine

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14. Which of the following gives a violet colour with neutral FeCl₃?
(a) Phenol
(b) Alcohol
(c) Aldehyde
(d) Ketone

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15. Which compound undergoes the Cannizzaro reaction?
(a) Acetaldehyde
(b) Benzaldehyde
(c) Propanal
(d) Butanone

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16. The correct order of reactivity towards electrophilic substitution is:
(a) Nitrobenzene > Benzene > Toluene
(b) Toluene > Benzene > Nitrobenzene
(c) Benzene > Nitrobenzene > Toluene
(d) Nitrobenzene > Toluene > Benzene

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17. Which of the following is most acidic?
(a) Acetylene
(b) Ethylene
(c) Ethane
(d) Benzene

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18. Which of the following is an example of Markovnikov’s rule?
(a) CH₃CH=CH₂ + HBr → CH₃CHBrCH₃
(b) CH₃CH=CH₂ + HBr (peroxide) → CH₃CH₂CH₂Br
(c) CH₂=CH₂ + Br₂ → CH₂Br–CH₂Br
(d) CH₃CH=CH₂ + HCl → CH₃CHClCH₃

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19. Which of the following reacts fastest with Lucas reagent?
(a) 1° alcohol
(b) 2° alcohol
(c) 3° alcohol
(d) Methanol

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20. The hybridization of carbon in H–C≡N is:
(a) sp
(b) sp²
(c) sp³
(d) sp³d

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21. Which statement is true about the mesomeric effect?
(a) It operates through space
(b) It is temporary
(c) It involves the delocalization of π electrons
(d) It decreases with increasing chain length

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22. Which of the following is not aromatic?
(a) Benzene
(b) Cyclobutadiene
(c) Naphthalene
(d) Pyrrole

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23. Which of the following compounds will give optical isomerism?
(a) 2-chlorobutane
(b) 1-chlorobutane
(c) But-1-ene
(d) Butanoic acid

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24. Which of the following is an example of an enolizable ketone?
(a) Acetone
(b) Benzaldehyde
(c) Acetophenone
(d) All of these

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25. Which of the following compounds is most reactive towards an SN1 reaction?
(a) Methyl bromide
(b) Ethyl bromide
(c) tert-Butyl bromide
(d) Isopropyl bromide

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✅ Answer Key:

1.(b), 2.(d), 3.(b), 4.(a), 5.(b), 6.(c), 7.(b), 8.(a), 9.(a), 10.(b), 11.(b), 12.(b), 13.(c), 14.(a), 15.(b), 16.(b), 17.(a), 18.(a), 19.(c), 20.(a), 21.(c), 22.(b), 23.(a), 24.(d), 25.(c)

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Organic Chemistry remains a high-weightage topic in NEET UG, often determining a student’s rank. These 25 tough MCQs provide a comprehensive and challenging set for aspirants aiming to perfect their preparation. Mastering such questions ensures not only better scores but also builds confidence to handle the unexpected in the real exam.