“Organic Chemistry Structure Based Fill-Up Questions with Answers [NEET & JEE Practice]”

Structure-based Organic Fill-up Questions — (Interactive)

10 practice questions. Click an option (optional) then press Reveal Answer to check. Use Show All Answers to toggle every answer at once.

Q1

Identify the product:

Image shows: Ethanol → [O] → ?

A) CH₃CH₂OH (Ethanol) B) CH₃CHO (Ethanal) C) CH₃COOH (Acetic acid) D) CH₄ (Methane)

Answer: CH₃CHO (Ethanal) — oxidation of ethanol to aldehyde.

Q2

Identify the product:

Addition of Br₂ to ethene

A) CH₂=CH₂ B) CH₂Br–CH₂Br C) CH₂Cl–CH₂Cl D) CH₃CH₂Br

Answer: CH₂Br–CH₂Br (1,2-dibromoethane).

Q3

Identify the product:

Nitration of benzene

A) C₆H₆ B) C₆H₅NO₂ C) C₆H₅OH D) C₆H₅Cl

Answer: C₆H₅NO₂ (Nitrobenzene).

Q4

Identify the product:

Reduction of acetic acid with LiAlH₄

A) CH₃CH₂OH B) CH₃COOH C) CH₃CHO D) CH₄

Answer: CH₃CH₂OH (Ethanol) — LiAlH₄ reduces carboxylic acids to primary alcohols.

Q5

Identify the product:

Alkyl bromide → KCN

A) CH₃CH₂CN B) CH₃CH₂OH C) CH₃CH₂Br D) CH₃CH₂NH₂

Answer: CH₃CH₂CN (Ethyl cyanide / propionitrile depending on chain) — nucleophilic substitution with CN⁻.

Q6

Identify the product:

Oxidation of toluene with KMnO₄

A) C₆H₅CH₃ B) C₆H₅COOH C) C₆H₅OH D) C₆H₆

Answer: C₆H₅COOH (Benzoic acid) — side-chain oxidation of methylbenzene.

Q7

Identify the product:

Addition of HBr to propene (Markovnikov)

A) CH₃CHBrCH₃ B) CH₃CH₂CH₂Br C) CH₃CH=CH₂ D) CH₃CH₂OH

Answer: CH₃CHBrCH₃ (2-bromopropane) — Markovnikov addition of HBr.

Q8

Identify the product:

Dehydration of ethanol (conc. H₂SO₄, 170°C)

A) CH₂=CH₂ B) CH₃CH₂OH C) CH₃CH₂Cl D) CH₃CHO

Answer: CH₂=CH₂ (Ethene) — elimination (dehydration) of ethanol.

Q9

Identify the product:

Hydrolysis (aqueous NaOH) of ethyl chloride

A) CH₃CH₂OH B) CH₃CH₂Cl C) CH₃CH₂Br D) CH₃CHO

Answer: CH₃CH₂OH (Ethanol) — nucleophilic substitution with OH⁻.

Q10

Identify the product:

Electrophilic bromination of benzene (FeBr₃)

A) C₆H₅Br B) C₆H₅OH C) C₆H₅NO₂ D) C₆H₆

Answer: C₆H₅Br (Bromobenzene).

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