Welcome to the next set of JEE & NEET Chemistry practice questions on Aldehydes and Ketones! This section covers MCQs 151 to 300, carefully designed to strengthen your understanding of key concepts and reactions. By solving these multiple-choice questions, you will not only test your knowledge but also enhance problem-solving skills essential for competitive exams. Each question comes with a detailed explanation, helping you learn the logic behind every answer and prepare effectively for JEE and NEET.
JEE NEET Chemistry Aldehydes Ketones 151 to 300 MCQ
Questions with Answers (151–200)
Q151. Which compound on oxidation gives acetic acid?
a) Ethanol
b) Acetaldehyde
c) Ethyl chloride
d) Both (a) and (b)
Answer: Both (a) and (b). Ethanol → Acetaldehyde → Acetic acid.
Q152. The IUPAC name of CH₃–CO–CH₂–CH₃ is:
a) Butanone
b) Propanone
c) Pentanone
d) Butanal
Answer: Butanone (a ketone with four carbons).
Q153. Which test is used to distinguish aldehydes from ketones?
a) Fehling’s solution
b) Iodoform test
c) Schiff’s reagent
d) Both (a) and (c)
Answer: Both (a) and (c). Aldehydes reduce Fehling’s solution and give Schiff’s test.
Q154. The product of oxidation of acetaldehyde is:
a) Acetic acid
b) Acetone
c) Methanol
d) Ethanol
Answer: Acetic acid.
Q155. Benzaldehyde on oxidation with KMnO₄ gives:
a) Benzoic acid
b) Benzyl alcohol
c) Benzophenone
d) Toluene
Answer: Benzoic acid.
Q156. Which of the following compounds does not give iodoform test?
a) Acetone
b) Ethanol
c) Acetaldehyde
d) Methanol
Answer: Methanol. It lacks –COCH₃ group.
Q157. The reaction between benzaldehyde and acetone in presence of dilute NaOH is called:
a) Perkin reaction
b) Cross aldol condensation
c) Cannizzaro reaction
d) Friedel–Crafts acylation
Answer: Cross aldol condensation.
Q158. Formaldehyde reacts with ammonia to give:
a) Hexamethylenetetramine
b) Urotropine
c) Both (a) and (b)
d) Formamide
Answer: Both (a) and (b). Commonly called Urotropine.
Q159. The functional group –COOH can be detected by:
a) NaHCO₃ test
b) Iodoform test
c) Fehling’s solution
d) Schiff’s reagent
Answer: NaHCO₃ test (effervescence of CO₂).
Q160. The Cannizzaro reaction is given by aldehydes which:
a) Contain α-hydrogen
b) Do not contain α-hydrogen
c) Contain –OH group
d) Contain –COOH group
Answer: Do not contain α-hydrogen.
Q161. Acetone reacts with hydroxylamine to form:
a) Oxime
b) Hydrazone
c) Cyanohydrin
d) Aldoxime
Answer: Oxime.
Q162. In the iodoform test, yellow precipitate is of:
a) I₂
b) HI
c) CHI₃
d) ICl
Answer: CHI₃ (iodoform).
Q163. The compound that gives silver mirror test is:
a) Benzaldehyde
b) Acetone
c) Propanone
d) Acetophenone
Answer: Benzaldehyde.
Q164. The reduction product of formaldehyde is:
a) Methanol
b) Ethanol
c) Methane
d) Formic acid
Answer: Methanol.
Q165. The reaction of an aldehyde with alcohol in presence of dry HCl gives:
a) Acetal
b) Hemiacetal
c) Ketal
d) Ester
Answer: Acetal.
Q166. Acetic acid reacts with ethanol in presence of conc. H₂SO₄ to give:
a) Ethyl acetate
b) Ethyl alcohol
c) Acetaldehyde
d) Acetone
Answer: Ethyl acetate (esterification).
Q167. Which of the following acids is strongest?
a) Acetic acid
b) Formic acid
c) Trichloroacetic acid
d) Chloroacetic acid
Answer: Trichloroacetic acid.
Q168. Benzaldehyde undergoes Cannizzaro reaction in presence of:
a) Dilute H₂SO₄
b) Conc. NaOH
c) ZnCl₂
d) AlCl₃
Answer: Conc. NaOH.
Q169. The reduction product of acetic acid is:
a) Ethanol
b) Ethane
c) Ethanal
d) Propanol
Answer: Ethanol.
Q170. Which of the following compounds will not give aldol condensation?
a) Acetaldehyde
b) Acetone
c) Benzaldehyde
d) Propanal
Answer: Benzaldehyde (no α-hydrogen).
Q171. The acid obtained by oxidation of ethanol is:
a) Formic acid
b) Acetic acid
c) Propanoic acid
d) Benzoic acid
Answer: Acetic acid.
Q172. The compound which gives iodoform test is:
a) Acetaldehyde
b) Formaldehyde
c) Methanol
d) Benzaldehyde
Answer: Acetaldehyde.
Q173. The reduction product of acetone is:
a) Propan-2-ol
b) Propanal
c) Ethanol
d) Methanol
Answer: Propan-2-ol (isopropanol).
Q174. The product obtained when benzaldehyde is oxidised is:
a) Benzyl alcohol
b) Benzoic acid
c) Acetophenone
d) Benzene
Answer: Benzoic acid.
Q175. Which reagent is used in the Tollen’s test?
a) Ammoniacal silver nitrate
b) Fehling’s solution
c) Benedict’s solution
d) Schiff’s reagent
Answer: Ammoniacal silver nitrate.
Q176. Which aldehyde does not give Cannizzaro reaction?
a) Formaldehyde
b) Benzaldehyde
c) Acetaldehyde
d) p-Nitrobenzaldehyde
Answer: Acetaldehyde (it has α-hydrogen).
Q177. Acetaldehyde reacts with HCN to form:
a) Acetaldoxime
b) Acetone cyanohydrin
c) Acetaldehyde cyanohydrin
d) Acetaldazine
Answer: Acetaldehyde cyanohydrin.
Q178. Formaldehyde undergoes Cannizzaro reaction to give:
a) Formic acid + Methanol
b) Methanol + CO₂
c) Methanol only
d) Formic acid only
Answer: Formic acid + Methanol.
Q179. Acetaldehyde reacts with phenylhydrazine to form:
a) Hydrazone
b) Oxime
c) Schiff base
d) Cyanohydrin
Answer: Hydrazone.
Q180. The product formed by reduction of benzaldehyde is:
a) Benzene
b) Benzyl alcohol
c) Benzoic acid
d) Benzophenone
Answer: Benzyl alcohol.
Q181. Which of the following compounds gives positive Fehling’s test?
a) Formaldehyde
b) Acetaldehyde
c) Glucose
d) All of these
Answer: All of these.
Q182. Acetone reacts with semicarbazide to form:
a) Semicarbazone
b) Oxime
c) Schiff base
d) Hydrazone
Answer: Semicarbazone.
Q183. Oxidation of acetaldehyde with K₂Cr₂O₇ gives:
a) Acetic acid
b) Ethanol
c) Propanoic acid
d) Methanoic acid
Answer: Acetic acid.
Q184. Acetic acid reacts with PCl₅ to give:
a) Acetyl chloride
b) Acetone
c) Acetaldehyde
d) Acetic anhydride
Answer: Acetyl chloride.
Q185. The Cannizzaro reaction involves:
a) Oxidation and reduction simultaneously
b) Only oxidation
c) Only reduction
d) Substitution
Answer: Oxidation and reduction simultaneously (disproportionation).
Q186. Which one does not reduce Fehling’s solution?
a) Glucose
b) Benzaldehyde
c) Acetaldehyde
d) Formaldehyde
Answer: Benzaldehyde.
Q187. Reduction of acetic acid with LiAlH₄ gives:
a) Ethanol
b) Ethane
c) Methane
d) Acetaldehyde
Answer: Ethanol.
Q188. The reaction of benzaldehyde with concentrated NaOH to give benzyl alcohol and benzoic acid is called:
a) Aldol condensation
b) Perkin’s reaction
c) Cannizzaro reaction
d) Friedel–Crafts reaction
Answer: Cannizzaro reaction.
Q189. Acetone reacts with HCN in presence of KCN to give:
a) Acetone cyanohydrin
b) Acetone oxime
c) Acetone hydrazone
d) Acetone semicarbazone
Answer: Acetone cyanohydrin.
Q190. Acetaldehyde undergoes aldol condensation to form:
a) 3-Hydroxybutanal
b) Crotonaldehyde
c) Both (a) and (b)
d) Acetone
Answer: 3-Hydroxybutanal (which can further dehydrate to crotonaldehyde).
Q191. Formaldehyde reacts with ammonia to form:
a) Hexamethylenetetramine
b) Urotropine
c) Both (a) and (b)
d) Formamide
Answer: Both (a) and (b).
Q192. The reagent used to distinguish acetaldehyde and acetone is:
a) Tollen’s reagent
b) Schiff’s reagent
c) Fehling’s solution
d) All of these
Answer: All of these.
Q193. Oxidation of acetone with acidified K₂Cr₂O₇ gives:
a) Acetic acid + Formic acid
b) Acetaldehyde
c) Propanoic acid
d) Methanoic acid
Answer: Acetic acid + Formic acid.
Q194. The compound which does not give iodoform test is:
a) Acetone
b) Acetaldehyde
c) Ethanol
d) Formaldehyde
Answer: Formaldehyde.
Q195. The reduction product of acetone with NaBH₄ is:
a) Ethanol
b) Methanol
c) Isopropanol
d) Butanol
Answer: Isopropanol (2-propanol).
Q196. The oxidation product of ethanol is:
a) Methanol
b) Acetaldehyde
c) Acetic acid
d) Both (b) and (c)
Answer: Both (b) and (c), depending on oxidising agent strength.
Q197. Which reagent converts acetic acid into acetic anhydride?
a) P₂O₅
b) PCl₃
c) PCl₅
d) SOCl₂
Answer: P₂O₅.
Q198. Which aldehyde undergoes Cannizzaro reaction?
a) Acetaldehyde
b) Formaldehyde
c) Benzaldehyde
d) Both (b) and (c)
Answer: Both (b) and (c).
Q199. The functional group present in acetone is:
a) Aldehyde
b) Ketone
c) Alcohol
d) Carboxylic acid
Answer: Ketone.
Q200. The product obtained by reduction of benzaldehyde with H₂/Ni is:
a) Benzyl alcohol
b) Benzoic acid
c) Benzene
d) Benzophenone
Answer: Benzyl alcohol.
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In conclusion, practicing JEE NEET Chemistry Aldehydes Ketones 151 to 300 MCQ is a crucial step to strengthen your concepts and problem-solving skills. Regularly attempting JEE NEET Chemistry Aldehydes Ketones 151 to 300 MCQ will help you gain confidence and improve your speed for competitive exams. By dividing the questions into manageable sets, you can systematically complete all JEE NEET Chemistry Aldehydes Ketones 151 to 300 MCQ and identify your weak areas for revision. Ultimately, consistent practice of JEE NEET Chemistry Aldehydes Ketones 151 to 300 MCQ will ensure you are well-prepared to excel in both JEE and NEET exams.