Aldehydes & Ketones PYQs Set 7 (PDF)

Set 7 of 10 · Questions 181-210 of 285

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Aldehydes & Ketones · Set 7 (Q181-210)
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181. $The oxidation of benzene by V_{2} O_{5} in the presence of air produces$ (1) $maleic anhydride$ (2) $benzoic acid$ (3) $benzaldehyde$ (4) $benzoic anhydride$ 182. $In which of the following reactions, the product is not correct?$ (1) $CH_{3} CHO \to LiAlH 4 CH_{3} CH_{2} OH$ (2) $C H_{3} C O C H_{3} Z n - H g H C l C H_{3} - O H (O H) - C H_{3}$ (3) $C H_{3} C H_{2} C H O (i) H_{2} N - N H_{2} (ii) KOH, Ethylene glycol /Δ C H_{3} C H_{2} C H_{3}$ (4) $C H_{3} C H_{2} C H O K M n O_{4} C H_{3} C H_{2} C O O H$ 183. $An ester (a) with molecular formula C_{9} H_{10} O_{2}, was treated with excess of C H_{3} M g B r and the complex so formed, was treated with H_{2} S O_{4} to give an olefin (b) . Ozonolysis of (b) gave a ketone with molecular formula C_{8} H_{8} O which shows + v e iodoform test. The structure of (a) is$ (1) $H_{3} C C H_{2} C O C_{6} H_{5}$ (2) $C_{2} H_{5} C O O C_{6} H_{5}$ (3) $C_{6} H_{5} C O O C_{2} H_{5}$ (4) $p - H_{3} C O - C_{6} H_{4} - C O C H_{3}$ 184. $Consider the following reaction,The product A is$ (1) $C_{6} H_{5} C H O$ (2) $C_{6} H_{5} O H$ (3) $C_{6} H_{5} C O C H_{3}$ (4) $C_{6} H_{5} C 1$ 185. $The above shown polymer is obtained when a carbonyl compound is allowed to stand. It is a white solid. The polymer is$ (1) $trioxane$ (2) $formose$ (3) $paraformaldehyde$ (4) $metaldehyde$ 186. $The product formed by the reaction of an aldehyde with a primary amine is$ (1) $carboxylic acid$ (2) $aromatic acid$ (3) $Schiff’s base$ (4) $ketone$ 187. $Identify the major product of the given reaction$ (1) $Benzoyl bromide$ (2) $Bromobenzene$ (3) $4-bromo benzoic acid$ (4) $3-bromo benzoic acid$ 188. $Residue (A) + HCl (dil) \to Compound (B) Structure of residue (A) and compound (B) formed respectively is. [A] [B]$ (1) (2) (3) (4) 189. $Which of the following represent the structure of methyl hemiacetal of formaldehyde?$ (1) $C H_{3} - C H (O C H_{3}) (O C H_{3})$ (2) $C H_{3} - C H (O H) (O C H_{3})$ (3) $H_{2} C (O H) (O C H_{3})$ (4) $H_{2} C (O C H_{3}) (O C H_{3})$ 190. $Reaction between acetone and methyl-magnesium bromide followed by hydrolysis will give [NEET 2020]$ (1) $sec-butyl alcohol$ (2) $tert-butyl alcohol$ (3) $iso-butyl alcohol$ (4) $iso-propyl alcohol$ 191. $The major organic product formed from the following reaction:$ (1) (2) (3) (4) 192. $In the following sequence of reactions, the final product D is :$ (1) $H_{3} C - C H_{2} - C H_{2} - C H_{2} - C H_{2} - C (= O) - H$ (2) $C H_{3} - CH = CH - C H_{2} - C H_{2} - C H_{2} - COOH$ (3) $H_{3} C - CH = CH - CH(OH) - C H_{2} - C H_{2} - C H_{3}$ (4) $C H_{3} - C H_{2} - C H_{2} - C H_{2} - C H_{2} - C (= O) - C H_{3}$ 193. $Identify the product in the following reaction :$ (1) (2) (3) (4) 194. $R MgX + CO_{2} Dry Ether Y H_{3} O^{+} RCOOH What is Y in the above reaction? [NEET 2022]$ (1) $RCOO^{-} Mg^{+} X$ (2) $R_{3} CO^{-} Mg^{+} X$ (3) $R COO^{-} X^{+}$ (4) $(RCOO)_{2} Mg$ 195. $The major product obtained in following reaction is:$ (1) (2) (3) (4) 196. $The product formed by the reaction of an aldehyde with a primary amine is [NEET 2016]$ (1) $ketone$ (2) $carboxylic acid$ (3) $aromatic acid$ (4) $Schiff's base$ 197. $The major product of the following reaction is : \frac{( i ) Ni / H _{2}}{( ii ) DIBAL - H}$ (1) (2) (3) (4) 198. $Suitable reagents X and Y, respectively, in the following reactions are$ (1) $aq. KOH, CrO_{3}$ (2) $alc. KOH, Cu /Δ$ (3) $aq. NaHCO_{3}, KMnO_{4}$ (4) $alc. KOH, NaOI$ 199. $The structure of A in the given reaction is:$ (1) (2) $R - C (O H) (C H_{3}) - C H_{2} C H_{3}$ (3) (4) 200. $The correct sequence of reagents for the following conversion will be :$ (1) $C H_{3} MgBr, H^{+} / C H_{3} OH, [Ag (N H_{3})_{2}]^{+} O H^{-}$ (2) $C H_{3} MgBr, [Ag (N H_{3})_{2}]^{+} O H^{-}, H^{+} / C H_{3} OH$ (3) $[Ag (N H_{3})_{2}]^{+} O H^{-}, C H_{3} MgBr, H^{+} / C H_{3} OH$ (4) $[A g (N H_{3})_{2}]^{+} O H^{-}, H^{+} / C H_{3} O H, C H_{3} M g B r$ 201. $Identify the major product formed in the following reaction sequence$ (1) (2) (3) (4) 202. $In the presence of peroxide, styrene reacts with HBr to give X . When X reacted with magnesium in dry ether followed by CO_{2} and hydrolysis gave Y . Treatment of Y with PCl_{5} and then next with H_{2}, Pd - BaSO_{4} gave Z . What is Z ?$ (1) (2) (3) (4) 203. $The semicarbazone of cyclobutanone is represented as$ (1) (2) (3) (4) 204. $Mixed aldol products obtained from aldol condensation of ethanal and propanone are$ (1) (2) (3) (4) 205. $Find out the major products from the following reaction sequence.$ (1) (2) (3) (4) 206. $The major product formed in the following reaction sequence is$ (1) $3-Hexanone$ (2) $2-Hexanone$ (3) $2-Methyl-3-pentanone$ (4) $Hexanal$ 207. $Aldol condensation is a popular and classical method to prepare α, β -unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?$ (1) (2) (3) (4) 208. $Consider the above reaction, the product ’ X ’ and ’ Y ’ respectively are:$ (1) (2) (3) (4) 209. $Which one of the following reactions does not represent correct combination of substrate and product under the given conditions ?$ (1) (2) (3) (4) 210. $The compound formed by the reaction of ethanal with semicarbazide contains_______ number of nitrogen atoms.$