Aldehydes & Ketones PYQs Set 5 (PDF)

Set 5 of 9 · Questions 121-150 of 264

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Mere Teacher · Previous Year Questions NEET Chemistry · Aldehydes & Ketones · Set 5 (Q121-150)
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121. $Which of the following reagent is used for the following reaction? CH_{3} C H_{2} C H_{3} ? C H_{3} C H_{2} CHO$ (1) $Potassium permanganate$ (2) $Molybdenum oxide$ (3) $Copper at high temperature and pressure$ (4) $Manganese acetate$ 122. $Iodoform test is not given by$ (1) $ethanal$ (2) $ethanol$ (3) $2‐pentanone$ (4) $3‐pentanone$ 123. $Experimentally reducing a functional group cannot be done by which one of the following reagents ?$ (1) $Pt-C/ H_{2}$ (2) $Na/ H_{2}$ (3) $Pd-C/ H_{2}$ (4) $Zn/ H_{2} O$ 124. $The most suitable reagent for the conversion of R-CH2-OH \to R-CHO is$ (1) $KMnO4$ (2) $K2Cr2O7$ (3) $CrO3$ (4) $PCC (Pyridinium Chlorochromate)$ 125. $The correct structure of the product ‘A’ formed in the reaction$ (1) (2) (3) (4) 126. $When m ‐chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is (are)$ (1) (2) (3) (4) 127. $The number of products obtained in the following reaction is$ (1) $1$ (2) $3$ (3) $2$ (4) $4$ 128. $Which of the following reagents would distinguish cis‐cyclopenta‐l,2‐diol from the trans‐isomer?$ (1) $M n O_{2}$ (2) $Aluminium isopropoxide$ (3) $Acetone$ (4) $Ozone$ 129. $What is C in the following sequence of reaction? CH_{3} OH PCl_{3} A KCN B Hydrolysis C$ (1) $CH_{3} CH_{2} OH$ (2) $CH_{3} CHO$ (3) $CH_{3} COOH$ (4) $HOCH_{2} - CH_{2} OH$ 130. $Given below are two statements : Statement I: The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion. Statement II: The nucleophilic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product. choose the most appropriate answer from the options given below :$ (1) $Both Statement I and Statement II are true.$ (2) $Statement I is true but Statement II is false.$ (3) $Statement I is false but Statement II is true.$ (4) $Both Statement I and Statement II are false.$ 131. $The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha carbon, is [NEET 2016]$ (1) $a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.$ (2) $a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.$ (3) $a carbonyl compound with a hydrogen atom on its alpha carbon never equilibrates with its corresponding enol.$ (4) $a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.$ 132. $An organic compound A on treatment with N H_{3} gives B, which on heating gives C . C when treated with B r_{2} in the presence of KOH produces ethyl amine. Compound A is$ (1) $C H_{3} C O O H$ (2) $C H_{3} C H_{2} C H_{2} C O O H$ (3) $C H_{3} - C H (C H_{3}) - C O O H$ (4) $C H_{3} C H_{2} C O O H$ 133. $But-1-ene may be converted to butane by reaction with :$ (1) $Zn-HCl$ (2) $Sn-HCl$ (3) $Zn-Hg$ (4) $Pd/ H_{2}$ 134. $What are X and Y respectively in the following reaction? CH_{3} CH_{2} CHO + 2 Cu^{2 +} + OH^{-} \to X + Y + 3 H_{2} O$ (1) $CH_{3} CH_{2} COOH, Cu (OH)_{2}$ (2) $CH_{3} CH_{2} COO^{-}, Cu$ (3) $CH_{3} CH_{2} COOH, Cu_{2} O$ (4) $CH_{3} CH_{2} COO^{-}, Cu_{2} O$ 135. $Identify the major product from the following reaction sequence$ (1) (2) (3) (4) 136. $Amongst the following the reagent that would convert 2-hexyne into trans-2-hexene is$ (1) $H_{2} .Pt / O_{2}$ (2) $H_{2} .Pd / SO_{4}^{2-}$ (3) $Li / N H_{3} / C_{2} H_{5} OH$ (4) $N a B H_{4}$ 137. $Considering the below reaction, the major product among the following is: (1) Zn, HCl (2) C r_{2}, O_{3}, 773 K 10 - 20 atm$ (1) (2) (3) (4) 138. $Acetamide is treated with the following reagents separately Which one of these would yield methyl amine?$ (1) $N a O H - B r_{2}$ (2) $Sodalime$ (3) $Hot conc. H_{2} S O_{4}$ (4) $P C l_{5}$ 139. $Which among the above compound/s does/do not form Silver mirror when treated with Tollen's reagent?$ (1) $(I), (III) and (IV) only$ (2) $Only (IV)$ (3) $Only (II)$ (4) $(III) and (IV) only$ 140. $Hydrogenation of the adjoining compound in the presence of poisoned palladium catalyst gives.$ (1) $an optically active compound$ (2) $an optically inactive compound$ (3) $a racemic mixture$ (4) $a diastereomeric mixture$ 141. $1-Propanol and 2-Propanol can be best distinguished by :$ (1) $oxidation with alkaline K M n O_{4} followed by reaction with Fehling solution$ (2) $oxidation with acidic dichromate followed by reaction with Fehling solution$ (3) $oxidation by heating with copper followed by reaction with Fehling solution$ (4) $oxidation with concentrated H_{2} S O_{4} followed by reaction with Fehling solution$ 142. $Which of the following compounds will give positive test with Tollens’ reagent?$ (1) $Acetic acid$ (2) $Acetone$ (3) $Acetamide$ (4) $Acetaldehyde$ 143. $Which of the following reaction leads to the formation of benzonitrile?$ (1) $Reaction of bromobenzene with KCN$ (2) $Reaction of aniline with NaNO_{2} and HCl at 273 K followed by the reaction with CuCN$ (3) $Reaction of bromobenzene with NaNO_{2} and HCl at 273 K followed by the reaction with CuCN$ (4) $Reaction of aniline with KCN$ 144. $Given below are two statements : Statements I : Acidity of α -hydrogens of aldehydes and ketones is responsible for Aldol reaction. Statement II : Reaction between benzaldehyde and ethanal will NOT give Cross - Aldol product. In the light of the above statements, choose the most appropriate answer from the options given below :$ (1) $Statement I is correct but Statement II is incorrect$ (2) $Both Statement I and Statement II are correct$ (3) $Both Statement I and Statement II are incorrect$ (4) $Statement I is incorrect but Statement II is correct$ 145. $Consider the following reactions$ (1) (2) (3) (4) 146. $A compound A with molecular formula C_{10} H_{13} Cl give a white precipitate on adding silver nitrate solution. A on reacting with alcoholic KOH gives compound B as the main product. B on ozonolysis gives C and D. C gives Cannizaro reaction but not aldol condensation. D gives aldol condensation but not Cannizaro reaction. A is :$ (1) $C_{6} H_{5} - C H_{2} - C H_{2} - C H_{2} - C H_{2} -Cl$ (2) $C_{6} H_{5} - C H_{2} - C H_{2} - C H (C l) - C H_{3}$ (3) (4) $C_{6} H_{5} - C H_{2} - C (C H_{3}) (C H_{3}) - C l$ 147. $The gas liberated by the electrolysis of Dipotassium succinate solution is :$ (1) $Ethane$ (2) $Ethyne$ (3) $Ethene$ (4) $Propene$ 148. $Which one of the following reactions will not result in the formation of carbonation bond ?$ (1) $Reimer-Tieman reaction$ (2) $Friedel Craft's acylation$ (3) $Wurtz reaction$ (4) $Cannizzaro reaction$ 149. $Consider the reaction: R C H O + N H_{2} N H_{2} \to R C H = N - N H_{2} What sort of reaction is it?$ (1) $Electrophlic addition‐elimination reaction$ (2) $Free radical addition‐elimination reaction$ (3) $Electrophilic substitution‐elimination reaction$ (4) $Nudeophilic addition‐elimination reaction$ 150. $Match the following columns. Column I (Compound/reagent) (A). Methanol (B). ZnCl_{2} / Conc . HCl (C). Rectified spirit D Dil. KMnO_{4} Column II (Other name/ chemical/name of the process) (I). Lucas reagent (II). Baeyer’s reagent (III). Wood spirit (IV). 95 % C_{2} H_{5} OH (V). 75 % C_{2} H_{5} OH (VI). 90 % C_{3} H_{7} OH A B C D$ (1) $IV I III II$ (2) $III I VI II$ (3) $III I IV II$ (4) $III II V I$