General Organic Chemistry PYQs Set 16 (PDF)

Set 16 of 22 · Questions 451-480 of 650

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Mere Teacher · Previous Year Questions NEET Chemistry · General Organic Chemistry · Set 16 (Q451-480)
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451. $Which one of the following pairs represents stereoisomerism?$ (1) $Structural isomerism and geometrical isomerism$ (2) $Optical isomerism and geometrical isomerism$ (3) $Chain isomerism and rotational isomerism$ (4) $Linkage isomerism and geometrical isomerism.$ 452. $Identify the correct statement in the following:$ (1) $Dimethyl ether and ethanol are chain isomers.$ (2) $Ethanoic acid and methyl methanoate are position isomers.$ (3) $n-butane and isobutane are functional isomers.$ (4) $Propan-1-ol and propan-2-ol are position isomers.$ 453. $Which of the following is a primary halide?$ (1) $Iso-propyl iodide$ (2) $Secondary butyl iodide$ (3) $Tertiary butyl bromide$ (4) $Neo-hexyl chloride$ 454. $Given below are two statements : Statement I : C_{2} H_{5} OH and AgCN both can generate nucleophile. Statement II : KCN and AgCN both will generate nitrile nucleophile with all reaction conditions.$ (1) $Statement I is true but statement II is false$ (2) $Both statement I and statement II are true$ (3) $Statement I is false but statement II is true$ (4) $Both statement I and statement II are false$ 455. $Identify the chiral molecule among the following.$ (1) $Isopropyl alcohol$ (2) $2-Pentanol$ (3) $1-Bromo-3-butene$ (4) $Isobutyl alcohol$ 456. $Statement-1 : Molecules that are not superimposable on their mirror images are chiral. because Statement-2 : All chiral molecules have chiral centres.$ (1) $Statement-1 is true, statement-2 is true; statement-2 is a correct explanation for statement-1.$ (2) $Statement-1 is true, statement-2 is true; statement-2 is NOT a correct explanation for statement-1.$ (3) $Statement-1 is true, statement-2 is false.$ (4) $Statement-1 is false, statement-2 is true.$ 457. $Williamson synthesis of ether is an example of$ (1) $Nucleophilic addition$ (2) $Electrophilic addition$ (3) $Electrophilic substitution$ (4) $Nucleophilic substitution$ 458. $Chromatographic technique/s based on the principle of differential adsorption is/are A. Column chromatography B. Thin layer chromatography C. Paper chromatography Choose the most appropriate answer from the options given below:$ (1) $B only$ (2) $A only$ (3) $A & B only$ (4) $C only$ 459. $Kjeldahl’s method is used in the estimation of$ (1) $nitrogen$ (2) $halogens$ (3) $sulphur$ (4) $oxygen.$ 460. $Which of the following compounds reacts with ethyl magnesium bromide and also decolourizes bromine water solution :$ (1) (2) (3) (4) 461. $Among the following the weakest base is :$ (1) $C6H5CH2NH2$ (2) $C6H5CH2NHCH3$ (3) $O2N.CH2NH2$ (4) $CH3NHCHO$ 462. $Bottles containing C_{6} H_{5} I and C_{6} H_{5} C H_{2} I lost their original labels. They were labelled A and B for testing. A and B were separately taken in a test tube and boiled with NaOH solution. The end solution in each tube was made acidic with dilute H N O_{3} and then some A g N O_{3} solution was added. Substance B gave a yellow precipitate. Which one of the following statements is true for this experiment ?$ (1) $A was C_{6} H_{5} I$ (2) $A was C_{6} H_{5} C H_{2} I$ (3) $B was C_{6} H_{5} I$ (4) $Addition of H N O_{3} was unnecessary$ 463. $Which of the following presents the correct order of the acidity in the given compounds ?$ (1) $BrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOH$ (2) $FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH$ (3) $CH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH$ (4) $FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH$ 464. $Among the given organic compounds, the total number of aromatic compounds is$ (1) (2) (3) (4) 465. $Two possible stereo-structures of CH3CHOH.COOH, which are optically active, are called.$ (1) $Diastereomers$ (2) $Atropisomers$ (3) $Enantiomers$ (4) $Mesomers$ 466. $The compound having only primary hydrogen atoms is :$ (1) $Isobutene$ (2) $2, 3-Dimethylbutene - 1$ (3) $Cyclohexane$ (4) $Propyne$ 467. $In the presence of peroxide, hydrogen chloride and hydrogen iodide do not give anti-Markovnikov addition to alkenes because :$ (1) $both are highly ionic$ (2) $one is oxidising and the other is reducing$ (3) $one of the steps is endothermic in both the cases$ (4) $all the steps are exothermic in both the cases.$ 468. $Tertiary alkyl halides are practically inert to substitution by S_{N} 2 mechanism because of:$ (1) $steric hinderance$ (2) $inductive effect$ (3) $instability$ (4) $insolubility$ 469. $In the presence of peroxide, HCl and HI do not give anti-Markownikoff's addition to alkenes because:$ (1) $One of the steps is endothermic in HCl and HI.$ (2) $Both HCl and HI are strong acids.$ (3) $HCl is oxidizing and the HI is reducing.$ (4) $All the steps are exothermic in HCl and HI.$ 470. $Which one of the following pair represents stereo isomerism :-$ (1) $Linkage isomerism and Geometrical isomerism$ (2) $Chain isomerism and Rotational isomerism$ (3) $Optical isomerism and Geometrical isomerism$ (4) $Structural isomerism and Geometrical isomerism.$ 471. $The decreasing order of the stability of the ions : CH3 — C^{+} H —CH3 CH3— C^{+} H —OCH3 CH3— C^{+} H —COCH3 (I) (II) (III)$ (1) $I > II > III$ (2) $III > II > I$ (3) $II > III > I$ (4) $II > I > III$ 472. $The C - H bond and C - C bond in ethane are formed by which of the following types of overlap?$ (1) $s p^{3} - s and s p^{3} - s p^{3}$ (2) $s p^{2} - s and s p^{2} - s p^{2}$ (3) $sp-s and sp - sp$ (4) $p - s and p - p$ 473. $Which of the following on heating with aqueous KOH, produces acetaldehyde ?$ (1) $C H_{3} C H_{2} Cl$ (2) $C H_{2} C l C H_{2} Cl$ (3) $C H_{3} C H C l_{2}$ (4) $C H_{3} COCl$ 474. $Which one of the following acids does not exhibit optical isomerism?$ (1) $Lactic acid$ (2) $Tartaric acid$ (3) $Maleic acid$ (4) $α-amino acid$ 475. $Acid catalyzed hydration of alkenes except ethene leads to the formation of$ (1) $Mixture of secondary and tertiary alcohols$ (2) $Mixture of primary and secondary alcohols$ (3) $Secondary or tertiary alcohol$ (4) $Primary alcohol$ 476. $Carbocation as an intermediate is likely to be formed in the reaction :$ (1) $Propene + Cl_{2} \to h ν 2-Chloropropane$ (2) $Acetone + HCN \to - OH Acetonecyanohydrin$ (3) $Ethyl bromide + Aq. KOH \to Δ Ethyl alcohol$ (4) $Hexane \to Anhy . AlCl_{3} / HCl 2-Methylpentane$ 477. $Match List I with List II LIST I (Technique) A. Distillation B. Fractional distillation C. Steam distillation D. Distillation under reduced pressure LIST II (Application) I. Separation of glycerol from spent-lye II. Aniline - Water mixture III. Separation of crude oil fractions IV. Chloroform- Aniline Choose the correct answer from the options given below:$ (1) $A-IV, B-I, C-II, D-III$ (2) $A-IV, B-III, C-II. D-I$ (3) $A-I. B-II, C-IV, D-III$ (4) $A-II, B-III. C-I, D-IV$ 478. $The chemical system that is non-aromatic is$ (1) (2) (3) (4) 479. $Which of the following alcohol gives the best yield of dialkyl ether on being heated with a trace of sulphuric acid ?$ (1) $2-Pentanol$ (2) $Cyclopentanol$ (3) $2-Methyl-2-butanol$ (4) $1-Pentanol$ 480. $The final product formed when Methyl amine is treated with N a N O_{2} and HCl is :$ (1) $Diazomethane$ (2) $Methylalcohol$ (3) $Methylcyanide$ (4) $Nitromethane$