General Organic Chemistry PYQs Set 10 (PDF)

Set 10 of 22 · Questions 271-300 of 650

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Mere Teacher · Previous Year Questions NEET Chemistry · General Organic Chemistry · Set 10 (Q271-300)
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271. $The compound CHCI = CHCHOHCOOH with molecular formula C4H5O3Cl can exhibit$ (1) $geometric, optical, position and functional isomerism.$ (2) $geometric. optical and functional isomerism only$ (3) $position and functional isomerism only$ (4) $geometric and optical isomerism only$ 272. $A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?$ (1) $+R effect of - CH_{3} groups$ (2) $-R effect of - CH_{3} groups$ (3) $Hyperconjugation$ (4) $-I effect of - CH_{3} groups$ 273. $Which of the following can be used as the halide component for Freidel -Crafts reaction$ (1) $Isopropyl chloride$ (2) $Chlorobenzene$ (3) $Bromobenzene$ (4) $Chloroethene$ 274. $Given below are two statements : Statement I : Tropolone is an aromatic compound and has 8 π electrons. Statement II: π electrons of > C = O group in tropolone is involved in aromaticity. In the light of the above statements choose the correct answer from the options given below:$ (1) $Statement I is true but Statement II is false$ (2) $Statement I is false but Statement II is true$ (3) $Both Statement I and Statement II are false$ (4) $Both Statement I and Statement II are true$ 275. $The increasing order of pK_{b} values of the following compounds$ (1) $I < II < IV < III$ (2) $I < II < III < IV$ (3) $II < I < III < IV$ (4) $II < IV < III < I$ 276. $Which of the following compounds will produce a precipitate with A g N O_{3} ?$ (1) (2) (3) (4) 277. $Which of the following is least reactive in a nucleophilic substitution reaction ?$ (1) $(CH3)3 C-Cl$ (2) $CH2 = CHCl$ (3) $CH3CH2Cl$ (4) $CH2 =CHCH2Cl$ 278. $In a SN2 substitution reaction which one of the following has the highest relative rate ? R — Br + Cl- DMF R — Cl + Br-$ (1) $(CH3)3 C — CH2Br$ (2) $CH3CH2Br$ (3) $CH3CH2CH2Br$ (4) $(CH3)2 CH — CH2Br$ 279. $The number of sp and s p^{2} carbon in hepta-1, 3-dien-5yne, respectively, are$ (1) $2,4$ (2) $4,3$ (3) $2,2$ (4) $2,5$ 280. $Correct statements for the given reaction are: (A) Compound B is aromatic (B) The completion of above reaction is very slow (C) 'A' shows tautomerism (D) The bond lengths of C - C in compound B are found to be same Choose the correct answer from the options given below.$ (1) $B, C and D only$ (2) $A, B and C only$ (3) $A, C and D only$ (4) $A, B and D only$ 281. $Which type of isomerism is shown by 2,3-dichlorobutane ?$ (1) $diastereomerism$ (2) $optical-isomerism$ (3) $geometric-isomerism$ (4) $structural-isomerism$ 282. $The number of isomers in C_{4} H_{10} O will be$ (1) $7$ (2) $8$ (3) $5$ (4) $6$ 283. $The strongest acid from the following is$ (1) (2) (3) (4) 284. $Designate whether each of the following compounds is aromatic or not aromatic.$ (1) $a, c, d, e, h aromatic and b, f, g not aromatic$ (2) $b, e, f, g aromatic and a, c, d, h not aromatic$ (3) $a, b, c, d aromatic and e, f, g, h not aromatic$ (4) $e, g aromatic and a, b, c, d, f, h not aromatic$ 285. $Reaction of trans 2-phenyl -1 - bromocyclopentane on reaction with alcoholic KOH produces:$ (1) $2-phenylcyclopentene$ (2) $1-phenylcyclopentene$ (3) $3-phenylcyclopentene$ (4) $4-phenylcyclopentene$ 286. $The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, are due to$ (1) $σ\to p (empty) and σ\to π* electron delocalisations.$ (2) $σ\to σ* and σ\to π electron delocalisations.$ (3) $σ\to p (filled) and σ\to π electron delocalisations.$ (4) $p (filled) \to σ* and σ\to π* electron delocalisations.$ 287. $he least acidic compound, among the following is:$ (1) $B$ (2) $D$ (3) $A$ (4) $C$ 288. $Identify the compound, which has maximum number of no bond resonance structures.$ (1) (2) (3) (4) 289. $The synthesis of 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are :$ (1) $BrCH2CH2CH2CH2CH3 and CH3CH2C\equivCH$ (2) $BrCH2CH2CH3 and CH3CH2CH2C\equivCH$ (3) $BrCH2CH2CH2CH2CH3 and CH3C\equivCH$ (4) $BrCH2CH2CH2CH3 and CH3CH2C\equivCH$ 290. $Which technique among the following, is most appropriate in separation of a mixture of 100 mg of p-nitrophenol and picric acid ?$ (1) $Steam distillation$ (2) $2-5 ft long column of silica gel$ (3) $Sublimation$ (4) $Preparative TLC (Thin Layer Chromatography)$ 291. $The correct increasing order of basic strength for the following compounds is :$ (1) $II < III < I$ (2) $III < I < II$ (3) $III < II < I$ (4) $II < I <III$ 292. $The incorrect statements regarding geometrical isomerism are : (A) Propene shows geometrical isomerism. (B) Trans isomer has identical atoms/groups on the opposite sides of the double bond. (C) Cis-but-2-ene has higher dipole moment than trans-but-2-ene. (D) 2-methylbut-2-ene shows two geometrical isomers. (E) Trans-isomer has lower melting point than cis isomer. Choose the correct answer from the options given below :$ (1) $(A) and (E) Only$ (2) $(A), (D) and (E) Only$ (3) $(B) and (C) Only$ (4) $(C), (D) and (E) Only$ 293. $The descending order of acidity for the following carboxylic acid is- (A) C H_{3} C O O H (B) F_{3} C - C O O H (C) C l C H_{2} - C O O H (D) F C H_{2} - C O O H (E) B r C H_{2} - C O O H Choose the correct answer from the options given below:$ (1) $B>C>D>E>A$ (2) $E>D>B>A>C$ (3) $B>D>C>E>A$ (4) $D>B>A>E>C$ 294. $Inductive effect involves$ (1) $displacement of σ -electrons$ (2) $delocalisation of π -electrons$ (3) $delocalisation of σ -electrons$ (4) $displacement of π -electrons.$ 295. $Given below are two statements: Statement I: (CH_{3})_{3} C \oplus is more stable than C \oplus H_{3} as nine hyperconjugation interactions are possible in (CH_{3})_{3} C \oplus . Statement II: C \oplus H_{3} is less stable than (CH_{3})_{3} C \oplus as only three hyperconjugation interactions are possible in C \oplus H_{3} . In the light of the above statements, choose the correct answer from the options given below$ (1) $Statement I is false but Statement II is true$ (2) $Statement I is true but Statement II is false$ (3) $Both Statement I and Statement II are true$ (4) $Both Statement I and Statement II are false$ 296. $+ I effect is shown by$ (1) $- CH_{3}$ (2) $- Br$ (3) $- Cl$ (4) $- NO_{2}$ 297. $Find out the statements which are not true.(A) Resonating structures with more number of covalent bonds and lesser charge separation are more stable.(B) In electromeric effect, an unsaturated system shows +E effect with nucleophile and -E effect with electrophile.(C) Inductive effect is responsible for high melting point, boiling point and dipole moment of polar compounds.(D) The greater the number of alkyl groups attached to the doubly bonded carbon atoms, higher is the heat of hydrogenation.(E) Stability of carbanion increases with the increase in s - character of the carbon carrying the negative charge. Choose the correct answer from the options given below:$ (1) $(B) & (D) only$ (2) $(A, (C) & (D) only$ (3) $(B) (D) & (E) only$ (4) $(A) (D) & (E) only$ 298. $The general formula of a cycloalkane is$ (1) $C_{n} H_{n}$ (2) $C_{n} H_{2 n - 2}$ (3) $C_{n} H_{2 n}$ (4) $C_{n} H_{2 n + 2}$ 299. $The correct order of nucleophilicity is$ (1) $F^{-} > O H^{-}$ (2) $H_{2} O > O H^{-}$ (3) $R O H > R O^{-}$ (4) $N H_{2}^{-} > N H_{3}$ 300. $Match the following: Test/Method Reagent (i) Lucas Test (a) C_{6} H_{5} SO_{2} Cl / aq. KOH (ii) Dumas method (b) HNO_{3} / AgNO_{3} (iii) Kjeldahl's method (c) CuO / CO_{2} (iv) Hinsberg test (d) Conc. HCI and ZnCl_{2} (e) H_{2} SO_{4}$ (1) $(i) - (b), (ii) - (d), (iii) - (e), (iv) - (a)$ (2) $(i) - (d), (ii) - (c), (iii) - (e), (iv) - (a)$ (3) $(i) - (b), (ii) - (a), (iii) - (c), (iv) - (d)$ (4) $(i) - (d), (ii) - (c), (iii) - (b), (iv) - (e)$