Dr. Sangeeta Khanna Ph.D 1 CHEMISTRY COACHING CIRCLE D:\Important Data\2016\+1\Org\Test\GT-5\Grand Test -V (organic Chemistry) Level - 1.

Transcription

1 1 EMISTRY ING IRLE :\Important ata\016\+1\rg\test\gt-5\grand Test -V (organic hemistry) Level - 1.docx

2 LEVEL 1 ( ) TPI: IUP NMING, GENERL RGNI EMISTRY & ISMERISM RE INSTRUTINS REFULLY 1. The test is of 1 hour duration.. The maximum marks are This test consists of 40 questions. SETIN (Single nswer Type) Negative Marking [-1] This Section contains 40 multiple choice questions. Each question has four choices ), ), ) and ) out of which NLY NE is correct. (Mark only ne choice) 40 4 = 160 Marks 1. The IUP name of = is 5 a. -vinyl--ethyl--propene b. -Ethyl--vinylprop--ene c. -Ethylpenta-1, -diene d. none l. The IUP name of the compound is : a. Toluene carbonyl chloride b. -Methyl benzene carbonyl chloride c. 5-Methyl benzoyl chloride d. 5-Methyl benzene carbonyl chloride. n electrophilic reagent must have a. a vacant orbital b. an orbital containing one electron c. an orbital containing two electrons d. a positive charge on it 4. The hybridization states of the carbon atom (1) and carbon atom () in the compound 1 N are respectively a. sp and sp b. sp and sp c. sp and sp d. sp and sp 5. The IUP name of the compound a., -iethyl-4-methyl-5-isopropyl octane b., -iethyl-5-isopropyl-4-methyl octane c. 4-Isopropyl-5-methyl-6,6-diethyl octane d. 6,6-iethyl-4-isopropyl-5-methyl octane r. Sangeeta Khanna Ph. EMISTRY ING IRLE :\Important ata\016\+1\rg\test\gt-5\grand Test -V (organic hemistry) Level - 1.docx

3 6. mong the following carbon radicals, the stability decreases in the order a. ( ) > = > ( ) > b. ( ) > ( ) > = > c. = > ( ) > ( ) > d. ( ) > ( ) > > = 7. Which of the following chemical systems is/are nonaromatic? I II III IV a. II b. IV c. II and IV d. None of the above 8. Which of the following is the correct order of decreasing stability? a. Θ > = Θ Θ > Θ b. Θ > = Θ > Θ c. Θ Θ d. = Θ Θ Θ 9. Which of the following statement is RRET regarding the inductive effect? a. it implies the atom s ability to cause bond polarization b. it implies the transfer of lone pair of electrons from more electronegative atom to the lesser electronegative atom in a molecule c. it implies the displacement of electron from less electronegative atom to the more electronegative atom in a molecule d. it increases with increase in distance 10. Which of the following is the correct order of stability of following carbocation? ; ; ; (I) N (II) (III) a. I > II > III > IV b. III > IV > I > II c. III > I > IV > II d. II > III > IV > I 11. Which of the following is the correct order of increasing +M effect? (IV) N N a. > > b. > > r. Sangeeta Khanna Ph. EMISTRY ING IRLE :\Important ata\016\+1\rg\test\gt-5\grand Test -V (organic hemistry) Level - 1.docx

4 N N c. > > d. > 1. Which of the following carbanion is least stable? a. b. c. d. 1 Sol. arbanion stability M N 1. Which of the following position is reactive for electrophilic attack N a. 1,, 8 b. 1,, 5 c. 10, 8, 6 d. 1,, Which of the following compound is meta directing due to reverse yperconjugation effect. N l N a. b. c. d. 15. The compound have a. Twelve 1 hydrogen atoms only b. Two and twelve 1 hydrogen atoms c. Two hydrogen atoms only d. Twelve 1 - and Two -hydrogen atoms 16. Which of the following resonating structures is most unstable? a. b. c. d. Sol. (b) is most unstable because both parts of cycle are nti aromatic r. Sangeeta Khanna Ph. 4 EMISTRY ING IRLE :\Important ata\016\+1\rg\test\gt-5\grand Test -V (organic hemistry) Level - 1.docx

5 17. The correct order of nucleophilicity is: a. N F b. c. N F d. F F N N 18. egree of unsaturation in is: 19. a. b. c. 4 d. 5 x y z rrange the ( ) bonds x, y & z in decreasing order of their bond dissociation energies in homolysis. a. y > x > z b. z > x > y c. z > y > x d. y > z > x Sol x z E E E 1 ighly unstable Stable due to hyper conjugation Stable due to resonance + hyperconjugation y so bond dissociation energy order is E 1 < E < E 0. The functional groups present in ortisone are: ortisone a. Ether, alkene, alcohol b. lcohol, ketone, alkene, ether c. lcohol, ketone, ester d. Ether, amine, ketone 1. Which of the following alkenes is the most stable? a. b. c. d. Sol. onjugated dienes are most stable r. Sangeeta Khanna Ph. 5 EMISTRY ING IRLE :\Important ata\016\+1\rg\test\gt-5\grand Test -V (organic hemistry) Level - 1.docx

6 . Which one among the following carbocations has the longest life? a. ( ) b. c. d. = Sol. Maximum resonance. The type of isomerism exhibited by the component with formula 4 10 is/are a. chain and position b. functional and position c. metamerism d. chain, position, functional and metamerism Sol. lcohol & ether are functional isomer 4. ompound 4 11 N can exhibit a. Position isomerism b. Metamerism c. Functional isomerism d. ll the three 5. Which among the following is likely to show geometrical isomerism? a. = b. = c. (l) = ( ) d. = = l 6. The lowest ydrocarbon which can exhibit geometrical isomerism is Sol. a. Ethene b. Propane c. 1-utene d. imethyl cyclobutane 7. The Z-isomer from the following is (i) (ii) (iii) l r F (iv) l r F a. only (i) b. only (iii) c. only (i) & (iii) d. both (i) & (iv) 8. The possible number of alkynes with the formula 5 8 is a. b. c. 4 d. 5 Sol. ; ; 9. Which of the following exhibit geometrical isomerism? a. = lr b. = Ir c. = l d. ( ) = lr r. Sangeeta Khanna Ph. 6 EMISTRY ING IRLE :\Important ata\016\+1\rg\test\gt-5\grand Test -V (organic hemistry) Level - 1.docx

7 0. The most stable conformation of n-butane is a. Skew boat b. Eclipsed c. Gauche d. Staggered 1. The order of stability of the following carbocations is P. Q. F R. S. a. P > Q > R > S b. S > R > P > Q c. Q > P > R > S d. S > R > Q > P Sol. The groups in the options given exert only inductive effect except in R, S exert +I effect. Q exerts I effect. +I effect decreases the positive charge of carbocation. It becomes strong as size of alkyl groups increases. I effect increases the positive charge of carbocation and destabilizes it so the order of stability is S > R > P > Q.. Which of the following pair of structures represent the same compound? l a. = l, l = l b. = = =, = c. =, = d. = and. n alkane (molecular weight 7) upon chlorination gives one monochlorination product. The alkane is a. -Methylbutane b. n-pentane c., -imethylpropane d. yclohexane l Sol. l 4. Which of the following alkene is most reactive in reaction with r. a. ( ) = ( ) b. = c. ( ) = d. = r. Sangeeta Khanna Ph. 7 EMISTRY ING IRLE :\Important ata\016\+1\rg\test\gt-5\grand Test -V (organic hemistry) Level - 1.docx

8 Sol. / \ 5. In which of the following reactions Markownikov s rule is not observed i. l ii. rganic peroxide rganic peroxide r iii. iv. r r a. i, ii b. ii, iii c. iii, iv d. i, iv Sol. Product is r (opposite to Markownikov s Rule); Markovnikoff s Rule is not obeyed for symmetrical Reagent 6. Which of the following will show Tautomerism = (i) (ii) (iii) ( ) (iv) (v) 5 a. i, ii, iii b. i, ii, v c. i, ii, iii, iv d. i, iv, v = = Sol. 7. The order of activity of the various o- and p- director is ; ; (-bond) a. > > > l b. > > > l c. > > l > d. > l > > 5 r. Sangeeta Khanna Ph. 8 EMISTRY ING IRLE :\Important ata\016\+1\rg\test\gt-5\grand Test -V (organic hemistry) Level - 1.docx

9 8. Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds l N 1 4 a. 1 > > > 4 b. 4 > > > 1 c. > 1 > > 4 d. > > 1 > 4 9. In which of the following alkene intermediate carbocation rearrange on addition of r. \ a. / b. c. d. shif t Sol. 40. Which among the following statement is not correct? a. F is more stable than l b. l is more stable than [triplet] c. Singlet arbene ( ) is less stable than triplet carbene ( ) d. Triplet carbene is biradical Sol. F is more stable than l due to stable back bonding l is less stable due to I effect of l. is less stable than ( ) according to und s Rule. r. Sangeeta Khanna Ph. 9 EMISTRY ING IRLE :\Important ata\016\+1\rg\test\gt-5\grand Test -V (organic hemistry) Level - 1.docx