Class -XII Topic : GOC DPP - 1 to 3. DPP No - 01
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1 UCLE CEMISTRY CLASSES FR IIT-JEE DPP RGAIC CEMISTRY Target IIT-JEE 2016 Class -XII Topic : GC DPP - 1 to 3 DPP o The inductive effect : implies the atom's and group s ability to cause bond polarization increases with increase of distance implies the transfer of lone pair of electrons from more electronegative atom to the lesser electronegative atom in a molecule (D) implies the transfer of lone pair of electrons from lesser electronegative atom to the more electronegative atom in a molecule 2. Which of the following orbital overlaps is involved in the formation of the carbon carbon single bond in the molecule C C C = sp 3 - sp 3 sp 2 - sp 3 sp - sp 2 (D) sp 3 - sp 3. Inductive effect involves : Delocalisation of - electrons Delocalisation of - electron Partial displacement of - electrons (D) Displacement of lone pair electrons. 4. Which of the following has incorrect direction of Inductive effect. C 3 C C - (D) C 3 C C 3 C 3 5. Decreasing I effect of given groups is - (a) C (b) 2 (c) 2 (d) F b > a > d > c b > c > d > a c > b > d > a (D) c > b > a > d 6. Which of the following resonating structure contributes equally to the resonance hybrid. C3 C C C C3 C3 C C C C3 C C 3 C 3 C 2 C C = C C 3 - C 3 C - (D) = C C = - C C = C 2 rganic Chemistry By Page o. # 1
2 7. Which of the following compounds have delocalisation of -electrons? C 3 C = (D) = C C = 8. Which of the following statements is not true about the resonance contributing structures of a resonance hybrid - Contributing structures contribute to the resonance hybrid in proportion of their energies Equivalent contributing structures make the resonance very important Contributing structures represent hypothetical molecules having no real existence (D) Contributing structures are less stable than the resonance hybrid 9. Which of the following is not a pair of resonating structures?.. C ; C C 3 C = CC 3 ; C 3 C = ; (D) ; 10. In which of the following delocalisation of -electron is possible. = C C = C C = C3 C C3 (D) = C C = 11. Which of the following species have conjugated system? C = C = C 2 2 : (D) All of these 12. The type of hybrid orbitals used by C and in the formation of C bond in pyrrole is : sp 2 and sp 3 sp 2 and sp sp 2 and sp 2 (D) sp 2 and s rganic Chemistry By Page o. # 2
3 DPP o Which type of orbitals C and use in the formation of C bond in furan, sp 2 and sp 3 sp 2 and sp sp 2 and sp 2 (D) sp 2 and p 2. Which is the most stable resonance form? (D) 3. I C2 C C C C C2 II C2 C C C C C 2 III C 2 C C C C C 2 Among these three canonical structures (through more are possible) what would be their relative contribution in the hybrid : I > II > III III > II > I I > III > II (D) III > I > II 4. I II III The stability order of these canonical structures is : I > II > III II > III > I I > III > II (D) III > I > II 5. Which of the following statements is T true? Resonance forms must obey normal valency rules Resonance forms are in equilibrium The hybrid is more stable than the individual resonance forms (D) Resonance forms differ only in the distribution of electrons 6. The correct order of decreasing hyperconjugative effect of the following compounds is - C 3 > C 3 > (C 3 ) 2 C (C 3 ) 2 C > C 3 > C 3 (C 3 ) 2 C > C 3 > C 3 (D) C 3 > C 3 > (C 3 ) 2 C rganic Chemistry By Page o. # 3
4 7. Which of the following molecule has longest C=C bond length? = C = C 3 C = C 3 C3 C C C2 (D) C 3 C3 C C2 C 3 8. In hyperconjugation there is overlap between : p- and -orbitals 2 - orbitals d-and--orbtial (D) -and - orbitals 9. yperconjugation phenomenon is possible in : = C 6 5 C = (D) C 3 C = 10. The decreasing order of bond length of C = C bond in the following compounds is: I II III IV II > I > IV > III III > I > II > IV IV > II > I > III (D) IV > I > II > III 11. Which one of the following compounds maximum electron density on aromatic ring : (D) 12. Which of the following statements is true about this molecule. C1-C2 and C3-C4 bonds are of same length. C1-C2 bond is shorter than C3-C4 bond. C1-C2 bond is longer than C3-C4 bond. (D) C1-C2 and C2-C3 bonds are of same length. rganic Chemistry By Page o. # 4
5 DPP o Which of the following statements is true about this molecule? C5- bond is longer than C1- and C3- bonds. C5- bond is shorter than C1- bond and latter is shorter than C3- bond. All three C- bonds are of same length. (D) C1- and C3- bonds are of same length but they are longer than C5- bond. a b c 2. Which of the C C single bond is strongest in 3C C C C C C3 : a b c (D) All equal 3. Predict the relative bond lengths a and b, in napthalene a b a > b a < b a = b (D) one of these 4. The C bond lengths in the following three compounds is : C 3 C3 C C3 C (I) (II) (III) I > II > III I > III > II I > II = III (D) all equal 5. In which of the following molecules electron density in ring is minimum : (D) 6. In which of the following molecules electron density in ring is maximum : (D) 7. Which has the most aromatic nature? (D) All having same aromatic character rganic Chemistry By Page o. # 5
6 8. Which of the following is aromatic species? (-) (D) All 9. Which of the following is anti-aromatic species? (D) S 10. Which is the most aromatic in character? S (D) All having same aromatic character 11. Which is the most aromatic in character? S (D) 12. Identify the aromatic compound? (D) ASWER KEY DPP o (D) (D) 12. DPP o (D) (D) 8. (D) 9. (D) DPP o (D) (D) (D) 9. (D) (D) 12. rganic Chemistry By Page o. # 6
7 Topic - GC (a) UCLE CEMISTRY CLASSES FR IIT-JEE 1. Draw all possible R.S. for each of the following DPP rganic Chemistry Target IIT-JEE 2016 Class -XIII DATE : 10/08/2015 DPP - 4,5 R.. (b) R.. (c) R.. (d) ; R.. (e) ; R.. (f) R.. rganic Chemistry By
8 (g) ; R.. (h) R.. (i) R.. (j) ; R.. (k) ; R.. (l) R.. (m) R.. (n) ; R.. rganic Chemistry By
9 DPP # 5 Q. Mark each of the following as aromatic / Anti Aromatic or on- Aromatic compound and also mention the no. of electons in each : 20. Ṇ. 21. rganic Chemistry By
10 Answer key DPP # 9 1. A(2) 2. A(2) 3. A (6) AA (4) 6. A (6) 7. A (6) 8.A (10) 9. A (6) 10. A(6) 11. AA (8) 12.A (6) 13. A (6) 14. A(6) 15. A(6) 16. A (6) 17. A (6) 18. A (6) 19. A (6) 20. A (6) 21. A (10) on planar 22. A (14) 23. A (6) 24. A (6) 25. A ( 6) 26. A(6) 27. A (6) 28. AA(4) 29.AA (4) 30. A (2), (6) isolated 31. A (6) (6) isolated 32. a 33. A (10) 34. A (14) 35. A (14) 36. A (14) peripheral aromaticity rganic Chemistry By
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DO NOT OPEN UNTIL INSTRUCTED TO DO SO. CHEM 110 Dr. McCorkle Exam #5. While you wait, please complete the following information:
DO NOT OPEN UNTIL INSTRUCTED TO DO SO CHEM 110 Dr. McCorkle Exam #5 While you wait, please complete the following information: Name: Student ID: Turn off cellphones and stow them away. No headphones, mp3
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DO NOT OPEN UNTIL INSTRUCTED TO DO SO. CHEM 110 Dr. McCorkle Exam #5 KEY. While you wait, please complete the following information:
DO NOT OPEN UNTIL INSTRUCTED TO DO SO CHEM 110 Dr. McCorkle Exam #5 KEY While you wait, please complete the following information: Name: Student ID: Turn off cellphones and stow them away. No headphones,
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