Tiêu đề 12. Organic Chemistry – Some Basic Principles and Techniques.pdf ✅

FACT/DEFINITION TYPE QUESTIONS 1. Which of the following scientist proposed that a ‘vital force’ was responsible for the formation of organic compounds ? (a) Berzilius (b) Wohler (c) Berthelot (d) Kolbe 2. First organic compound to be synthesised was (a) methane (b) cane sugar (c) acetic acid (d) urea 3. Which of the following organic compound was synthesised by F. Wohler from an inorganic compound? (a) Methane (b) Urea (c) Acetic acid (d) Chloroform 4. The discovery that shook the belief in the vital force theory was (a) Stereoisomerism (b) Synthesis of indigo (c) Wholer’s synthesis of urea from ammonium cyanate (d) Fermentation of sugars 5. In laboratory, first organic compound was synthesised by (a) Kekule (b) Hennel (c) Wohler (d) Liebig 6. Who is known as the “Father of Chemistry”? (a) Faraday (b) Priestley (c) Rutherford (d) Lavoisier 7. The hybridisation of carbon atom in C — C single bond of H2C = CH — CH = CH2 is (a) sp3 — sp (b) sp2 — sp (c) sp2 — sp2 (b) sp3 — sp3 8. In the hydrocarbon CH – CH = CH – CH – C CH 3 2 { 6 5 4 3 2 1 ORGANIC CHEMISTRY–SOME BASIC PRINCIPLES & TECHNIQUES 12 The state of hybrization of carbons 1, 3 and 5 are in the following sequence (a) sp2 , sp, sp3 (b) sp, sp3 , sp2 (c) sp, sp2 , sp3 (d) sp3 , sp2 , sp 9. The percentage of s- character of the hybrid orbitals in ethane, ethene and ethyne are respectively. (a) 50, 75, 100 (b) 10, 20, 40 (c) 25, 33, 50 (d) 25, 50, 75 10. Select the molecule which has only one S-bond (a) CH { CH (b) CH2 = CHCHO (c) CH3CH = CH2 (d) CH3CH=CHCOOH 11. 2- Pentene contains (a) 15 V- and one S- bond (b) 14 V-and one S- bond (c) 15 V- and two S- bonds(d) 14 V- and two S- bonds 12. Which of the following does not represent the 2 – bromo pentane ? (i) H H H H H H Br H H H H C C CCC (ii) Br (iii) Br (iv) Br (v) CH3 CH2 CH2 CHBrCH3 (a) (ii), (iii) and (v) (b) Only (ii) (c) (ii) and (iii) (d) (iii) and (v)
182 ORGANIC CHEMISTRY – SOME BASIC PRINCIPLES & TECHNIQUES 13. Which of the following correctly represents the expanded form of following organic compound ? (a) H H C C C C H H H C C H H H H H (b) H C C C C H H C C H H (c) H C C C C H H H C C H H H H H H H H H (d) H H H H C C C C H C C H H H H H 14. Structural formula of benzene is (a) H H H C C C C C C H H (b) C C H H C C H H H H H H H H C C H H (c) C C C C C C H H H H H H (d) C C C C H H H H C C H H H H 15. The successive members in a homologues series differ from each other by ________ (a) – CH2 CH2 – unit (b) – CH2 unit (c) – OCH3 unit (d) – CH3 unit 16. Which of the following have incorrect molecular formula? A. Icosane – C10H22 B. Triacontane – C30H62 C. Nonane – C9H20 D. Heptane – C7H14 (a) (A) and (D) (b) Only (D) (c) (B) and (D) (d) Only (B) 17. Which of the following are incorrect methods of selecting parent chain ? (i) 3 222 223 3 2 3 1 23 4 5 6 CH CH CH CH CH CH CH CH CH | | CH 7CH CH 8 (ii) 3 222 223 3 72 3 8 1 23 4 5 6 CH CH CH CH CH CH CH CH CH | | CH CH CH (iii) 3 222 223 3 2 3 1 23 4 5 67 8 9 CH CH CH CH CH CH CH CH CH | | CH CH CH (iv) 3 222 223 3 2 3 8 76 5 4 3 CH CH CH CH CH CH CH CH CH | | CH CH CH 12 (a) (i) and (ii) (b) (iv) only (c) (i), (ii) and (iv) (d) (ii) only 18. The correct decreasing order of priority of functional groups is (a) – SO3H , – OH, – COCl, C = C (b) – COOH, – SO3H, – COOR, – OH (c) – C { C, – NH2 , – OH, C = O (d) – CN, – CONH2 , C = O, – OH 19. Which of the following is incorrectly matched – (a) vinegar ocarboxylic acid (b) C2H6 oalkane (c) ethanol oalcohol (d) methanol oketone 20. The functional group present in organic, acid is – (a) – OH (b) – CHO (c) –COOH (d) > C = O 21. Which of these contains the carbonyl group? (a) ketones (b) aldehydes (c) esters (d) all of these 22. Butanone is a four-carbon compound with the functional group – (a) carboxylic acid (b) aldehyde. (c) ketone (d) alcohol. 23. The functional group present in CH3COOC2H5 is – (a) ketonic (b) aldehydic (c) ester (d) carboxylic 24. Which of the following compounds contains 1°, 2°, 3° as well as 4° carbon atoms ? (a) Neopentane (b) 2-methyl pentane (c) 2,3-dimethyl butane (d) 2,2,3-trimethyl pentane 25. The number of secondary hydrogens in 2, 2-dimethylbutane is (a) 8 (b) 6 (c) 4 (d) 2 26. The compound which has one isopropyl group is (a) 2, 2, 3, 3 - Tetramethylpentane (b) 2, 2 - Dimethylpentane (c) 2, 2, 3- Trimethylpentane (d) 2- Methypentane 27. Which of the following statements is false for isopentane ? (a) It has three CH3 groups (b) It has one CH2 group (c) It has one CH group (d) It has a carbon which is not bonded to hydrogen EduHulk ORGANIC CHEMISTRY – SOME BASIC PRINCIPLES & TECHNIQUES
ORGANIC CHEMISTRY – SOME BASIC PRINCIPLES & TECHNIQUES 183 28. The number of primary, secondary and tertiary carbons in 3, 4-dimethylheptane are respectively (a) 4, 3 and 2 (b) 2, 3 and 4 (c) 4, 2 and 3 (d) 3, 4 and 2 29. The number of primary, secondary, tertiary and quaternary carbons in neopentane are respectively (a) 4, 3, 2 and 1 (b) 5, 0, 0 and 1 (c) 4, 0, 0 and 1 (d) 4, 0, 1 and 1 30. What is the IUPAC name of t-butyl alcohol. (a) Butanol–2 (b) 2–Methyl-propan–2-ol (c) Butanol–1 (d) Propanol-2 31. The IUPAC name of CH3COCH (CH3 ) 2 is - (a) isopropyl methyl ketone (b) 2-methyl-3-butanone (c) 4-methylisopropyl ketone (d) 3-methyl-2-butanone 32. CH3CH2 – 2 3 3 CH CH – CH CH | | CH CHO has the IUPAC name – (a) 2–sec butylbutanal (b) 2, 3–diethylbutanal (c) 2–ethyl–3–methylpentanal (d) 3–methyl–2–ethylpentanal 33. Which of the following statements is false for isopentane– (a) It has three CH3 groups (b) It has one CH2 group (c) It has one CH group (d) It has a carbon which is not bonded to hydrogen 34. The IUPAC name of the compound CH3OCH2CH2CH2OCH2CH3 is (a) 3-ethoxy-1-methoxypropane (b) 1-ethoxy-3-methoxypropane (c) 2, 5-dioxyhexane (d) ethoxypropane oxymethane 35. Which of the following compounds has wrong IUPAC name? (a) CH3 –CH2 –CH2 –COO–CH2CH3 o ethyl butanoate (b) CH CH CH CHO 3 2 | CH3 o 3-methyl-butanal (c) CH CH C 3 H CH3 | | OH CH3 o 2-methyl-3-butanol (d) O || CH CH C CH CH 3 23 | CH3 o 2-methyl-3-pentanone 36. The IUPAC name of the compound shown below is Br Cl (a) 3-bromo-1-chlorocyclohexene (b) 1-bromo-3-chlorocyclohexene (c) 2-bromo-6-chlorocyclohex-1-ene (d) 6-bromo-2-chlorocyclohexene 37. Name of the following compound is OH C CH3CH2 CH3CH2 CH3 (a) 2-ethylbutan-2-ol (b) 1-ethyl-1-methylpropan-1-ol (c) 3-methyl pentan-3-ol (d) diethylethanol 38. The IUPAC name for 32 3 C1 | CH C CH CH CH CH | H is (a) 5–chlorohex–2–ene (b) 2–chlorohex–5–ene (c) 1–chloro–1–methylpent–3–ene (d) 5–chloro–5–methylpent–2–ene 39. IUPAC name of following compound is : CH3 CH - C - CH - CH 3 2 H CH2 - CH3 (a) 2 - cyclohexylbutane (b) 2 - phenylbutane (c) 3 - cyclohexylbutane (d) 3 - phenylbutane 40. What is the IUPAC name of the following compound ? NH2 (a) 2-methyl-4-hexanamine (b) 5-methyl-3-hexanamine (c) 2-methyl-4-amino hexane (d) 5-methyl-3-amino hexane 41. Which one of the following is ethyl-4-(dimethyl amino) butanoate ? (a) 2 (MeNH) OEt (b) OEt NH2 (c) OEt H2N (d) Me2N OEt EduHulk ORGANIC CHEMISTRY – SOME BASIC PRINCIPLES & TECHNIQUES