NOMENCLATURE OF ORGANIC COMPOUND Exercise # 5 1. 2. Part # I [Previous Year Questions] Which one of the following does not have sp2 hybridised carbon? (1) Acetone (2) Acetic acid (3) Acetonitrile The IUPAC name of the compound (4) Acetamide is HO (1) 1, 1-dimethyl-3-cyclohexanol (3) 3, 3-dimethyl-1-cyclohexanol 3. (2) 1, 1-dimethyl-3-hydroxy cyclohexane (4) 3, 3-dimethyl-1-hydroxy cyclohexane The IUPAC name of the compound is Cl Br (1) 6-bromo-2chlorocyclohexene (3) 1-bromo-3-chlorocyclohexene 4. The IUPAC name of (2) 3-bromo-1-chlorocyclohexene (4) 2-bromo-6-chlorocyclohex-1-en is (1) 1, 1-diethyl-2, 2-dimethylpentane (3) 5, 5-diethyl-4, 4-dimethylpentane 5. 6. (2) 4, 4-dimethyl-5, 5-diethylpentane (4) 3-ethyl-4, 4-dimethylpentane The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is (1) –COOH, –SO3H, –CONH2, –CHO (2) –SO3H, –COOH, –CONH2, –CHO (3) –CHO, –COOH, –SO3H, –CONH2 (4) –CONH2, –CHO, –SO3H, –COOH The IUPAC name of neopentane is : (1) 2-methylpropane (2) 2, 2-dimethylbutane (3) 2-methylbutane (4) 2, 2-dimethylpropane O 7. The IUPAC name of compound H2C CH CH3 is :- (1) 1, 2-Epoxy propane (3) 1, 2-Oxo propane 8. 9. (2) Propylene oxide (4) 1, 2-Propoxide The IUPAC name of the followig compounds is : (1) (Z) – 5– hepten – 3 – yne (3) (E) – 5– hepten – 3 – yne (2) (Z) – 2– hepten – 4 – yne (4) (E) – 2– hepten – 4 – yne Aspirin is known as : (1) Acetyl salicyclic acid (3) Acetyl salicylate (2) Phenyl salicylate (4) Methyl salicylic acid [Previous Year Questions] Part # II 1. Write IUPAC name of the following COOH NH2 O C Cl 2. IUPAC name of C6H5 (A) Benzoylchloride (B) Benzenecarbonylchloride (C) Chlorophenyl ketone (D) Phenylchloroketone 3. Write IUPAC name of the following SO3H CH3 4. 5. The number of structural isomers for C6H14 is : (A) 3 (C) 5 (B) 4 (D) 6 The IUPAC name of the following compound is : OH CN Br (A) 4-Bromo-3-cyanophenol (B) 2-Bromo-5-hydroxybenzonitrile (C) 2-Cyano-4-hydroxybromobenzene (D) 6-Bromo-3-hydroxybenzonitrile 6. The total number of cyclic isomers possible for a hydrocarbon with the molecular formula C4H6 is/are : 7. In allene (C3H4), the type(s) of hybridisatin of the carbon atoms is (are) : (A) sp and sp3 (B) sp and sp2 3 (C) only sp (D) sp2 and sp3 NOMENCLATURE OF ORGANIC COMPOUND 8. The carboxyl function group (–COOH) is present in : (A) picric acid (B) barbituric acid (C) ascorbic acid (D) aspirin 9. The IUPAC name(s) of the following compound is(are) H3C Cl (A) 4-methylchlorobenzene (B) 4-chlorotoluene (C) 1-chloro-4-methylbenzene (D) 1-methyl-4-chlorobenzene EXERCISE - 5 : PART # I 1. 3 2. 3 3. 2 4. 4 5. 1 6. 4 7. 1 8. 4 9. 1 PART # II 1. 3-Aminobenzoic acid 2. B 3. 4-Methylbenzensulphonic acid 4. 6. B 8. D 5 7. 9. B, C C 5. B