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ORGANIC CHEMISTRY

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CHEMISTRY Chapter 8 : Organic Chemistry SECTION I Question I A. Choose the correct answer from the options given below: 1. The IUPAC name of acetylene is : i. Propane ii. Propyne iii. Ethene iv. Ethyne Ans. Ethyne 2. The functional group present in acetic acid is : i. ketonic ii. hydroxyl iii. aldehydic iv. carboxyl Ans. carboxyl 3. The unsaturated hydrocarbons undergo: i. a substitution reaction ii. an oxidation reaction iii. an addition reaction iv. none of the above Ans. an addition reaction 4. The number of C-H bonds in ethane molecule are: i. four ii. six iii. eight iv. ten Ans. Six 5. Treating sodium acetate with soda lime produces: i. Methane ii. Ethane iii. Propane iv. Butane Ans. Methane 6. An organic weak acid is: i. Formic acid ii. Sulphuric acid iii. Nitric acid iv. Hydrochloric acid Ans. Formic acid 7. The organic compound mixed with ethanol to make it spurious is: i. Methanol ii. Methanal iii. Methanoic acid iv. Ethanoic acid Ans. Methanol 8. Which of the following statements is wrong about alkanes: i. They are all saturated hydrocarbons. Ii. They can undergo addition as well as substitution reactions. iii. They are almost non polar in nature. iv. On complete combustion, give out carbon dioxide and water. Ans. They can undergo addition as well as substitution reactions. 9. Select the acid which contains four hydrogen atoms in it: i. Formic acid ii. Sulphuric acid iii. Nitric acid iv. Acetic acid Ans. Acetic acid 10. The organic compound obtained as the end product of the fermentation of sugar solution is: i. Methanol ii. Ethanol iii. Ethane iv. Methanoic acid Ans. Ethanol 11. The formation of 1,2-dibromo ethane from ethene and bromine is an example of: i. Substitution ii. Dehydration iii. Dehydrohalogenation iv. Addition Ans. Addition 12. The property of carbon to form long chains and rings is called ___ i. Catenation ii. Polymerization iii. Cracking iv. Hydrogenation Ans. Catenation 13. In which of the following compounds , - OH is the functional group? i. Butanone ii. Butoic acid iii. Butanol iv. Butanal Ans. Butanol 14. Pentane has a molecular formula C5H12. It has ________. i. 8 covalent bonds ii. 10 covalent bonds iii. 16 covalent bonds iv. 14 covalent bonds Ans. 16 covalent bonds 15. Which organic acid is used for coagulating rubber from latex? i. Acetic acid ii. Oxalic acid iii. Citric acid iv. Malic acid Ans. Acetic acid. 16. Which of the following does not belong to same homologous series. i. CH4 ii. C2H6 iii. C3H8 iv. C3H6 Ans. C3H6 17. Two neighbours of a homologous series differ by i. CH ii. CH2 iii. CH3 iv. CH4 Ans. CH2 18. Complete combustion of hydrocarbon produces i. CO + H2O ii. CO + H2 iii. CO2 + H2 iv. CO2 + H2O Ans. CO2 + H2O 19. The pair of compounds representing isomers is i. Methane & Ethane ii. Ethane & Propane iii. 1 Butene & 2 Butene iv. Propene & Butene Ans. 1 Butene & 2 Butene B. Fill in the blanks from the options given in the brackets: 1. The compound formed when ethanol reacts with sodium is _____ ( sodium ethanoate, sodium ethoxide, sodium propanoate) Ans. sodium ethoxide 2. When acetic acid reacts with sodium, it liberates ____ (hydrogen, oxygen, nitrogen) Ans. hydrogen 3. ________ has a triple bond. (C2H4 , C3H4 ,C3H6) Ans. C3H4 4. Alkenes are homologous series of _____ (saturated/unsaturated) hydrocarbons. Ans unsaturated 5. The conversion of ethanol to ethene is an example of _______ (dehydration/dehydrogenation) Ans. dehydration C. Distinguish between the following pairs of compounds using chemical tests: 1. Ethene gas and ethane gas Ans. Using Bromine solution in carbon tetrachloride Test Ethene Ethane On adding few drops of bromine solution in Carbon tetrachloride to hydrocarbon. The reddish brown colour of bromine solution gets decolourised. No change observed. D. Give one word or phrase for the following: 1. A compound which is heated with sodalime to obtain ethane gas in the laboratory. Ans. Sodium Propionate. 2. An anhydrous substance on cooling forms a crystalline mass resembling ice. Ans. Glacial acetic acid. 3. Organic compouds, composed of carbon and hydrogen only Ans. Hydrocarbons. 4. An atom, radical or bond which defines the structure of organic compound and confers characteristic properties to it Ans. Functional group. 5. The phenomenon possessed by the organic compound having same molecular formula but different properties Ans. Isomerism. E . Give reasons: 1. Why almost 90% of all known compounds are organic in nature? Ans: 1. 90% of all known compounds contain carbon and hydrogen. 2. They are obtained from or are present in the plants and animals. Q2. Why is it dangerous to burn methane in an insufficient supply of air. Ans: 1. It will lead to incomplete oxidation. 2. It will form carbon monoxide which is poisonous in nature. Q 3. Methane does not undergo addition reaction but ethene does. Ans: 1. Methane is a saturated hydrocarbon while ethene is an unsaturated hydrocarbons. 2. Addition reaction is a characteristic property of unsaturated hydrocarbons. Q4. Ethyne is more reactive than ethane. Ans: 1. Ethyne is an unsaturated hydrocarbon with a triple covalent bond. 2. Ethane is a saturated hydrocarbon and hence is less reactive. Q5. Hydrocarbons are excellent fuels. Ans: 1. Hydrocarbons ignite easily at low temperature. 2. They liberate a large amount of heat without producing harmful products.

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