www.usefuldesk.com Tamilnadu SSLC Science Lesson 11 – One Marks Choose the correct answer: 1. The molecular formula of an open chain organic compound is C3H6. The class of the compound is Alkane Alkene Alkyne Alcohol 2. The IUPAC name of an organic compound is 3 – Methyl butan – 1 – ol. What type compound it is? Aldehyde Carboxylic acid Ketone Alcohol 3. The secondary suffix used in IUPAC nomenclature of an aldehyde is -ol oic acid -al -one 4. Which of the following pairs can be the successive members of a homologous series? C3H8 and C4H10 C2H2 and C2H4 CH4 and C3H6 C2H5OH and C4H8OH 5. C2H5OH + 3O2 -> 2CO2 + 3H2O is a Reduction of ethanol Combustion of ethanol Oxidation of ethanoic acid Oxidation of ethanol 6. Rectified spirit is an aqueous solution which contains about _________ of ethanol. 95.5 % Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com 75.5 % 55.5 % 45.5 % 7. Which of the following are used as anaesthetics? Carboxylic acids Ethers Esters Aldehydes 8. TFM in soap represents _______ content in soap. Mineral Vitamin Fatty acid Carbohydrate 9. Which of the following statements is wrong about detergents? It is a sodium salt of long chain fatty acids. It is sodium salts of sulphonic acids The ionic part in a detergent is –SO3 –Na+ It is effective even in hard water. Fill in the blanks: 1. An atom or a group of atoms which is responsible for chemical characteristics of an organic compound is called _______ Functional group 2. The general molecular formula of alkynes is ______ CnH2n-2 3. In IUPAC name, the carbon skeleton of a compound is represented by ________ (root word / prefix / suffix) Root Word 4. (Saturated / Unsaturated) ________ compounds decolourize bromine water. Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com Unsaturated 5. Dehydration of ethanol by conc sulphuric acid forms ______ (ethane / ethane) Ethene 6. 100 % pure ethanol is called ________ Absolute alcohol 7. Ethanoic acid turns _________ litmus to _________ Blue, red 8. The alkaline hydrolysis of fatty acids is termed as ______ Saponification 9. Biodegradable detergents are made of _______ (branched/straight) chain hydrocarbons. Straight Match the following: Column – I Column – II Answers Functional group –OH Benzene Alcohol Heterocyclic Potassium stearate Furan Unsaturated Alcohol Ethene Soap Furan Potassium stearate Carbocyclic Ethene Benzene Additional One Word: 1. Organic compound have a ________ structure. Complex 2. Organic compounds are ______ reactive when compared to inorganic compounds. Less Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com 3. Most of the organic compound form ______ bonds. Covalent 4. Organic compound have ________ melting point when compared to inorganic compounds. Lower 5. Acyclic compounds are also called ______ Open chain compounds 6. The compound is called ________ when one or more double or triple bonds exist between carbon atoms. Unsaturated 7. CH3 – CH = CH2, is a/an ______ carbon compound. Unsaturated 8. Cyclic carbon compounds which contain only carbon atoms are called _______ Carbocyclic 9. __________ rings contain alternate double lands between carbon atoms. Benzene 10. __________ compounds are also called closed chain compounds. Cyclic 11. Organic chemistry is the chemistry of ________ carbon compounds. Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com Catenated 12. If all the carbon atoms in the chain are connected by single bonds, the compound is called as _______ Saturated 13. Organic compounds in which the chain of carbon atoms is closed or cyclic are called _________ compounds Cyclic 14. Carbocyclic compounds are further subdivided into _______ and _______ compounds. Alicyclic, aromatic 15. Alicyclic compounds contain one or more _____ rings. Carbocyclic 16. Aromatic compounds contain one or more ______ rings. Benzene 17. The carbon atoms in organic compounds are linked through ______ bonds. Covalent 18. Ethane is an example of a/an _____ carbon compound. Saturated 19. Ethyne CH = CH, is an example of a/an ______ carbon compound. Unsaturated Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com 20. The general formula for Alkynes is ________ CnH2n-2 21. The organic compounds that are composed of only carbon and hydrogen atoms are called Hydrocarbons 22. ____________ are hydrocarbons, which contain only single bonds. Alkanes 23. Hydrocarbons which contain one or more C= C bonds are called ________ Alkenes 24. Hydrocarbons containing carbon to carbon triple bond are called _________ Alkynes 25. ___________ is the simplest alkyne. Acetylene 26. The general formula of alkanes is _________ CnH2n+2 27. __________ is the simplest alkane. Methane 28. The general formula for alkenes is __________ is the simplest alkene. CnH2n Ethylene Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com 29. Lower hydrocarbons are ________ at room temperature. Gases 30. The boiling point of hydrocarbons increases with the number of _________ atoms. Carbon 31. _________ are least reactive when compared to other classes of hydrocarbons. Alkanes 32. __________ are saturated hydrocarbons. Alkanes 33. Alkenes and Alkynes are _______ hydrocarbons. Alkenes 34. A __________ group is an atom or group of atoms in a molecule, which gives its characteristic chemical properties. Functional 35. The chemical properties of an organic compound depend on its ______ group. Functional 36. A series of compounds containing the same functional group is called a ________ Compounds. Class of organic 37. Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com ________ is a group or a class of organic compounds having same general formula and similar chemical properties. Homologous series 38. Each member of the homologous series differ from the preceding or succeeding member by one ________ group. Methylene 39. Each member of the homologous series differ from the preceding or succeeding member by a molecular mass of ______ 14 amu 40. All members of a homologous series contain the ________ elements. Same 41. The members of the homologous series are represented by a general molecular formula _______ CnH2n+2 42. The members in each homologous series show a regular gradation in physical properties with an increase in ________ Molecular mass 43. ___________ properties of the members of a homologous series are similar. Chemical 44. Homologous series differ by a _________ group. CH2 Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com 45. The __________ acid was initially obtained by distillation of red ants. Formic 46. The root words for the parent chain of hydrocarbons containing 1 carbon atom is __________ Meth- 47. The root words for the parent chain of hydrocarbons containing 6 carbon atom is _______ Hex- 48. The root words for the parent chain of hydrocarbons containing 9 carbon atom is _____ Non- 49. Prefix + _________ + Suffix -> IUPAC name. Root Word 50. A __________ is the basic unit which described the carbon selection. Root Word 51. The prefix used for IUPAC substituent –F is ______ Fluoro 52. The prefix used for IUPAC substituent –NH2 is ______ Amino 53. The prefix used for IUPAC substituent –CH2CH3 is __________ Ethyl Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com 54. The ___________ suffix comes after the root world. Primary 55. If all the bonds between the carbon atoms of the parent chain are single, then suffix _______ is used. Ane 56. The secondary suffix describes the ________ group of the compound. Functional 57. The suffix used for class of the compound aldehydes is ________ -al 58. The suffix used for class of the compound ketones is ______ -one 59. Ethanol is commonly known as ______ Alcohol 60. All alcoholic beverages and some cough syrups contain ______ Ethanol 61. The molecular formula of ethanol is _________ C2H5OH 62. Ethanol is manufactured by the fermentation of ________ Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com Molasses 63. ____________ is a dark coloured syrupy liquid left after the crystallization of sugar from the concentrated sugarcane juice. Molasses 64. If the nitrogen content of the molasses is poor, it may be fortified by the addition of __________ or _______ Ammonium sulphate, ammonium phosphate 65. The fermented liquid during the formation of ethanol is called ______ Wash 66. The fermented liquid in the formation of ethanol contains 15 to 18 % of ______ Alcohol 67. __________ is conversion of complex organic molecules into simpler molecules by the action of enzymes. Fermentation 68. Curding of milk is an example of _________ Fermentation 69. The boiling point of ethanol is ________ degree C. 78 70. When ethanol is heated with con H2SO4 at 443K, it loses a _______ molecule. Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com Water 71. Ethanol reacts with _______ metal to form sodium ethoxide and hydrogen gas. Sodium 72. _________ is used in medical wipes, as an antiseptic. Ethanol 73. Ethanol is used as an _______ in automobile radiators. Anti – freeze 74. Methylated spirit is a mixture of 95% of _______ and 5% of ________ Ethanol, methanol 75. Rectified spirit is mixture of ________ of ethanol and _____ of water. 95.5 %, 4.5 % 76. Power alcohol is a mixture of _________ and ethanol. Petrol 77. Denatured spirit is ethanol mixed with _______ Pyridine 78. Ethanoic acid is also called as __________ acid. Acetic 79. The molecular formula of ethanoic acid is _________ Website: www.usefuldesk.comFacebook: www.facebook.com/usefuldeskE-mail: [email protected] www.usefuldesk.com C2H4O2 80. On cooling, pure ethanoic acid is _______ to form ice like flakes.