Carbon and its compounds worksheet



GradeX CARBON AND ITS COMPOUNDS WORKSHEET“Carbon does not form C4- ion”-Give reason in support of the statement . Name any one molecule and one compound which has a triple bond . Give the IUPAC name of the following compound. CH3 │ CH3─ CH─CH─CH3 │ CH3 4)If n =2 .write the name and molecular formula of the compound formed in alcohol and aldehyde series . 5)Name the process used to convert ethanol to ethanoic acid and write the chemical equation . 6)Which type of hydrocarbons burn with a sooty flame ? Why? 7)State any four characteristics of homologous series . Give the molecular formula of the third member of the homologous series of carboxylic acid and alkyne 8)a) Write the names of the functional groups in; i) R ii) R C═O C═O R H b)Write a chemical equation to represent what happens when hydrogen gas is passed through unsaturated hydrocarbon in the presence of nickel catalyst . c)Write a chemical equation to show burning of ethanol in air .9) Answer the following i)An organic compound “X” molecular formula C2H6O reacts with sodium metal to form a compound “R “and a colourlessgas “Y” . Identify R and Y and write the chemical equation involved . ii) Name any two isomers of C5H12.10)Look at the figure and answer the questions that follow- i)Identify the gas A .what happens to calcium hydroxide when the gas A is passed through it ii) Name the functional group present in C2H4O2-iii)Write chemical equation for the reaction of C2H4O2 with sodium bi carbonate .iv)Give one property of C2H4O2 which is different from ethanol.v)The compound C2H4O2 reacts with ethanol in the presence of sulphuric acid ,write the chemical equation involved. 11) Answer the following selecting the correct option. (1X5)a)A large number of carbon compounds are formed due to the following properties of carboni) Allotropy and Tetravalencyii) Covalency and Allotropyiii) Tetravalency and catenationiv) Oxidation and combustibilityb) A mixture of ethanoic acid and water was found to be ;i) Transparent and homogeneousii) Translucent and homogeneousiii) Turbid and homogeneousiv) Translucent and heterogeneousc) A blue litmus paper was first dipped in ethanol and then in ethanoic acid , the colour changes observed were; i) first red and then again blueii) first it remained blue and then changed to rediii) first red and then it remained rediv) No change was seen in either wayd)A mixture of an alcohol and a carboxylic acid was taken in a test tube .Few drops of sulphuric acid were added and warmed .The smell detected was;i) suffocating ii) pungentiii) fruityiv) smell of rotten eggse)A universal indicator paper was dipped in a solution of propanoic acid inwater .The colour of the paper changed to;i)light blueii) reddishiii) dark blueiv) greenQt No: Expected Answer / Value Points Marks1Carbon cannot gain 4 electrons and form C4- ion because six protons cannot hold 10 electrons and there will be strong interelectronic repulsion 12Nitrogen and Ethyne ?+ ? 32,3 diMethyl Butane 14Ethanol C2H5OH and Propanal C2H5CHO?X4 =2 5Oxidation 2C2H5OH + [O]-----alk KMnO4-------------2CH3COOH + H2O1+16Unsaturated hydrocarbons burn with a sooty flame .This is because of higher percentage of carbon in them is higher comparatively to saturated hydrocarbons All carbon does not get oxidized .Incomplete combustion takes place and soot is formed 1+17Four points -1) All homologoues of a particular series have same chemical properties 2)each successive member differs by a CH2 group3) All the members of a particular series have same general formula4)The members of a particular series show a gradual change in physical properties Carboxylic acid –propanoic acid acid – Alkyne –butyne 2 +18a)Ketone , Aldehyde b)When hydrogen gas is passed through an unsaturated hydrocarbon in the presence of nickel at 474K it forms a saturated hydrocarbon –this is addition reaction .C2H4 +H2 ----------- Ni ---------- C2H6c) When ethanol burns in air it forms carbondioxide and water vapour as well as heat 2C2H5OH + 3O2-------2CO2 + 3H2O + heat 1x3 =39 a)R = sodium ethoxide Y =hydrogen gas2C2H5OH + 2Na-----2C2H5O Na + H2b) any two1+1=2110Gas A =carbondioxide .It turns lime water milkyCarboxylic acid CH3COOH + NaHCO3 ---CH3COONa + CO2 +H2OTurns blue litmus red (any other )CH3COOH + C2H5OH -----conc H2SO4---------CH3COO C2H5 1X5=5MCQa)iii b) i c)ii d)iii e) ii ................
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