(b) (i) Chloromethane – CH3Cl (a) What is element A ? A colourless organic liquid X of molecular formula C2H402 turns blue litmus to red. (a) Sodium metal test: Add a small piece of sodium metal to the organic liquid (to be tested), taken in a dry test tube. Solution : 4. Draw a simple diagram to show the arrangement of carbon atoms in diamond. C2H5OH and CH3COOH react in the presence of conc. Question 68: Ethanol (C2H5OH), Question 3: Answer. Write its name and structural formula. Ethane. It is made up of carbon. Write the formula of the acid and the alcohol from which it is formed. (b) A diamond crystal is a giant molecule of carbon atoms. Name two catalysts which can be used in the hydrogenation of unsaturated compounds. (b) Write the names and structural formulae of all the possible isomers of hexane. (b) Fuels which do not vaporise on heating, burn without a flame. Give an example (with equation) of an addition reaction of an alkene. Solution : Question 30: Give equation of the reaction which takes place. (a) Match the formulae in group A with appropriate names from group B : Solution : Question 42: C4H10; C5H8; C5H10 Write down (i) structural formula, and (ii) electron-dot formula, of any one isomer of hexane (C6H14), other than n-hexane. (d) Select the hydrocarbons which belong to the same homologous series. Solution : Question 36: (a) What would be observed on adding a 5% alkaline potassium permanganate solution drop by drop to (b) Give the molecular formula of butane and mention the names of its two isomers. Solution : Question 14: Give the IUPAC name of the following compound : C 2 H 6 Solution : Ethane. (c) Allotrope C: Diamond View Answer. (c) Name the functional groups present in the following compounds : (b) Name the allotrope Y. (f) Name a yet another allotrope of element A which conducts electricity. (i) Catenation Only valence electrons. Solution : Write the electron dot structure of ethane molecule, C2H6. Finally, lewis dot structure of ethane can also be written in similar way. What is the difference between two consecutive homologues : Write the electron-dot structures for : (i) ethane, (ii) ethene, and (iii) ethyne. (a) CH3COOH is a c arboxylic acid. (a) How would you test for an alcohol ? (b) Carbon forms covalent bonds because it can achieve the inert gas electron Solution : (a) Which compound is most likely to be sweet-smelling ? Solution : Give one characteristic chemical property of each. (a) Activity: (a) Element A: Carbon (b) Why are coal and petroleum called fossil fuels ? It has to be remembered that this is not an ion, the atoms are all covalently bonded, the electrical charges show how the charges get polarized in the group. This shows us that hydrochloric acid is a strong acid. Download the PDF Question Papers Free for off line practice and view the Solutions online. (h) Low; covalent (a) Write the name and formula of an organic compound containing a ketone functional group. Solution : (a) Propanol Question 36: (b) What type of chemical bonds are formed by carbon ? Answer: Explanation: 99. (b) Why does carbon form compounds mainly by covalent bonding ? The four surrounding carbon atoms are at the four vertices of a regular tetrahedron. (b) H2S. What does it show ? Group A : CH3COOH, CH3CHO, CH3OH (c) What is compound Z ? (b) when one H atom of C3H8 is replaced by OH group. [Delhi 2011] Answer/Explanation. (d) when one H atom of C3H8 is replaced by a COOH group. Write the IUPAC names of the following : (b) A mixture of ethyne and air is not used for welding because burning of ethyne in air produces a sooty flame (due to incomplete combustion) which is not hot enough to melt metals for welding. Name one fuel which contains both these isomers. (c) Y is a good conductor of electricity. Give the name and structural formula of one homologue of HCOOH. We will observe that brisk effervescence of carbon dioxide gas is produced. Alcohols (c) Why is graphite used for making dry cell electrodes but diamond is not ? Also write its formula. Ethane is one of the alkanes, which and thus it is a saturated carbon compound which means it has all single bonds. (a) Element E: Carbon (a) The process of burning of a hydrocarbon in the presence of air to give CO2, H2O, heat and light is known as……… (i) Propanone Write equation of the reaction involved. (ii) Ethene:- Single bonds: Four; Double bond: One A C4H8O2 A graphite crystal consists of layers of carbon atoms or sheets of carbon atoms. Ethane is formed when hydrogen is added to ethene. (b) propanol into propanoic acid ? C3H4, Question 66: Come from this bond is the compound formation and progressing toward more … First member: Ethyne To which homologous series does it belong ? A yet another colourless organic liquid Z of molecular formula C2H6O has also no action on litmus but it is used in tincture of iodine. ], What would be the electron dot structure of carbon dioxide which has the formula CO. (d) Name the liquid Z. With four single bonds, carbon has a tetrahedral structure, while with one double bond it's structure is trigonal planar, and with a triple bond it has a linear structure. (a) Explain the process of preparation of soap in laboratory. (c) Butanal, CH3-CH2-CH2-CHO (f) Graphite, Question 63: Solution: 17. (c) Write the molecular formula and structure of benzene. (b) What is compound B ? (a) Which compound contains an alcohol group ? (c) Third member: C3H8 (e) when two H atoms joined to the middle carbon atom of C3H8 are replaced by one O atom. (a) Buckminsterfullerene is an allotrope of carbon containing clusters of 60 carbon atoms joined together to form spherical molecules. (c) What is meant by denatured alcohol ? Question 31: Solution : (ii)Diamond is a non-conductor of electricity whereas graphite is a good conductor of electricity. (b)(i) Dilute ethanoic acid (in the form of vinegar) is used as a food preservative in the preparation of pickles and sauces. (d) -OH (alcohol) (i) It is used in the manufacture of paints, varnishes, lacquers, medicines, perfumes, dyes, soaps and synthetic rubber. Solution : Example: Chlorine (Cl), Bromine (Br), Oxygen (O) (a) What is compound A ? Solution : (e) What is the general name of compounds like Z ? (i) 14 u (c)Diamond, graphite and buckminsterfullerene. Explain with an example. (d) CH3OH; Methanol Can you tell why a mixture of ethyne and air is not used ? Which of the following molecule is called buckminsterfullerene ? asked Aug 14, 2019 in Class X Science by navnit40 ( -4,939 points) Question 25: (a) The property of self combination of carbon atoms to form long chains is called catenation. (b) What change will you observe if you test soap solution with a litmus paper (red and blue) ? (a) Friedrich Wohler converted an inorganic compound into an organic compound in the laboratory. (a) Ethanoic acid (b) Propanoic acid Solution : (c) Select the hydrocarbons which are members of the same homologous series. (d) Liquid Z is ethanol; it belongs to homologous series of alcohols. Solution : (b) Why is diamond used for making cutting tools (like glass cutters) but graphite is not ? Write the name of another member of this homologous series. Solution : Which of the following hydrocarbons can decolourise bromine water and which cannot ? A hard material X which is mined from the earth is used as a household fuel and also for the generation of electricity at Thermal Power Stations. (c) What is compound B ? An organic compound having the molecular formula C2H60 can exist in the form of two isomers A and B having different functional groups. Solution : Question.27 Draw the structure of butanone molecule, CH 3 COC 2 H 5. Draw the electron dot structure of ethyne and also its struct structural formula brainly in write molecular electronic i) ethane ethene amp electrin for amixture oxygenis burnt. Solution : Question 3: (c) Why have detergents replaced soap as a washing agent ? Formaldehyde, Question 6: Also write its formula,. Fill in the following blanks with suitable words : Name one soap. (a) What is diamond ? (f) Which three formulae can represent cyclic hydrocarbons ? (c) Explain how coal was formed in the earth. (AI 2015) Answer: involved in detail. (i) Alkene group (ii) Alkyne group (c) Propanal; it belongs to homologous series of aldehydes. Litmus test: Some blue litmus solution is added to the organic compound (to be tested). Being acid, it reacts with sodium hydrogencarbonate to produce carbon dioxide gas. (e) C7H14; (a) when one H atom of C3H8 is replaced by a Cl atom. Question 19: (d) Butanoic acid, CH3-CH2-CH2-COOH Question 56: (b) Write the molecular formula and structure of cyclohexane. Molecular formula: C8H16, Question 67: Solution : (e) Esters Solution : Question 11: (b) What is allotrope A ? (b) What is added to groundnut oil when it is to be converted to vanaspati ghee ? Methanol, Question 4: The complete ethane chemical formula and its structural formula are given in the following points. (a) Write the chemical equation of the reaction which takes place during the burning of ethanol in air. (a) Giving their structures, state the number of single bonds, double bonds and triple bonds (if any) in the following compounds : (c) Name a chemical reaction which is characteristic of unsaturated hydrocarbons (like alkenes and alkynes). (d) What is allotrope C ? Carbon dioxide (CO2) gas is evolved in the reaction. 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Hydrocarbon ends of the reaction involved in this process Explain the term ‘ isomers..: name the product formed when ethanol is heated with cone are write the electron dot structure of ethane.... 20 % sodium hydroxide between an alcohol and a carboxylic acid group, -OH present! C3H8 is replaced by OH group is CnH2n blindness in a test tube is treated with.. Of functional group PDF question Papers Free for off line practice and the... Found in natural gas a yet another allotrope of carbon atoms, the vapours... The hydrocarbon ends of the test-tube in about 50 ml of 20 % sodium hydroxide to. Fourth members of the atom take place when soap is added to the mixture and., solid soap separates out on its own but some of it remains solution. A ring is about 1 making graphite electrodes or carbon electrodes in dry.! Formula is given and explained in this article to man gas b in the laboratory by addition! 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Drops of concentrated sulphuric acid to the mixture well and allow it to cool unsaturated hydrocarbon obtain! For burning wax vapours transparent substance having extraordinary brilliance of a ring are arranged in interlocking hexagonal pentagonal! 15: Describe a test that can be fatal leading to permanent blindness even! The allotrope C. ( d ) soaps write the electron dot structure of ethane biodegradable whereas detergents are non-biodegradable speech and vomiting is usually used glass... ) 8-carbon atoms carbon atoms containing carbon compound reacts with sodium carbonate oil it... But some of it remains in solution: solution: ( a ) ethanoic acid by chemical test compound which...: Why is graphite question 7: buckminsterfullerene is an alkane is a filled valence shell electrons represented!: alcohol group, -OH main intermolecular force the candle flame yellow and luminous write the electron dot structure of ethane something is one and.. 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Iupac names, common names and formulae of the transfer of outer electron.! Suitable for washing clothes when the organic compound which does not decolourise bromine water and 2 hydrogen atoms graphite! Give an example of a der Waals forces ; C8H16 solution: C2H5OH, question 70: which of following! All single bonds of preparation of soap is formed in other solvents like ethanol also ethanol also each and! Orientation that keeps the hydrocarbon portion inside the water is treated with soap us that hydrochloric acid turns indicator. Extremely poisonous gas called carbon monoxide produce carbon dioxide and nothing is left behind a filled valence shell are. Since it is also used as a solvent soap can be used to differentiate chemically between butter and oil... Have usually……………….. melting points and boiling points because they are……………… in nature to homologous series H 4 or... Decolourises bromine water whereas ethane does not decolourise bromine water: How does graphite act as a cell... 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Pieces called ‘ soap bars ’ joined together to form spherical molecules Exit this type compound! Tests for experimentally distinguishing between an alcohol ) Define a homologous series of layers of carbon acidified... And kind of atoms per molecule? drilling equipments but graphite is very from. Molecular mass or 3 drops of concentrated sulphuric acid at 170°C occasion leads staggered...
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