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stand Alone MCQs (1 Mark Each), , , , , , io jg not observed in a, following is ™ [CBSE SOP 2020], , ries? ‘, Change in chemical properties, . : —CH, and 44u molecular mass, , ) Difference in :, (C) Gradation in physical properties, (D) Same functional group, . Option (A) is correct., Explanation: No change in chemical properties |, | due to the presence of same functional group., , 2. Ethane, with the mo!, (A) 6 covalent bonds, (©) 8 covalent bonds, Ans. Option (B) is correct., j Explanation: Ethane has 7 covalent bonds. One, bond is between two carbon atoms and rest of, the six are between hydrogen atoms., covalent bonds by sharing its, four valence electrons with four univalent atoms,, , e.g. hydrogen. After the formation of four bonds,, carbon attains the electronic configuration of, , (A) helium (B) neon, (©) argon (D) krypton, Ans. Option (B) is correct., Explanation: The nearest inert gas from, carbon is Neon. An element try to attain the, electronic configuration of its nearest noble, gas while attaining a fully-filled outermost, shell., (All4. The correct electron dot structure of a water, molecule is :, (4) H-O-H (8) H:0-H, (0) H:0:H, , 4, Which of the, homologous Se!, , jecular formula C,H, has :, (B) 7 covalent bonds, (D) 9 covalent bonds, , 3. Carbon forms four c, , , , . Option © is correct., , oe In electron dot structure, Oxygen, a complete octet, while each atom of, tydrogen has two electrons in outermost shell., , oe, , Which of the followi, on for carbon een mS 5, i) These are good condu :, i) ; ctors of electricity., 2 nee ay Po conductors of opr, e i ‘, = te eae oe forces of attraction between, iv ese do not hi, . been ter eae forces of attraction, © Gandy B@andai, Ans. Option (D) is correct, Eh e, , , , , , , lanation: The atomic number of carbon ;, 6. So, its electron configuration is 2, 4, Chen, having four valence electrons forms cova 2, compounds which show less intermolecus:, attractions and do not have any free ee, to transmit electric current. Therefore, th s, are poor conductors of electricity. “, A molecule of ammonia (NH,) has:, (A) only single bonds, (B) only double bonds, (C) only triple bonds, (D) two double bonds and one single bond ®, ‘Ans. Option (A) is correct., Explanation: In ammonia covalent bond is, resent in which center nitrogen atom is, bonded with three hydrogen atoms through, single covalent bond., , Which of the following does not belong to the, , as, same homologous series?, (A) CH, (B) C,H,, (©) CH, (D) C,H, , Ans. Option (D) is correct., , Explanation: A series of compounds in, which the same functional group substitutes, for hydrogen in a carbon chain is called as, homologous series. The option (d) is alkene, that follows the general formula C,H}, while, others follow the general formula C,H,,, + 2, , Assertion and Reason Based MCQs, [ee eee, , (1 Mark Each), , , , , , A aeneatot |, , Directions : In the following questions,, tt of Reason (R), Assertion (A) is followed by a statemen, , Mark the correct choice as:, , (A) Both A and R are true and R is the, explanation of A., , (B) Both A and R are true but R is NOT the correct, explanation of A., , (C) Ais true but R is false., , (D) Ais false and R is true., , alcohols,, , (AI) 1. Assertion (A): In a homologous series of, the formula for the second member is C,H,OH an, the third member is C,H,OH. ee, Reason (R): The difference between the molecu A, masses of the two consecutive mem, homologous series is 144., Ans. Option (C) is correct., , correct, , , , , , Explanation: In homologous series of alcoho, the formula for the second member is The, and the third member is C,H,OH. of, difference between the molecular masses, the two consecutive members of 4 homologous, series is 14u.

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CARBON AND ITS COMPOUNDS, , ccertion (A): Following are the members. of, ere ie series CH,OH, CH,CH,OH,, CH,CH,CH,OH :, Reason (R): A series of compounds with same, functional group but differing by —CH, = unit is, called a homologous series, , [CBSE Dethi Set-I1, 2020], , o, , , , , , ‘Ans. Option (A) is correct,, , Explanation: Homologous series is a series of, compounds in which the members present, have the same functional group and similar, chemical properties and any two successive, members in a particular series differ in their, molecular formula by a - CH, unit. For, example, the series like methanol, ethanol,, propanol and so on is a homologous series of, alcohol., , Assertion (A): Following are the structural isomers, of butane., , oe, (ae cape, HHHH i a, a ee oe, ee |, , Reason (R): Structural isomers have the same, molecular formula but they differ in their structures., , [CBSE SOP, 2020], ;. Option (A) is correct., , Explanation: Isomers are defined as those, compounds that possess same molecular, formula but different structural arrangement., Butane has the molecular formulae C,H,o., Therefore, the structural isomers of butane will, be n-butane and iso-butane., 4. Assertion (A): Third member of alkane is propane, (CH,), Reason (R): It is obtained from general formula, , an +2, Ans. Option (A) is correct., , Explanation: C,H, can be obtained from, general formula, CHon 42° Where n = 3, , 5. Assertion (A): Carbon atoms have the ability to, form four strong covalent bonds., Reason (R): Carbon has the ability to make single,, double and triple bonds with itself., nS. Option (B) is correct., , its outermost shell. Therefore, it can form four, covalent bonds with other atoms or molecules, to complete its octet and reach noble gas, configuration, Also, carbon has the ability to, make single, double and triple bonds with it., 6 Assertion (A): Most of the carbon compounds are, 800d conductors of electricity., , ‘eason (R): They do not dissociate to form ions and, ng, Gmain as molecules., * Option (D) is correct., , Explanation; Carbon contains four electrons in |, , t, , Ans., , |, |, , , , Explanation: Carbon compounds are mainly, poor conductors of electricity because there is, no free electrons present to transmit electricity,, , Case-based MCQs (1 Mark Each), , , , , , Read the passage and answer the given questions., , , , A homologous series is a series of organic, compounds which belong to the same family, (i, possess same functional group) and show, similar chemical properties. The members of this, series are called homologous and differ from, each other by the number of CH, units in the, main carbon chain,, , , , , , , , The chemical properties of which of the following, compounds is similar to the butane ? {Rl, (A) Butyne (B) Propene, , (C) Propyne (D) Pentane, , Option (D) is correct., , Explanation: Methane, ethane, propane,, butane, pentane etc. are all part of the alkane, homologous series and have similar chemical, properties., , The difference between two consecutive members, in a homologous series in alkanes in terms of, molecular mass and number of atoms of elements, is: u, (A) 14a.m.u and CH, respectively, , (B) 12a.m.u and CH, respectively, , (C) 14a.m.uand CH respectively, , (D) 12a.m.u and CH, respectively, , . Option (A) is correct., , Explanation: Homologous series is a series of, compounds in which the members present, have the same functional group and similar, chemical properties and any two successive, members in a particular series differ in their, molecular formula by a -CH, unit., , Which of the following is not the property of a, homologous series ?, , (A) They show similar chemical properties., (B) They differ by 14 units by mass., , (C) They all contain double bond, , (D) They can be represented by a general formula., , a, , . Option (C) is correct., , + They have same general formula., Successive compounds differ by ~CH, unit., Successive compounds have molecular mass, difference of 14u., , Molecular mass increases down the series,, Therefore members of homologous series, show gradation in physical properties such, as melting point and boiling points., Members of homologous series show similar, chemical properties., , Explanation: The characteristics of a, homologous series are ;