InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
What is the correct order of decreasing stability of the following cations.(i) II > I > III(ii) II > III > I(iii) III > I > II(iv) I > II > III |
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Answer» (i) II > I > III |
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| 202. |
Correct IUPAC name for(i) 2- ethyl-3-methylpentane(ii) 3,4- dimethylhexane(iii) 2-sec-butylbutane(iv) 2, 3-dimethylbutane |
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Answer» (ii) 3,4- dimethylhexane |
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| 203. |
In which of the following compounds the carbon marked with asterisk is expected to have greatest positive charge?(i) *CH3—CH2—Cl(ii) *CH3—CH2—Mg+Cl–(iii) *CH3—CH2—Br(iv) *CH3—CH2—CH3 |
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Answer» (i) *CH3—CH2—Cl |
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| 204. |
Choose the correct pair. (a) n-pentane and iso pentane : position isomerism(b) neopentane and n-pentane : chain isomerism (c) propanal and propanone : position isomerism (d) propañoic acid and methyl acetate : chain isomerism |
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Answer» (b) neopentane and n-pentane : chain isomerism |
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| 205. |
The general formula for alkadiene is ……….(a) CnH2n(b) CnH2n-1(c) CnH2n-2(d) CnHn-2 |
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Answer» (c) CnH2n-2 The general formula for alkadiene is CnH2n-2. |
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| 206. |
The general formula of alkyne is ………. |
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Answer» CnH2n-2 The general formula of alkyne is CnH2n-2. |
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| 207. |
Match the following:List-IList-IIA.Aldehyde1.RCOOR1B.Carboxylic acid2.R-CO-O-CO-R1C.Ester3.R-CHOD.Acid anhydride4.R-COOHCode:ABCD(a)1324(b)2143(c)4231(d)3412 |
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Answer» The correct option is- (d) 3 4 1 2 |
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| 208. |
Match A and B with (i) and (ii) :A: alkynes (i) CnH2n+2 B: alkane (ii) CnH2n-2 |
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Answer» A: alkynes (ii) CnH2n-2 B: alkane (i) CnH2n+2 |
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| 209. |
Choose the correct pair. (a) CnH2n+2: C2H4 (b) CnH2n:C3H6(c) CnH2n-2: C2H6(d) CnH2n+2: C3H4 |
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Answer» (b) CnH2n : C3H6 |
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| 210. |
Give principles behind – (i) Crystallization (ii) Chromatography |
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Answer» (i) impure solid is dissolved in minimum amount of solvent, insoluble impurities are filtered out .solution containing soluble impurities is heated till crystallization point. The crystals of pure substance separate out leaving behind impurities in mother liquor. (ii) It is based on the principle of selective adsorption of the components of a mixture between two phases, stationary phase and a moving phase. When stationary phase is solid the basis is adsorption and when it is liquid the basis is partition. |
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| 211. |
In DNA and RNA nitrogen is present in the ring system. Can Kjeldahl method can be used for the estimation of nitrogen present in these?give reasons. |
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Answer» In DNA and RNA nitrogen is present in heterocyclic rings. Kjeldahl method can not be used to estimate nitrogen present in the ring because cannot be completely converted in to (NH4)2SO4 during digestion. Therefore Kjeldahl method cannot be used to estimate nitrogen present in DNA and RNA. |
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| 212. |
The formula for a substituted cycloalkane is shown below.C6H11CH3 (i) In the IUPAC system what is the root or base name of this compound? (ii) How many alkyl substituents are attached to the ring?(iii) Give the IUPAC name for this compound. |
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Answer» (i) cyclohexane (ii) 1 (iii) 1-Methyl cyclohexane |
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| 213. |
The formula for another cycloalkane derivative is shown below.C6H11CH2CH3(i) In the IUPAC system what is the root or base name of this compound? (ii) How many alkyl substituents are attached to the ring?(iii) Give the IUPAC name for this compound. |
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Answer» (i) cyclohexane (ii) 1 (iii) 1-Ethylcyclohexane |
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| 214. |
Which of the following selected chains is correct to name the given compound according to IUPAC system. |
| Answer» The four carbon chain. Selected chain should have maximum number of functional groups. | |
| 215. |
Name the following compounds according to the IUPAC system: |
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Answer» (1) 4-Bromo-2,3-dimethylhexane (2) 4,4-Dichloro-7-ethyl-3-methyl-7-neopentyldecane (3) 2-Bromo- 2- methylcyclohex-1,3-diene (4) 2-chloropent-1-en-4-yne (5) 1-Bromo-3-ethyl-5-methyl benzene |
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| 216. |
The line formula for a compound is shown below.(i) What IUPAC nomenclature suffix (ending) should be used for this compound? (ii) How many carbon atoms are in the longest carbon chain? (iii) How many carbon atoms are in the longest chain bearing the hydroxyl group? (iv) Give the IUPAC name for this compound. |
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Answer» (i) ol (ii) 6 (iii) 6 (iv) 3-Isobutylhexan-2-ol |
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| 217. |
In IUPAC nomenclaure of cyanide compound which suffix is added ?(A) cyano (B) cyanide (C) cyanate (D) nitrile |
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Answer» (D) nitrile |
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| 218. |
From which of the following compounds suffix "oate" is added ?(A) aldehyde (B) ketone (C) ester (D) ether |
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Answer» Ester is added |
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| 219. |
Name a compound which will give acetylene gas when treated with water. |
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Answer» CaC2 ; (calcium carbide) |
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| 220. |
Name a compound, which will give acetylene gas, when treated with water. |
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Answer» Calcium carbide. |
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| 221. |
Choosing only words from the following list, write down appropriate words to fill in the blanks from (a) to (e) given below. Addition, carbohydrates, CnH2n-2, CnH2n, CnH2n+2, electrochemical homologous, hydrocarbon, saturated, substitution, unsaturated.The alkanes form an (a) ___________ series with the general formula (b) __________ The alkanes are (c)____________ (d)__________ which generally undergo (e) ________ reactions |
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Answer» The alkanes form an (a) Homologous series with the general formula (b) CnH2n+2. The alkanes are (c) saturated (d) hydrocarbon which generally undergo (e) substitution reactions. |
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| 222. |
Name three compounds formed by ethylene and give the use of these compounds. |
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Answer» Three compounds formed by ethylene are: Polythene Ethanol Epoxyethane Uses of above compounds: Polythene is used as carry bags. Ethanol is used as a starting material for other products, mainly cosmetics and toiletry preparation. Epoxyethane is used in the manufacture of detergents. |
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| 223. |
Select the correct IUPAC name for: |
| Answer» 2,3-dimethylcyclopentane | |
| 224. |
Give two tests to show that CH3COOH is acidic in nature. |
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Answer» Test to show that CH 3COOH is acidic are: When litmus test is done, it turns blue litmus red. It reacts with bases to form salt and water. |
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| 225. |
The IUPAC name of is........... |
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Answer» 2, 2, 5-trimethyl heptane |
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| 226. |
2-butene is an example of ............... compound. |
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Answer» unsaturated open chain |
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| 227. |
Match the following:List-IList-IIA.1,3-butadiene1.B.Tert. butyl chloride2.C.n-propanol3.D.1,3-dimethyl-cyclo pentane4.Code:ABCD(a)4132(b)3421(c)2314(d)1243 |
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Answer» The correct option is- (a) 4 1 3 2 |
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| 228. |
Explain the method used for the detection of halogens. |
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Answer» The sodium fusion extract is acidified with nitric acid and then treated with silver nitrate. A white precipitate, soluble in ammonium hydroxide shows the presence of chlorine, a yellowish precipitate, sparingly soluble in ammonium hydroxide shows the presence of bromine and a yellow precipitate, insoluble in ammonium hydroxide shows the presence of iodine. X– + Ag+ ⎯→ AgX X represents a halogen – Cl, Br or I. |
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| 229. |
0.257g of organic substance was heated with conc. sulphuric acid and then distilled with excess of strong alkali .the ammonia gas evolved was absorbed in 50ml of .1M HCl which required 23.2ml of c for neutralization at the end of the process. Determine the % of nitrogen in the compound? |
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Answer» Vol of 0 .1M HCl taken = 50ml Vol of .1MNaOH used for neutralization of unused acid=23.2ml Now, 23.2 ml of .1MNaOH =23.2ml of .1MHCl Vol of .1MHCl unused=23.2ml Vol of .1MHCl required for neutralization of NH3 = 50-23.2=26.8ml 26.8ml of .1MHCl=26.8ml of .1M NH3 100ml of 1M NH3 solution contain nitrogen=14g 26.8 ml of .1M NH3 solution contain nitrogen = 14*26.8/10*1000 Percentage of Nitrogen=14*26.8*100/10*1000*.257 =14.6% |
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| 230. |
How many σ and π bonds are present in each of the following molecules?(a) HC≡CCH=CHCH3 (b) CH2=C=CHCH3 |
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Answer» (a) σC – C: 4; σC–H : 6; πC=C :1; π C≡C:2 (b) σC – C: 3; σC–H: 6; πC=C: 2 |
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| 231. |
What is the type of hybridisation of each carbon in the following compounds?(a) CH3Cl, (b) (CH3)2CO, (c) CH3CN, (d) HCONH2, (e) CH3CH=CHCN |
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Answer» (a) sp3, (b) sp3, sp2, (c) sp3, sp, (d) sp2, (e) sp3, sp2, sp2, sp |
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| 232. |
Distinguish between qualitative and quantitative analysis. |
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Answer» Qualitative analysis means is to detect the various elements present in it. Quantitative Analysis means is to determine the percentage of each element. |
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| 233. |
During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results? (i) Column chromatography (ii) Solvent extraction (iii) Distillation (iv) Thin layer chromatography |
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Answer» (iv) Thin layer chromatography (TLC) is used to separate the pigments present in ink. |
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| 234. |
The principle involved in paper chromatography is(i) Adsorption(ii) Partition(iii) Solubility(iv) Volatility |
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Answer» (ii) In paper chromatography, separation of the components of a mixture depends upon their partitioning between water held in the stationary phase (i.e. adsorbent paper) and the liquid present in the mobile phase. |
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| 235. |
Explain Thin layer chromatography (TLC) and Partition chromatography. |
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Answer» Thin layer chromatography (TLC) is type of adsorption chromatography, which involves separation of substances of a mixture over a thin layer of an adsorbent coated on glass Plate. Partition chromatography is based on continuous differential partitioning of components of a mixture between stationary and mobile phases. |
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| 236. |
Copy and complete the following table which relates to three homologous series of Hydro-carbons :Ganeral formulaCaH2nCnH2n-2CnH2n+2IUPAC name of the homolo-gous seriesCharacteristic bond typeSingle bondsIUPAC name of the first member of the seriesType of reaction with chlorine.Addition |
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Answer»
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| 237. |
Explain the terms Esterification. |
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Answer» Esterification – It is known as condensation of an alcohol with an acid. Acetic acid on heating with an alcohol and dehydrating agent [cone. H2SO2 ] gives an ester – ethyl acetate. |
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| 238. |
Write the IUPAC names of: |
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Answer» (a) Propene (b) 2-butyne (c) ethanal |
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| 239. |
Select the correct answer the choices given : 1. The catalyst used for conversion of ethene to ethane is commonly……… [nickel/iron/cobalt] 2. Acetaldehyde when oxidized with acidified potassium dichromate, forms ……… [ester/ethanol/ acetic acid] 3. Ethanoic acid reacts with ethanol in presence of cone. H2SO4 , so as to form a compound and water. The chemical reaction which takes place is called…………[dehydration/hydrogenation/esterification] |
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Answer» 1. Nickel 2. Acetic acid 3. Esterification |
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| 240. |
Identify the term/substance in each of the following : 1. The catalyst used in the conversion of ethyne to ethane. 2. The type of reactions alkenes undergo. |
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Answer» 1. Nickel or platinum or palladium. 2. Addition reactions. |
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| 241. |
Explain the term Glacial acetic acid . |
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Answer» Glacial acetic acid – Anhydrous acetic acid on cooling below 16.5°C crystallizes out in the pure form, forming a crystalline mass resembling ice. Hence pure acetic acid is called glacial acetic acid. |
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| 242. |
Explain the term Denaturated alcohol. |
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Answer» Denaturated alcohol – Ethyl alcohol containing pyridine or copper sulphate is termed – denaturated alcohol. It is used for – industrial applications only and hence made undrinkable. |
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| 243. |
The melting point of three members X, Y, and Z of a homologous series of hydrocarbons are -180°C, -140°C and -30°C respectivelyWhich one of the three have the maximum number of carbon atoms in its molecule ? Justify your answer. |
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Answer» The homologue with maximum number of carbon atoms in its molecule has the highest melting point. Therefore, compound Z has the maximum number of carbon atoms in its molecules. It is clear from the given values of melting point in which 30°C is the highest of the three. |
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| 244. |
Define substitution and addition reaction. |
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Answer» Substitution reaction: A reaction in which one atom of a molecule is replaced by another atom (or group of atoms) is called a substitution reaction. Addition reaction: A reaction involving the addition of atom(s) or molecules(s) to the double or the triple bond of an unsaturated compound so as to yield a saturated product is known as addition reaction. |
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| 245. |
Give reason for the existence of the large number of organic compounds. |
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Answer» Due to the presence of unique properties of carbon like Tetravalency, catenation and Isomerism, the large number of organic compounds are formed. |
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| 246. |
What is hydrogenation ? |
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Answer» Addition of hydrogen to some unsaturated hydrocarbons is called hydrogenation. |
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| 247. |
A compound has triple bond in its molecule and has only two carbon atoms with two hydrogen atoms. Name the compound. |
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Answer» Acetylene H-C ≡ C-H. Or Acetylene. |
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| 248. |
In which of the following molecule carbon-carbon bond length is least ? (A) ethane (B) ethene (C) ethyne (D) benzene |
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Answer» (C) ethyne |
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| 249. |
Give atleast two methods of purification of organic compounds. |
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Answer» Sublimation Crystallization |
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| 250. |
Explain why (CH3)3C+ is more stable than CH3C+H2 and C+H3 is the least stable cation. |
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Answer» Greater the number of alkyl groups attached to a positively charged carbon atom, the greater is the hyperconjugation interaction and stabilisation of the cation. |
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