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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.
| 51. |
The compound formed in the positive test for neitrogen with Lassaigne solution of an organic compoundA. `Na_(4)[Fe(CN)_(5)NOS]`B. `Na_(3)[Fe(CN)_(6)]`C. `Fe(CN)_(6)]`D. `Fe_(4)[Fe(CN)_(6)]_(3)` |
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Answer» Correct Answer - D `NaCN overset(FeSO_(4))rarr Na_(4) [Fe(CN)_(6)]overset(Fe^(3+))rarr underset((blue))(Fe_4[Fe(CN)_6]_3)` |
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| 52. |
The empirical formula of an acid is `CH_(2)O_(2)` the probable molecular formula of the simplest acid may beA. `CH_(2)O`B. `CH_(2)O_(2)`C. `C_(2)H_(4)O_(2)`D. `C_(3)H_(6)O_(4)` |
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Answer» Correct Answer - B The simplest organic acid containing COOH gorup is HCOOH. |
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| 53. |
A compound (X) has the molecular formula ` C_3 H_7 NO` . With ` Br_2` and ` KOH`, (X) gives (Y) . (Y) responds to mustard oil reaction . (Y) upon treatment with ` HNO_2` evolves `N_2` and gives an alcohol (Z) which gives iodoform test , (X) is likelty to be :A. `C_2H_5CONH_2`B. `CH_3COHH_2`C. `CH_3COONH_4`D. `C_2H_5CNO` |
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Answer» Correct Answer - A Reaction of (X) with ` Br_2 + KOH` suggests that (X ) is and amide Evoltion fo ` N_2` and frmation of alcohol suggest theat (Y) is a ` 1^@` aliphbatic amine. Lodoform test of (Z ) suggests that it is an alcohl of the type |
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| 54. |
A purified pepsin was subjected to amino acid analysis. The amino acid present in smallest amount was lysine, `C_(6)H_(14)N_(2)O_(2)` and the amount of lysine was found to be 0.43 g per 100 g of protein. The minimum molecular mass of protein isA. 34000B. 14600C. 43000D. None to these. |
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Answer» Correct Answer - A Mol. Mass of lysine `(C_6H_(14)N_2O_2)`=146 Min.mol. Mass `=(100 xx "Mol . Mass of lysine")/("% of lysine in the pepsin")` `(100xx146)/(0.43)=(1460000)/(43)`= 340000 (approx) |
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| 55. |
Anthracene is purified byA. FiltrationB. Crystallization C. DistillationD. Sublimation |
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Answer» Correct Answer - D See Comprehensive Review. |
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| 56. |
Impure glycerine is purified byA. Steam distillation B. Simple distillationC. vacuum distillationD. None |
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Answer» Correct Answer - C Refer to comprehensive Review |
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| 57. |
substance which decomposes below its boiling Point can be best purified by 4A. Steam distillation B. Simple distillationC. Fractional distillationD. Distillation under reduced pressure. |
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Answer» Correct Answer - D Distillation under reduced pressure makes the substance to boil at low temperature and there- fore the liquid can be distilled without decom- position. |
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| 58. |
Naphthalene is a volatile solid. It is best purified by:A. (A) sublimationB. crysrtallistionC. distillation extraction with solvent .D. |
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Answer» Correct Answer - A Refer to Comprehensive Review. |
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| 59. |
Arrange the Floroacetic acid, monochloroacetic acid, Acetic acid and Dichloroacetic acid (acid stength) compounds in increasing order of their property indicated. |
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Answer» Acid strength of given compounds is Dichloro acetic acid `gt` Fluorr acetic acid `gt` chloro acetic acid `gt` acetic acid. |
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| 60. |
Write structures of the `CH_(3)CH_(2)COCH(C_(2)H_(5))CH_(2)CH_(2)Cl` compound according to IUPAC system of nomenclature . |
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Answer» IUPAC name of `CH_(3)CH_(2)COCH(C_(2)H_(5))CH_(2)CH_(2)Cl` `{:(" "O),(1" "2" "3"||"" "4" "5" "6),(CH_(3)-CH_(2)-C-underset(C_(2)H_(5))underset(|)(CH)-CH_(2)-CH_(2)-Cl):}` IUPAC Name :6-chloro-4-ethyl hexan -3-one |
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| 61. |
Give IUPAC names of the |
| Answer» Correct Answer - 2,6-Dimethylphenol | |
| 62. |
Give IUPAC names of the following compounds: (i) `CH_(3) -underset (Cl) underset (|) (CH) - underset (CH_(3)) underset (|) (CH) - underset (CH_(3)) underset (|)(CH) - CH_(2)OH ` (ii) `CH_(3) - underset (CH_(3)) underset (|) (CH) - O - CH_(2)CH_(3)` (ii) |
| Answer» 4-Chloro-2,3-dimethylpentan-I-ol | |
| 63. |
Predict the products of the `R-CH=CH-CHO + NH_(2)-overset(O) overset(|)C-NH-NH_(2) overset(H^(+))` reaction. |
| Answer» `R-CH=CH-CH=N-NH-overset(O)overset(|)C-NH_(2)` | |
| 64. |
Give the IUPAC name of the compound. |
| Answer» 2-Metylcyclopenzoic acid | |
| 65. |
Write the IUPAC name of the `C_(6)H_(5)-OC_(2)H_(5)` |
| Answer» `C_(6)H_(5)-O-C_(2)H_(5)" "` 1-Phenoxy ethane | |
| 66. |
Give IUPAC names of the `CH_(3)-underset(CH_(3))underset(|)CH-O-CH_(2)CH_(3)` |
| Answer» Correct Answer - 2-Ethoxypropane | |
| 67. |
Give the IUPAC name of the `(CH_(3))_(2)C=CHCOOH` compound. |
| Answer» 3-Mehtylbut-2-enoic acid | |
| 68. |
Give the IUPAC name of the `Ph CH_(2)CH_(2)COOH` compound. |
| Answer» 3-Phenylpropanoic acid | |
| 69. |
Write the IUPAC name of the `CH_(3)-O-CH_(2)-underset(CH_(3))underset(|)CH-CH_(3)` compound. |
| Answer» `CH_(3)-O-overset(1)CH_(2)-underset(CH_(3))underset(|)overset(2)(CH)-overset(3)CH_(3)" "` 1-Methoxy-2-methyl propane | |
| 70. |
Name the `CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)-underset(OH)underset(|)CH-overset(CH_(2)OH)overset(|)CH-CH_(3)` compound according to IUPAC system. |
| Answer» 2,5-Dimethylhexane-1,3-diol | |
| 71. |
Write the IUPAC name of the `CH_(3)-underset(OH)underset(|)CH-CH_(2)-underset(OH)underset(|)CH-underset(C_(2)H_(5))underset(|)CH-CH_(2)-CH_(5)` compound. |
| Answer» `overset(1)(CH_(3))-underset(OH)underset(|)overset(2)(CH)-overset(3)(CH_(2))-underset(OH)underset(|)overset(4)(CH)-underset(C_(2)H_(5))underset(|)overset(5)(CH)-overset(6)(CH_(2))-overset(7)(CH_(3))" "` 5-Ethyl heptane-2,4-diol | |
| 72. |
Which the IUPAC name of `CH_(3)CH_(2)CH(Br) CH_(2)COOH` |
| Answer» `{:(CH_(3)-CH_(2)-overset(Br)overset(|)CH-CH_(2)-COOH),(" "5" "4" "3" "2" "1),("3-Bromo Pentanoic acid"):}` | |
| 73. |
Write the IUPAC name of the `CH_(3)-underset(CH_(3))underset(|)CH-underset(OH)underset(|)CH-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(3)` compound. |
| Answer» `overset(5)(C)H_(3)-underset(CH_(3))underset(|)overset(4)(C)H-underset(OH)underset(|)overset(3)(C)H-underset(CH_(3))underset(|)overset(CH_(3))overset(2|)C-overset(1)CH_(3)" "` 2,24-Tri methyl 3- pentanol | |
| 74. |
Name the `CH_(3)-underset(CH_(3))underset(|)C=underset(Br)underset(|)C-CH_(2)OH` compound according to IUPAC system. |
| Answer» 2-Bromo-3-methylbut-2-en-1-ol | |
| 75. |
What is Tollens reagent ? Explain its reaction with Aldehydes. |
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Answer» Tollens Reagent : Freshly prepared ammonical silver nitrate solution is called Tollens reagent. `to` On warming an aldehyde with Tollens reagent a bright silver mirror is produce due to formation of silver metal. `R-CHO+2[Ag(NH_(3))_(2)]^(+) + 3OH^(-) to RCOO^(-) + 2Ag + 2H_(2)O + 4NH_(3)` |
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| 76. |
Show how are the `CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)OH` alcohol prepared by the reaction of a suitable Grignard reagent of methanol ? |
| Answer» `CH_(3)-underset(CH_(3))underset(|)CH-MgBr+HCHO to CH_(3)-underset(CH_(3))CH-overset(OMgBr)overset(|)CH_(2)overset(H_(2)O)to CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)OH+Mg(OH)Br` | |
| 77. |
Classify the following as primary, secondary and tertiary alcohols: (i) `CH_(3) - overset(CH_(3)) overset (|) underset (CH_(3)) underset(|) C - CH_(2)OH ` (ii) `H_(2)C = CH- CH_(2) OH` |
| Answer» Correct Answer - Primary alcohols | |
| 78. |
Classify the as primary , secondary and tertiary alcohols. |
| Answer» Correct Answer - Secondary alcohols | |
| 79. |
Classify the `H_(2)C=CH-CH_(2)OH` as primary , secondary and tertiary alcohols. |
| Answer» Correct Answer - Primary alcohols | |
| 80. |
Arrange the following compounds in the increasing order of their boiling points: `CH_(3)CH_(2)CH_(2)CHO, CH_(3)CH_(2)CH_(2)CH_(2)OH, H_(5)C_(2)-O-C_(2)H_(5), CH_(3)CH_(2)CH_(2)CH_(2)CH_(3)` |
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Answer» The molecular masses of these compounds are in the range of 72 to 74 . Since only butan-1-ol molecules are associated due to extensive intermolecular hydrogen bonding, therefore, the boiling point of butan-1-ol would be the highest . Butanal is more polar than ethoxyethane. Therefore, the intermolecular dipole-dipole attraction is stronger in the former. n-Pentane molecules have only weak vander Waals forces. Hence increasing order of boiling points of the given compounds is as follows : `CH_(3)CH_(2)CH_(2)CH_(2)CH_(3) lt H_(5)C_(2)-O-C_(2)H_(5) lt CH_(3)CH_(2) CHO lt CH_(3)CH_(2)CH_(2)CH_(2)OH` |
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| 81. |
The compound `(B)` and (C ), respectively, are:A. a.B. b.C. c.D. d. |
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Answer» Correct Answer - B `MnO_(2)` selectively oxidises allylic or banzylic hydroxyl group to `(C=O)` group, whereas Jones reagent oxidises `1^(@)` and `2^(@) ROH` to aldehydes and ketones, respectively. So, the answer is `(b)`. |
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| 82. |
` The products (A) and (B), respectively, are:A. a.B. b.C. c.D. d. |
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Answer» Correct Answer - C `(A) implies HI+P` reduces epoxides to alkanes. `(B) implies LAH` reduces expoxides to two different alcohols by cleaving the group from either side. |
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| 83. |
Write the structures of the 3-Hydroxybutanal compound. |
| Answer» `H_(3)C-overset(OH)overset(|)CH-CH_(2)-overset(O)overset(||)-H` | |
| 84. |
Draw the structure of the 3-Methylbutanal compound. |
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Answer» 3-Methyl butanal `underset("3-methyl butanal")(overset(4)(CH_(3))-overset(CH_(3))overset(3|)CH-overset(2)CH_(2)-overset(1)CHO)` |
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| 85. |
Nitromethane is subjected to treatment with chlorine in the presence of sodium hydroxide, the main product is:A. MonochloronitromethaneB. TrichloromethaneC. ChloropicrinD. None of the above |
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Answer» Correct Answer - C `H_3C-NO_2overset(Cl_2+NaOH)to underset("Chloropicrin" (tear gas))(Cl_3C-NO_2)` |
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| 86. |
Tertiary nitro compounds cannot show tautomerism becauses :A. They are very stable .B. They isomerise to give secondary intro compoundsC. They do not have labile hydrogen atom.D. They are highly reactive . |
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Answer» Correct Answer - C Nitroalkane containing `alpha-H` atoms , I, e.,e `1^@` and `2^(@)` nitro alkance show tautomerism. |
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| 87. |
A clear solution is heated in a china dish where upon a solid separates from the hot solution. It is due to the fact thatA. the solid has a positive enthalpy of solutionB. the solid has a negative enthalpy of solutionC. solvent has evaporatedD. the solute is volatile. |
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Answer» Correct Answer - A::C (a ) If the solid has positive enthalpy of solution,its solubility will decrease with increase in temperature and the solid will separate out on heating. (c) The solid can also separate out on the evaporation of the solvent. |
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| 88. |
Which of the following has molecular weight of 92 ?A. TolueneB. BenzeneC. MethyleneD. Propene |
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Answer» Correct Answer - A M. mass of toluene =92 |
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| 89. |
Give the structures and IUPAC names of the products expected from the Hydration of propene in the presence of dilute sulphuric acid. |
| Answer» `underset("Propan-2-ol")(CH_(3)-underset(OH)underset(|)CH-CH_(3))` | |
| 90. |
Which of the following is the scientific method to test presence of water in a liquid ?A. SmellB. TasteC. Use of litmus paperD. Use of anhydrous copper sulphate |
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Answer» Correct Answer - D It turns anhydrous `CuSO_4` blue Anhy.`underset(("White")" "(Blue))(CuSO_4+5H_2OrarrCuSO_(2).5H_2O` |
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| 91. |
The technique of gas chromatography is suitable for compounds which are A. Liquids B. Highly volatile C. Soluble in water 1 D. Vaporised without decomposition. |
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Answer» Correct Answer - D Compounds which vaporise without decomposition . |
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| 92. |
What of the following statements are correect?A. The extent of `H`-bonding is greater in `1^(@)` than `2^(@)` and `3^(@)` amines.B. The boiling points of isomeric amines are in the order: `1^(@)gt2^(@)gt3^(@)`.C. The boiling points of D. The boiling points of `(I) C_(4)H_(9)NH_(2) gt (II) Me_(2)N-Et gt (III) (C_(2)H_(5))_(2)NH`. |
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Answer» Correct Answer - C::D (d) The ordie of biling points is ` : 1^@ gt 2^@ gt 3^@ (I gt IIIgt III)` `1^@` amine forms moreH-bonding with ` 2H` than ` 2^@` amine (1H) and than `3%^@` amine |
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| 93. |
Indicate which nitrogen compound amonfst the following would undergo Hofmann reaction (i.e., reaction with ` Br-2` and strong `KOH`) tom furmish the primary amine `(R-NH_2)`.A. `RCONHCH_3`B. `RCOONH_2`C. `RCONH_2`D. `R-CO-NHOH` |
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Answer» Correct Answer - C Amides give Hofmann bromamide reaction. |
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| 94. |
The producet of the reaction of alcoholic silver nitrite with ethyl bromide is :A. Ethane nitrileB. EtheneC. NitroethaneD. Ethyl alcohol |
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Answer» Correct Answer - C ` C_2 H_2 Br underset (AgNO_2) overset (alc.) (rarr) underset ("Nitroethanc" ) (C_2 H_5 NO_2)`. |
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| 95. |
Give the decresing order of boiling points for the following : I. `Et_2NH` II |
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Answer» a. `(II) gt (II) gt (III) (1^@ gt 2^@gt 3^@` amine ) b. `(II) gt (III) gt (I`) (alcohol `gt` amine `gt` alkane ) H-bonding in alcohol is stronger than in amine since the ` EN ` of ` o gt N`. Alamne does not form `H-`bonding . |
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| 96. |
Assertion(A) : Aniline hydrogen sulphate on heating froms a mixture of o- and p-amineo- sulphonic acid . Reason (R ) : The suphonic acid is ` overline e withdrawing .A. If both (A) and (R ) ar true, and (R ) is the correct explanation of (A).B. If both (A) and (R ) are true , and (R ) is not the correct explanation of (A).C. If (A) is true , but (R ) is false .D. If both (A) and (R ) are false . |
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Answer» Correct Answer - B Correct exphanation : Aniline hydrogen sulp-hate on heating decomposes to aniline and ` H_2SO_4`. Sulphonation fo aniline with ` H_2SO_4` takes place (SE resaction ) at o- and p-positions , since `(-NH_2)` group is o- p-directing . |
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| 97. |
Which of the following are Cope reactions?A. B. C. D. |
| Answer» Correct Answer - A::D | |
| 98. |
Which of the following reagents are correct for the given reaction? A. (i) `NaNO_(2) + HCl, 0-5^(@)C`, (ii) `H_(3)PO_(2)`B. (i) `KNO_(2) + HBr, 0-5^(@)C`, (ii) `Na_(2)SnO(2)`C. (i) `HNO_(2)`, (ii) `C_(2)H_(5)OH` and heatD. (i) `KNO_(2) + HCl`, (ii) `H_(2)O` (Steam) |
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Answer» Correct Answer - A::B::C Diazonium ion can be replaced by (H) by (a) `H_3 PO_2` or (b) `NaSnO_2` or (c ) `C_2 H_4 OH` and heat . |
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| 99. |
Assertion (A) : `Ph overset (o+)(N_2) Br^(Θ)` couples with `N, N`-dimethyl aniline (I) but not with ` 2,6,`-dimethyl-`N,N`-dimethuyl aniline (II) Reason (R ): Due to steric inhibition of resonce , the p-potion of (II) is not sufficiently activated fro the coupling reation. Due to steric inhibition of resonamne, the p-position of (II) is not sufficiently activated for the coupling reaction.A. If both (A) and (R ) ar true, and (R ) is the correct explanation of (A).B. If both (A) and (R ) are true , and (R ) is not the correct explanation of (A).C. If (A) is true , but (R ) is false .D. If both (A) and (R ) are false . |
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Answer» Correct Answer - A Both (A) and (R ) are tre and (R ) is he correct explanation of (A). |
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| 100. |
Assertion (A) : `Ph overset (o+) (N_2) Br^(Θ)` is more acidic than ` NH_4 Br`. Reason (R ) : `Ph overset (o+)(N)H_(3)` (anilinum ion ) is resonance stabilinsed .A. If both (A) and (R ) ar true, and (R ) is the correct explanation of (A).B. If both (A) and (R ) are true , and (R ) is not the correct explanation of (A).C. If (A) is true , but (R ) is false .D. If both (A) and (R ) are false . |
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Answer» Correct Answer - C `NBH_2` is stronger base than aniline , therfore , the cojugate acid of aniline (i.e., `Ph overset (o+) (N) H_3)` is more acidic than the conjugate acid of `NH_3` (i.e, `overset (o+) (N) H_4` ion). |
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