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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 % of sulphur in an organic compound whose 0.32 gm. Produde 0.23 gm of `BaSO_(4)` (At. Wt `Ba=137, S=32`)A. `1.0`B. `10.0`C. `23.5`D. `32.1` |
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Answer» Correct Answer - B % of `S=32/233xx0.233/0.32xx100=10` |
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| 52. |
An organic compound `%` of C and % of H in the ratio `6 : 1` and `%` of C and % of O in the ratio `3 : 4`. The compound isA. `HCHO`B. `CH_(3)OH`C. `CH_(3)CH_(2)OH`D. `(COOH)_(2)` |
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Answer» Correct Answer - A Let `%` of hydrogen is x then `%` of carbon is `6x` and `%` of Oxygen is `8x` i.e., `x+6x+8x=100 rArr x = (100)/(15)` `C 600//15% rArr 40//12 = 3.3333 rArr 1` `H 100//15% rArr 100//15 = 6.6667 rArr 2` `O 800//15% rArr 50//15 = 3.333 rArr 1` `CH_(2)O` is the empirical formula. |
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| 53. |
Compound A (molecular formula `C_(3)H_(8)O`) is trated with acidified potassium dichromate to form a product B (molecular formula `C_(3)H_(6)O`). B form a shining silver mirror on warming with ammonical silver nitrate. B when treted with an aqueous solution of `H_(2)NCONHNH_(2).HCl` and sodium acetate gives a productC. Identify the structure of CA. `CH_(3)CH_(2)CH = NNNHCONH_(2)`B. `CH_(3)-underset(CH_(3))underset(|)(C ) = NNHCONH_(2)`C. `C_(3)H_(4)O`D. `C_(4)H_(8)O` |
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Answer» Correct Answer - A `underset((A))(C_(3)H_(8)O )overset(K_(2)Cr_(2)O_(7)H^(+))rarrunderset((B))(C_(3)H_(6)O)overset(" amm" AgNO_(3))rarr " Silver mirror" overset(H_(2)NCONHNH_(2)HCl)rarr C` Reaction of (B) indicates that it is an aldehyde which thus should be `C_(2)H_(5)CHO` or `CH_(3)CH_(2)CHO` hence C should be `CH_(3)CH_(2)CH = "NNHCONH"_(2)` |
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| 54. |
Give test to differentiate 1,1-dichloroethane and 1,2-dichloroethane :A. 2,4-DNP then aq. KOHB. aq. KOH then 2, 4-DNPC. `NaHSO_(3)`D. Lucas reagent |
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Answer» Correct Answer - B (B) `CH_(3)-underset(Cl)underset(|)(CH)-Cl overset(aq. KOH)rarr CH_(3)-CHO overset(2,4-DNP)rarr+ve` test `underset(Cl)underset(|)(CH_(2))-underset(Cl)underset(|)(CH_(2))overset(aq.KOH)rarr underset(OH)underset(|)(CH_(2))-underset(OH)underset(|)(CH_(2)) overset(2,4-DNP)rarr -ve` test. |
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| 55. |
Ethylamine and diethylamine cannot be differentiated by :A. Hinsberg testB. carbylamine testC. Iodoform testD. both (a) and (b) |
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Answer» Correct Answer - C `Et-NH_(2) rarr -ve` iodoform `Et-NH-Et rarr -ve` iodoform |
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| 56. |
Give test to differentiate (Bromobenzene) Ph-Br and benzyl bromide `(PhCH_(2)Br)`.A. (i) aq. KOH (ii) NaB. `AgNO_(3)`C. `KMnO_(4)`D. All of these |
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Answer» Correct Answer - D `(a rarr H_(2))` will evolve with `Ph-CH_(2)-Br` `(b rarr AgCl)` will form with `Ph-CH_(2)-Br` `(c rarr Ph-CO_(2)H)` will form with `PH-CH_(2)-Br`. |
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| 57. |
An organic compound having `C,H` and sulphur contains `4%` of sulphur. The minimum molecular weight of compound isA. 200B. 400C. 600D. 800 |
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Answer» Correct Answer - D `%` of `S = ("wt. of 1 sulphur atom")/(" Minimum mol. Wt.") xx 100` `4 = (32)/(" Minimum mol.wt.") xx 100` Minimum mol. Wt =` 800 g mol^(-1)` (a) , (b) and (c ) are not possible. Alternate Method: A compound must have at leat one atom of S i.e, `32g` of S. 4g of sulphur is present in 100 g of compound. `32g` of sulphur will be present in `(100)/(4) xx 32 = 800 g mol^(-1)`. |
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| 58. |
The molecular mass of an organic compound containing one atom of nitrogen can beA. 41B. 76C. 146D. 152 |
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Answer» Correct Answer - A All compounds containing an odd number of nitrogen atoms have odd molar mass and with even number of nitrogen atoms have even molar mass. Therefore, option (a) is correct . It is called nitrogen rule (b), (c ) and (d) are ruled out. |
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| 59. |
Thiophene can be removed from commericial benzene vyA. Shaking it with mixture of conc. `HNO_(3)` and `H_(2)SO_(4)`B. Shaking it with mixture of conc. `HNO_(3)` and `H_(2)SO_(4)`C. Distillation under reduced pressureD. Steam distillation |
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Answer» Correct Answer - B Thiophene can be easily sulphonated to form thiophene -2- sulphonic acid thus dissolves in conc. `H_(2)SO_(4)` whereas benzene does not. |
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| 60. |
Aniline can be separated from phenol usingA. `Na_(2)CO_(3)`B. `NaNO_(2) + HCl` at `0^(@) C`C. `NaCl`D. Acidified `KMnO_(4)` |
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Answer» Correct Answer - B Aniline and phenol can be separated by adding `NaNO_(2) + HCl` as aniline forms diazonium salt anilinium chloride, while phenol does not. Hence, choice (b) is correct. Choice (a) is incorrect because `Na_(2)CO_(3)` neither reacts with aniline nor with phenol. Choice (c ) is incorrect because `NaCl` does not react with phenol. Choice (d) is incorrect because `KMnO_(4)` oxidies both aniline and phenol. |
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| 61. |
To determinent the weight of a halogen in orangic compound, the compound is heated fuming `HNO_(3)` in presence ofA. `Ag`B. `AgNO_(3)`C. `CH_(3)CONH_(2)`D. `Ag_(2)SO_(4)` |
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Answer» Correct Answer - B Hydrazine the weight of a halogen in organic compound, the compund is heated with funning `HNO_(3)` in resence of `AgNO_(3)`. ` X+AgNO_(3)toAgXdarr` (halogen) |
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| 62. |
Assertion : Oils are purified by steam distillation. Reason : The compound which decompose at their boiling points can purified by steam distillation.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reson is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false. |
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Answer» Correct Answer - C Steam distillation is carried out only when a solid or liquid in insoluble in water and volatile with steam but the impurities are non-volatile. |
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| 63. |
Which of the following compounds produce `CO_(2)` on reaction with `NaHCO_(3)` ?A. B. C. D. |
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Answer» Correct Answer - A::C::D |
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| 64. |
Which of the following compounds will react with `NaNH_(2)`?A. `CH_(3)--= CH`B. C. D. `Ph-underset(O)underset(||)overset(O)overset(||)(S)-OH` |
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Answer» Correct Answer - A::B::C::D |
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| 65. |
`60g` of compound on analysis gave `C = 24g, H= 4 g` and `O = 32g`. If Empirical formula isA. `C_(2)H_(4)O_(2)`B. `C_(2)H_(2)O`C. `CH_(2)O_(2)`D. `CH_(2)O` |
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Answer» Correct Answer - D `{:("Element"," NO. of moles"," Simple ratio"),(C =24,24//12=2,1),(H=4,4//1=4,2),(O=32,32//16,1):}` Therefore `CH_(2)O`. |
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| 66. |
A gaseous hydrocarbon gives upon combustion `0.72 g` of water and `3.08` f of `CO_(2)`. The empirical formula of hydrocarbon isA. `C_(2)H_(4)`B. `C_(3)H_(4)`C. `C_(6)H_(5)`D. `C_(7)H_(8)` |
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Answer» Correct Answer - D `18g H_(2)O` contains `2g H` `:. 0.72 g H_(2)O` contains `0.08 g H` `44 g CO_(2)` contains `12 g C` `:. 3.08 g CO_(2)` contains `0.84 g C` `:. C : H = (0.84)/(12): (0.08)/(1) = 0.07:00.08 = 7 : 8` `:. ` Empirical formula `= C_(7)H_(8)`. |
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| 67. |
Identify the correct set of stereochemical relationships amongst the following monosaccharides I-IV A. I and II are anomers, III and IV are epimersB. I and II are epimers, III and IV are anomersC. I and III are anomers , I and II are epimersD. I and III epimers, II and IV are anomers |
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Answer» Correct Answer - C (I) and (III) are anomers because they have change of configuration only at anomeric carbon. (I) and (II) are epimers because they have change of configuration at a carbon other than anomeric. |
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| 68. |
Which of the following will not show iodoform testA. `CH_(3)-overset(O)overset(||)(C )-CH_(3)`B. `CH_(3)-overset(O)overset(||)(C )-Cl`C. `CH_(3)-overset(O)overset(||)(C )-NH_(2)`D. `CH_(3)-COOH` |
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Answer» Correct Answer - B::C::D Choice (a) is incorrect. `CH_(3)COCH_(3) +I_(2) rarr underset(" Iodoform")(CHI_(3)) darr + CH_(3)COOK` Choice `(b)` is correct `CH_(3)-overset(O)overset(||)C-Cl` does not give iodoform test due to presence of Cl group. The H-atoms on C-atoms will not show acidic behaviour. Choice (c ) is correct `CH_(3)-overset(O)overset(||)C-NH_(2)` does not give iodoform test due to presence of `NH_(2)` is group. The H-atoms on C-atoms will not show acidic behaviour . `CH_(3)COOH` will not give iodoform test. Hence choice (d) is correct. |
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| 69. |
A monocarboxylic acid decolourise `Br_(2) - H_(2)O`, on heating with soda lime derivate of styrene is formed , with neutral `FeCl_(3)` , a buff coloured precipitate is formed . Acid could be :A. B. C. D. |
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Answer» Correct Answer - D |
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| 70. |
An organic compound containing one oxygen gives red colour with cerric ammonium nitrate solution , decolourise alkaline `KMnO_(4)` , respond iodoform test and show geometrical isomerism . It should be :A. `Ph-CH=CH-CH_(2)OH`B. `Ph-CH=CH-overset(OH)overset(|)(CH)-CH_(3)`C. `Ph-CH=CH - underset(O)underset(||)(O)-CH_(3)`D. |
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Answer» Correct Answer - B |
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| 71. |
An organic compound containing one oxygen gives red colour with cerric ammonium nitrate solution , decolourise alkaline `KMnO_(4)` , respond iodoform test and show geometrical isomerism . It should be :A. `Ph-CH=CH-CH_(2)OH`B. `Ph-CH=CH-overset(OH)overset(|)(CH)-CH_(3)`C. `Ph-CH=CH - underset(O)underset(||)(O)-CH_(3)`D. |
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Answer» Correct Answer - B |
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| 72. |
Compound `(X)C_(9)H_(10)O` in inert to `Br_(2)//"CC"l_(4)`. Vigorous oxidation with hot alkaline `KMnO_(4)//ObarH` yields `C_(6)H_(5)COOH` . `(X)` gives precipitate with 2,4,-dinitrophenyl hydrazine. How casn these isomers be distinguished by the usual chemical tests? Following are possible isomers of `X`: (I) `C_(6)H(5)-CH_(2)-CH_(2)-CHO` `CH_(6)H_(5)-underset(CH_(3))underset(|)(CH)-CHO` (III) `C_(6)H_(5)-CH_(2)-overset(O)overset(||)(C)-CH_(3)` (IV) `CH_(6)H_(5)-overset(O)overset(||)(C)-CH_(2)-CH_(3)`A. I give red ppt with Fehling solution and II & III canbe distinguished by iodoform testB. I & II canbe distinguished by simple chemcial methodC. I & II give red ppt. with Fehlilng solution and III & IV can be distinguished by iodoform testD. II give red ppt. Fehling solution and I & IV can be distinguished by iodoform test. |
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Answer» Correct Answer - A::C By the condition of the question. I & IV both compounds do not gie iodoform test ad I & II both are gives similar test |
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| 73. |
An organic compound contain `54%` carbon. It could beA. EthanolB. Dimethyl etherC. diethyl etherD. Acetic acid |
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Answer» Correct Answer - A::B (a) and (b) have molecular formula `C_(2)H_(6)O` `%` of `C = (24)/(46) xx 100 = (2400)/(46) = 52%` |
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| 74. |
An organic compund contains `52%` carbon. If could beA. ethanolB. dimethyl etherC. diethyl etherD. acetic acid |
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Answer» Correct Answer - A::B a and b have molecular formula `C_(2)H_(6)O` % of `C=24/46xx100=2400/46=52%` |
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| 75. |
`CH_(3)-overset(O)overset(||)(C)-C_(2)H_(5)` & `CH_(3)-overset(O)overset(||)(C)`- cannot be sdistinguished byA. 2,4,-DNPB. iodoform reactiionC. `NaHSO_(3)`D. Na metal |
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Answer» Correct Answer - A::B::D (a) is correct as both will give characteristic colour with 2,4-DNP (b) is correct as both with give idoform test (c) is correct as only `CH_(3)COC_(2)H_(5)` will form bisulphite while `CH_()COC(CH_(3))_(3)` will not due to steric hindrance. (d) is correct both will not react with sodium metal. |
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| 76. |
Which of the these can be distinguished by adding `HCl` or `Na_(2)CO_(3)`?A. `R-NH_(2)` and `R-Cl`B. C. `CH_(3)CH_(2)OH` and `CH_(3)underset(OH) underset(|)(CH)CH_(3)`D. `CH_(3)-underset(O) underset(||)(C)-CH_(3)` and `CH_(3)CH_(2)CHO` |
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Answer» Correct Answer - A::B Not solution. |
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| 77. |
Which one of the following reagents is used for detection of unsaturation in alkenesA. `NaOH + CaO`B. Cold dilute alkaline `KMnO_(4)`C. `Cl_(2)//hv`D. `KOH//C_(2)H_(5)OH` |
| Answer» Correct Answer - B | |
| 78. |
In the test of sulphur violet colour of sodium thionitroprusside is formed. What is the formula of sodium thionitroprusside.A. `Na_(2)[Fe(CN)_(5)NO]`B. `Na_(2)[Fe(CN)_(5)NOS]`C. `Na_(4)[Fe(CN)_(5)NOS]`D. `Na_(4)[Fe(CN)_(5)NO]` |
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Answer» Correct Answer - C `Na_(2)SCN+Fe^(+3)[Fe(CN)_(5)NO]toNa_(4)[Fe(CN)_(5)NOS]` |
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| 79. |
Detection of the chlorine is possible without preparing sodium extract inA. B. `ChCl_(3)`C. D. `CH_(2)=CH-CH_(2)Cl` |
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Answer» Correct Answer - D Silver ion can easily pull out chlorine from `CH_(2)=CH-CH_(2)-Cl` because `H_(2)Cl=CH=CH_(2)` is allylic carbocation which is resonance stabilized. |
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| 80. |
A violet colour compound formed in detection of S in a compound isA. `Na_(4)[Fe(CN)_(5)NOS]`B. `Na_(3)[Fe(CN)_(5)NOS]`C. `Na_(2)[Fe(CN)_(5)NOS]`D. `Na_(2)[Fe(CN)_(5)NO]` |
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Answer» Correct Answer - A `underset(" Sodium nitroprusside")(Na_(2)S+Na_(2)[Fe(CN)_(5)CO])rarrunderset(" Violet colour")(Na_(4)[Fe(CN)_(5)NOS])` |
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| 81. |
The percentate of sulphur in the organic, when `0.2595g` of a sulphur containing organic compound in a quantitative analysis by Carius method yielded `0.35g` of barium sulphate isA. `14.52%`B. `16.52%`C. `18.25%`D. `19.52%` |
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Answer» Correct Answer - C Wt. of og. Compound containing sulphur`=0.2595g`, Weight of barium sulphtes `=0.35g` Percentage of sulphur `(32xx "weight of " BaSO_(4))/(233xx"weight of organic compound")xx100` `=(32xx0.35)/(233xx0.2595)xx100=18.52%` |
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| 82. |
`0.2595 g` of an organic substance in a quantitative analysis yielded `0.35 g` of the barium sulphate. The percentage of sulphur in the substance isA. `18.52 g`B. `182.2 g`C. `17.5 g`D. `175.2 g` |
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Answer» Correct Answer - A `%` of `S = 32/233 xx (" w.t of " BaSO_(4))/(" w.t of organic compound") xx 100` `= 32/233 xx (0.35)/(0.2595) xx 100 = 18.52% gm`. |
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| 83. |
A compound that gives a psitive idoform test isA. `CH_(3)-overset(O)overset(||)(C)-COOH`B. `CH_(3)-overset(OH)overset(||)(CH)-COOH`C. `CH_(3)-overset(OH)overset(||)(CH)-CH_(3)`D. `CH_(3)CH_(2)OH` |
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Answer» Correct Answer - A::B::C::D Not solution. |
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| 84. |
If we want to study relative arrangement of atoms in a molecule we studyA. Empirical formulaB. Molecular formulaC. Structural formulaD. None of these |
| Answer» Correct Answer - C | |
| 85. |
Which of the following is the bes scientific method to test the presence of water in a liquidA. Use of anhdrous copper sulphateB. Use of litmus paperC. TasteD. Smell |
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Answer» Correct Answer - A Anhydrous `CuSO_(4)` is used to test presence of water in any liquid because it changes its colour white to blue. |
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