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.
| 51. |
Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence ofA. a vinyl groupB. two ethylenic double bondsC. an isopropyl groupD. an acetylenic triple bond |
| Answer» Correct Answer - A | |
| 52. |
Two compounds (X) and (Y) of the same molecular formula. `C_(4)H_(6)` gave the following reactions: i) Both discharged colour of `Br_(2)` in `C(Cl_(4))`. ii) (X) gives a precipate with ammonicial `AgNO_(3)` and on oxidation gives propanoic acid and `CO_(2)`. iii) (Y) does not give precipitate with ammoniacal `AgNO_(3)` and on oxidation gives oxliac acid and `CO_(2)`. What is the structural formula of (X) and (Y). |
| Answer» (X) is `CH_(3)CH_(2)CH=CH` and (Y) is `H_(2)C=CH-CH=CH_(2)` | |
| 53. |
Acetylene when passed through cuprous chloride in presence of ammonium chloride forms:A. benzeneB. vinyl acetyleneC. allyl chlroideD. allene |
| Answer» Correct Answer - B | |
| 54. |
Acetylene and HCHO react in presence of copper acetylide catalyst to form:A. 1-butyne-1,4-diolB. 2-butyne,1,2-diolC. 2-butyne-1,4-diolD. none of these |
| Answer» Correct Answer - C | |
| 55. |
Acetylene reacts with `HCN` in the presence of `Ba(CN)_(2)` to yield `:`A. 1,1-dicyanoethaneB. 1,2-dicyanoethaneC. vinyl cyanideD. none of these |
| Answer» Correct Answer - C | |
| 56. |
Name the reagent used to bring about the following transformation, but-2-ene to ethanol:A. `K_(2)Cr_(2)O_(7)` in acidic mediumB. `CrO_(2)Cl_(2)//H_(3)O^(+)`C. PCCD. `O_(3)//H_(2)O-Zn` dust |
| Answer» Correct Answer - D | |
| 57. |
Which of these will not react with acetylene?A. NaOHB. Ammoniacal `AgNO_(3)`C. NaD. HCl |
| Answer» Correct Answer - A | |
| 58. |
Consider the following statements, a hydrocarbon of moilecular formula `C_(5)H_(10)` is a: I) mono substituted alkene II) disubstituted alkene III) trisubstitued alkene Which of the following statements are correct?A. I, II and IIIB. I and IIC. II and IIID. I and III |
| Answer» Correct Answer - A | |
| 59. |
Which is the best reagent among the following to convert but-2-yne to trans-but-2-ene?A. `H_(2)//Pd`-charcoalB. `H_(2)//"Raney nickel"`C. `H_(2)//Pd-BaSO_(4)`D. `Na//"liq".NH_(3)` |
| Answer» Correct Answer - D | |
| 60. |
A molecule (X) has (i) four sigma bonds formed by hte overlap of `sp^(2)` and s orbitals, (ii) one sigma bond formed by `sp^(2)` and `sp^(2)` -orbitals nad (iii) on `pi`-bond formed by `p_(z)` and `p_(z)` orbitals. Which of the following is X?A. `C_(2)H_(6)`B. `C_(2)H_(3)Cl`C. `C_(2)H_(2)Cl_(2)`D. `C_(2)H_(4)` |
| Answer» Correct Answer - D | |
| 61. |
The olefin which on ozonolysis gives `CH_(3)CH_(2)CHO` and `CH_(3)CHO` isA. 1-buteneB. 2-buteneC. 1-peneneD. 2-pentene |
| Answer» Correct Answer - D | |
| 62. |
Assertion `: ` Dimethyl sulphide is commonly used for the reduction of an ozonide of compound. Reason`:` It reduces the ozonide giving water soluble dimethyl sulphoxide and excess of it evaporates.A. If both (A) and ( R) are correct and (R ) is correct explanation of (A).B. If both (A) and (R ) are correct and (R ) is not correct explanation of (A).C. If (A) is correct but ( R) is correct.D. If (A) is incorrect but (R ) is correct. |
| Answer» Correct Answer - A | |
| 63. |
An olefin may be converted into alocohol by:A. `B_(2)H_(6)` and `H_(2)O_(2)`B. `LiAIH_(4)`C. alkaline `KMnO_(4)`D. HOCl |
| Answer» Correct Answer - A | |
| 64. |
Ozonolysis products of an olefin are OHC-CHO and OHC-`CH_(2)-CH_(2)-CHO`, the olefin is:A. B. C. D. |
| Answer» Correct Answer - C | |
| 65. |
Upon ozonolysis, molecule of a hydrcarbon produces of ethanal and one molecule of ethane dial. Identify the hydrocarbon.A. 2,4-hexadieneB. 1.4-hexadieneC. 1,3-hexadieneD. 1,4-cyclohexadiene |
| Answer» Correct Answer - A | |
| 66. |
Reaction of HBr with propene in absence of peroxide is a/an:A. electrophilic additionB. electrophilic substitutionC. nucleophilic additionD. nucleophilic substitution |
| Answer» Correct Answer - A | |
| 67. |
Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E. Compound E on furhter treatment with aqueous KOH yields compound F. Compound F isA. B. C. D. |
| Answer» Correct Answer - D | |
| 68. |
The reaction of propene with HBr in presence of peroxide proceeds through the intermediate:A. `H_(3)C-CH^+CH_(3)`B. `H_(3)C-CH^.-CH_(2)Br`C. `H_(3)C-underset(Br)underset(|)(CH)-CH_(2)^.`D. `H_(3)C-CH_(2)-CH_(2)^+` |
| Answer» Correct Answer - B | |
| 69. |
The intermediate during the addition of `HCl` to propene in the presence of peroxide is :A. `CH_(3)CHCH_(2)Cl`B. `CH_(3)CH^+CH_(3)`C. `CH_(3)CH_(2)CH_(2)`D. `CH_(3)CH_(2)CH_(2)` |
| Answer» Correct Answer - B | |
| 70. |
Which of the reagents on reaction with cyclohexanol gives best yield of cyclohexene?A. Conc. `H_(3)PO_(4)`B. Conc. HClC. Con. HBrD. Con. HCl with `ZnCl_(2)` |
| Answer» Correct Answer - A | |
| 71. |
Reaction of one molecule of HBr with one molecule of 1,3-butadiene at `40^(@)`C gives predominantly.A. 3-bromobutene under kinetically controlled conditionB. 1-bromo-2-butene under thermodynamically controlled conditions.C. 3-bromobutene under thermodynamically controlled conditionsD. 1-bromo-2-butene under kinetically controlled conditions. |
| Answer» Correct Answer - B | |
| 72. |
Predict the correct intermediate and product in the following reaction: `H_(3)C-C-=Choverset(H_(2)O,H_(2)SO_(4))underset(HgSO_(4))to"Intermediate" to "Product"`A. B. C. D. |
| Answer» Correct Answer - A | |
| 73. |
In the reactions `HC-=CHoverset((1)NaNH_(2) // liq. NH_(3))underset((2)CH_(3)CH_(2)Br)rarrX` `X overset((1)NaNH_(2) //liq. NH_(3))underset((2)CH_(3)CH_(2)Br)rarrY,X` and `Y` are `:`A. X= 2-butyne, Y=2-hexyneB. X=2-butyne, Y=3-hexyneC. X=1-butyne, Y=2-hexyneD. X=1-butyne, Y=3-hexyne |
| Answer» Correct Answer - D | |
| 74. |
The peroxide effect is observed in case of HBr and not with HF, HCl or HI. Give reason. |
|
Answer» The bond strength order of halogen acid is `HF gt HCL gt HBr gt HI`. HF and HCl have high bond strength and polarity, so homolytic cleavage does not occur easily. In HBr and HI, homolytic clevage occurs readily to produce bromine and iondine free radicals. However, iodine radicals undergo coupling reaction with similar iodine radical to form iodiine `(I^(star)+I^(star) to I_(2))` molecule. As a result radicals are not available for addition on alkenes. Thus, only HBr can provide free radical for addition to alkenes. |
|
| 75. |
Ethylene can be converted into alcohol by treatment of:A. aq. KOHB. Zn/HClC. `H_(2)SO_(4)` as catalystD. moist silver oxide |
| Answer» Correct Answer - C | |
| 76. |
Ethylene is produced by:A. dehydration of acetic acidB. electrolysis of methyl alcoholC. mixing acetic acid and calcium formate.D. Passing `C_(2)H_(5)OH` vapours over hot `Al_(2)O_(3)` |
| Answer» Correct Answer - D | |
| 77. |
When propene is treated with chlorine at `500^(@)`C, allyl chlroide is formed as the main product. The mechanism of the reaction is:A. free radical additionB. free radical substitutionC. electrophilic additionD. electrophilic substitution |
| Answer» Correct Answer - B | |
| 78. |
Propene was oxidised by aqueous `KMnO_(4)` to give a compound (A), Treatment of compound (A) with thionyl chloride gave:A. 1-chloropropanoneB. 2-chloropropanolC. 1,2-dichloropropaneD. 2-chloropropanoic acid |
| Answer» Correct Answer - C | |
| 79. |
Acetylene contains same degrees of unsaturation as:A. B. C. D. |
| Answer» Correct Answer - B | |
| 80. |
Four degree of unsaturation are present in which of the compounds given below?A. But-1-yneB. But-2-yneC. Buta-1,3-dieneD. Toluene |
| Answer» Correct Answer - D | |
| 81. |
One per cent composition of an organic compound A is carbon=`85.71%` and hydrogen `=14.29%`. Its vapour density is 14. Consider the following reaction sequences. `A overset(Cl_(2)//H_(2)O)to(B) overset(KCN//EtOH)underset(H_(3)O^(+))toC,` Identify C.A. `CH_(3)-underset(OH)underset(|)CO_(2)H`B. `HO-CH_(2)-CH_(2)-CO_(2)H`C. `HO-CH_(2)-CO_(2)H`D. `CH_(3)CH_(2)-CO_(2)H` |
| Answer» Correct Answer - B | |
| 82. |
The name of the poisonous gas formed by the interaction of accetylene and arsenci trichloride is:A. phosgeneB. lewisiteC. mustard gasD. westron |
| Answer» Correct Answer - B | |
| 83. |
The most reactive hydrocarbon isA. EheneB. ethyneC. ethaneD. methane |
| Answer» Correct Answer - A | |
| 84. |
Products of the following reaction. `Me_(2)C-CHCH_(3) overset(i. O_(3))underset(ii.(CH_(3))_(2))Sto` ? areA. `Me_(2)CO+CH_(3)CHO`B. `CH_(3)CHO+CH_(3)COOH`C. `Me_(2)CO+CH_(3)COOH`D. `2Me_(2)CO` |
| Answer» Correct Answer - A | |