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. |
`C_(2)H_(5)CI+KCNrarrX overset("Hydrolysis") rarr Y. Xand Y` areA. `C_(2)H_(6) and C_(2)H_(5)CN`B. `C_(2)H_(5)CN and C_(2)H_(6)`C. `C_(2)H_(5)CN and C_(2)H_(5)CH_(2)NH_(2)`D. `C_(2)H_(5)CN and C_(2)H_(5)CO OH` |
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Answer» Correct Answer - D `C_(2)H_(5)Cl+KCN to underset("Ethyl cyanide (X)")(C_(2)H_(5)CN)overset("Hydrolysis")tounderset("Propanoicacid (Y)")(C_(2)H_(5)COOH)` |
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| 52. |
The compound which contains all the four `1^(@),2^(@),3^(@) and 4^(@)` carbon atoms isA. 2,3-dimethyl pentaneB. 3-chloro-2,3-dimethylpentaneC. 2,3,4-trimethylpentaneD. 3,3-dimethylpentane |
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Answer» Correct Answer - B `underset("3-chloro-2,3-dimethylpentane")(overset(1^(@))(C)H_(3)-underset(3^(@))overset(.^(1^(@))CH_(3))overset(|)(C)H-underset(Cl)underset(4^(@)|)overset(.^(1^(@))CH_(3))overset(|)(C)-overset(2^(@))(CH_(2))-overset(1^(@))(CH_(3))` |
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| 53. |
The compound added to prevent chloroform to form phosgene gas isA. `C_(2)H_(5)OH`B. `CH_(3)CO OH`C. `CH_(3)COCH_(3)`D. `CH_(3)OH` |
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Answer» Correct Answer - A Because it float over chloroform and prevent its oxidation. |
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| 54. |
`2CHCI_(3) +O_(2) overset(X)rarr2COCI_(2) + 2HCI` in the above reaction `X` stands for .A. An oxidantB. A reductantC. Lighht and airD. None of these |
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Answer» Correct Answer - C `2CHCl_(3)+O_(2)underset(air)overset(light)tounderset("Phosgene")(2COCl_(2))+2HCl` |
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| 55. |
Phosgene is the common name forA. `CO_(2)` and `PH_(3)`B. Phosphoryl chlorideC. Carbonyl chlorideD. Carbon tetrachloride |
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Answer» Correct Answer - C `COCl_(2)` carbonyl chloride is commonly called as phosgene. |
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| 56. |
The total number of stereoisomeric forms of `C_(6)H_(6)Cl_(6)` known isA. 6B. 7C. 8D. None of these |
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Answer» Correct Answer - C `C_(6)H_(6)Cl_(6)` has 8 stereoisomer. |
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| 57. |
Which of the following is a primary halide ?A. Isopropyl iodideB. Secondary butyl ioidideC. Tertiary butyl bromineD. Neo hexyl chloride |
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Answer» Correct Answer - D Neohexyl chloride is a primary halide as in it Cl-atom is attached to a primary carbon `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-CH_(2)Cl` |
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| 58. |
Iodofrom heated with `Ag` powder to fromA. AcetyleneB. EthyleneC. MethaneD. Ethane |
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Answer» Correct Answer - A `CHI_(3)+6Ag+I_(3)CH to underset("acetylene")(CH-=CH)+6AgI` |
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| 59. |
Which of the following would be produced when acetylene reacts with HClA. `CH_(3)CH_(2)Cl`B. `CH_(3)CHCl_(2)`C. `CHCl=CHCl`D. `CH_(2)=CHCl` |
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Answer» Correct Answer - B `CH-=CH+HCl toCH_(2)=CHCl overset(+HCl)toCH_(2)CHCl_(2)` |
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| 60. |
`Xoverset(PCl_(5))(rarr)C_(2)H_(5)Cl,Yoverset(PCl_(5))(rarr)CH_(3)COCl`, X and Y are `:`A. `(C_(2)H_(5))_(2)O` and `CH_(3)CO_(2)H`B. `C_(2)H_(5)I and C_(2)H_(5)CHO`C. `C_(2)H_(5)OH and CH_(3)CO_(2)H`D. `C_(2)H_(5)OH and C_(2)H_(5)CHO` |
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Answer» Correct Answer - C `underset(X)(C_(2)H_(5)OH)overset(PCl_(5))toC_(2)H_(5)Cl` `underset(Y)(CH_(3)COOH)overset(PCl_(5))CH_(3)COCl` |
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| 61. |
Acetone reacts with `I_(2)` in presence of `NaOH` to fromA. `C_(2)H_(5)I`B. `C_(2)H_(4)I_(2)`C. `CHI_(3)`D. `CH_(3)I` |
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Answer» Correct Answer - C `CH_(3)COCH_(3)+3I_(2)+4NaOHtoCHI_(3)+3Na+CH_(3)COONa+3H_(2)O` |
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| 62. |
Which of the following is the correct method of preparation of methyl fluorideA. `CH_(4)+Hfto`B. `CH_(3)OH+Hfto`C. `CH_(4)+F_(2)to`D. `CH_(3)Br+AgFto` |
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Answer» Correct Answer - D Fluoroalkanes are difficult to prepare directly. These are prepared by treating alkyl chloride or bromide with salts such as `Hg_(2)F_(2),AgF`. This reaction is called Swarts reaction. `CH_(3)Br+AgFtoCH_(3)F+AgBr.` |
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| 63. |
The addition of `Br_(2)` to `Z-2`-butane givesA. (R,R)-2,3-dibromo butane onlyB. (S-S)-2,3-dibromo butane onlyC. (R,S)-2,3-dibromo butane onlyD. A mixture of (R R) and (S S)-2,3-dibromo butane (50%:50%) |
| Answer» Correct Answer - D | |
| 64. |
Silver acetate`+Br_(2)overset(CS_(2))to`. The main product of this reaction isA. `CH_(3)-Br`B. `CH_(3)COI`C. `CH_(3)CO OH`D. None of these |
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Answer» Correct Answer - A `CH_(3)COOAg+Br_(2)overset(CS_(2))toCH_(3)Br+AgBr+CO_(2)` |
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| 65. |
Freon (dichlorodifluoro methane) is used .A. As local anaestheticB. For dissolving impurities in metallurgical processC. In refrigeratorD. In printin inductry |
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Answer» Correct Answer - C Freon `(C Cl_(2) F_(2))` is an odourless, non-corrosive, non toxic gas which is stable even at high temperature and pressure. It has low b.p. low specific heat and can be easily liquified by appliying pressure at room temperature. It is therefore, widely used as refrigerant (cooling agent) in refrigerators and air conditioners. |
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| 66. |
Which of these can be used as moth repellantA. Benzene hexachlorideB. Benzal chlorideC. HexachloroethaneD. Tetrachloroethane |
| Answer» Correct Answer - C | |
| 67. |
Which of the following is known as freon which is used as a refrigerant ? .A. `C Cl_(2) F_(2)`B. `CHCl_(3)`C. `CH_(2)F_(2)`D. `CF_(4)` |
| Answer» Correct Answer - A | |
| 68. |
Which one of the following compounds does not react with bromineA. EthylamineB. PropeneC. PhenolD. Chloroform |
| Answer» Correct Answer - D | |
| 69. |
Statement-I: Nucleophilic substitution reaction on an optically active alkyl halide gives a mixture of enantiomers. Because Statement-II: The reaction occurs by `S_(N^(1))` mechanism.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 reason 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 - A In `S_(N^(1))` mechanism, racemization takes place, which is due to inverting nucleophilic displacement of halogen atom from the alkyl halide by the halide in solution. |
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| 70. |
Assertion: Aryl halides undergoes nucleophilic substitution with ease Reason The carbon halogen bond in aryl halides has partial double bond character .A. Both (S) and (E) are true and (E) is the correct explanation of (S)B. Both (S) and (E) are true, but (E) is not the correctC. (S) is true but (E) is trueD. (S) is false but (E) is true |
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Answer» Correct Answer - D Statement is false but explanation is true |
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| 71. |
Aryl halide is less reactive than alkyl halide towards nucleophilic substitution becauseA. Less stable carbonum ionB. Due to large C-Cl bond energyC. Inductive effectD. Resonance stabilization and `sp^(2)`-hybridisation of C attached to halide |
| Answer» Correct Answer - D | |
| 72. |
Chloroform with zinc dust in water givesA. `CH_(4)`B. ChloropicrinC. `C Cl_(4)`D. `CH_(2)Cl_(2)` |
| Answer» Correct Answer - A | |
| 73. |
Which one of the following compounds cannot be used for the preparation of Grignard reagentA. `C_(2)H_(5)Br`B. `HO-CH_(2)CH_(2)Cl`C. `C_(6)H_(5)CH_(2)Cl`D. `CH_(2)=CH-CH_(2)Cl` |
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Answer» Correct Answer - B Grignard reagent cannot be prepared from a compound which consist in addition to halogen, some reactive group such as -OH because it will react rapidly with the grignard reagent. |
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| 74. |
Aryl halides do not undergo uncleophilic substitution reactions under ordinary conditions because (1) Approach of nucleophile is retarded (2) Carbon carrying halogen atom is `sp^(3)` hybridised (3) The substrate molecule is destabilised due to resonance (4) Partial double bond character between carbon and halogenA. 2 and 4 onlyB. 1 and 4 onlyC. 2 and 3 onlyD. 2,3 and 4 only |
| Answer» Correct Answer - B | |
| 75. |
The order of rate of hydrolysis of alkyl halides `1^(@),2^(@),3^(@)` and `CH_(3)X` by the `S_(N^(2))` pathway is :A. `1^(@)gt2^(@)gt3^(@)gtCH_(3)X`B. `CH_(3)Xgt3^(@)gt2^(@)gt1^(@)`C. `CH_(3)Xgt1^(@)gt2^(@)gt3^(@)`D. `3^(@)gt2^(@)gt1^(@)gtCH_(3)X` |
| Answer» Correct Answer - C | |
| 76. |
The general formulafor alkyl halides isA. `C_(n)H_(2n+1)X`B. `C_(n)H_(2n+2)X`C. `C_(n)H_(n+1)X`D. `C_(n)H_(2n)X` |
| Answer» Correct Answer - A | |
| 77. |
Which of the following reaction`(s)` can be used for the preparation of alkyl halides? (I) `CH_(3)CH_(2)OH+HCloverset(anhy.ZnCl_(2))(rarr)` (II) `CH_(3)CH_(2)OH+HClrarr` (III) `(CH_(3))_(3)COH+HClrarr` (IV) `(CH_(3))_(2)CHOH+HCloverset(anhy.ZnCl_(2))(rarr)`A. A,C and D onlyB. A and B onlyC. D onlyD. C and D only |
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Answer» Correct Answer - A Lucas reagent in A & D while `SN^(1)` in C. |
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| 78. |
Which will undergo `S_(N^(2))` reaction fasterA. B. C. D. |
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Answer» Correct Answer - C Orderof `S_(N^(2))` reactivity is `1^(@) gt 2^(@) gt 3^(@)` |
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| 79. |
The compound that does not undergo hydrolysis by `S_(N^(1))` mechanism is :A. `CH_(2)=CHCH_(2)Cl`B. `C_(6)H_(5)Cl`C. `C_(6)H_(5)CH_(2)Cl`D. `C_(6)H_(5)CH(CH_(3))Cl` |
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Answer» Correct Answer - B Aryl halides (e.g. `C_(6)H_(5)Cl`)do not hydrolysed by `S_(N^(1))` mechanism under ordinary conditions. |
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| 80. |
Why is chloroform put into dark coloured bottlesA. To prevent evaporationB. To prevent from moistureC. To prevent in from oxidation to form phosgeneD. To prevent its reaction with glass |
| Answer» Correct Answer - C | |
| 81. |
Which isomer of cyclohexane hexachloride is a very strong insecticideA. `alpha`B. `beta`C. `gamma`D. `delta` |
| Answer» Correct Answer - C | |