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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 `C CI_(2) =CHCI` is known as westrosol. Which one of the following statement is wrong regarding this compound ?A. It is obtained by treating westron with `Ca(OH)_(2)`B. It is used as a solventC. It is used in refrigeratorsD. It is used as a degreasing agent |
| Answer» Correct Answer - C | |
| 52. |
When carbon tetrachloride is reduced with Zn and `H_(2)SO_(4)` alcoholic solution it forms:A. `CH_(3)CI`B. `CHCI_(3)`C. `C_(2)H_(5)CI`D. `CI_(2)` |
| Answer» Correct Answer - B | |
| 53. |
`CHI_(3)` is used as a `// ` anA. Antiseptic for woundsB. InsecticideC. PyreneD. Refrigerant |
| Answer» Correct Answer - 1 | |
| 54. |
With conc. Nitric acid the chloroform forms a compound which is used as an :A. anaestheticB. antisepticC. insecticideD. antiknock compound |
| Answer» Correct Answer - C | |
| 55. |
Which one of the following has antiseptic property ?A. DichloromethaneB. TriiodomethaneC. TrifluoromethaneD. Tetrachloromethane |
| Answer» Correct Answer - B | |
| 56. |
Triiodomethane has antiseptic property because ofA. liberation of iodoformB. liberation of free iodineC. formation of phosgene gasD. none of these |
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Answer» Correct Answer - B Triiodomethane (iodoform) has antiseptic property due to the liberation of free liberation of free iodine and not due to iodoform itself. |
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| 57. |
the antiseptic action of `CHI_(3)` is due to :A. iodoform itselfB. liberation of free iodineC. partially due to iodine and partially due to `CHI_(3)` itselfD. none of the above |
| Answer» Correct Answer - B | |
| 58. |
Match the following : (i) `{:((A),"carbon tetrachloride",,1.,"Antiseptic"),((B), "Chloretone",,2.,"Refrigerant"),((C),"Westrosol",,3.,"Chloroform"),((D),"Freon",,4.,"Polymer"),((E),"Iodoform",,5.,"Hypnotic"),((F),"Teflon",,6.,"Pyrene"),((G),"Carbylamine reaction",,7.,"Solvent"):}` (ii) `{:((A),"Acetone",,1.,"Plastic"),((B), "Chloropicrin",,2.,"Gem-dihalide"),((C),"PVC",,3.,"Vic-dihalide"),((D),RCHCI_(2),,4.,"Iodoform test"),((E),CH_(2)CI-CH_(2)CI,,5.,"Grignard reagent"),((F),"RMgX",,6.,CHCI_(3)+HNO_(3)):}` |
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Answer» `(I) (A-6), (B-5),(C -7), (D-2) ,(E-1),(F-4),(G-3)` `(ii) (A-4),(B-6),(C -1),(D-2),(E-3),(F-5).` |
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| 59. |
Why iodoform has appreciable antiseptic property? |
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Answer» When iodoform `(CHI_(3))` comes in contact with Skin, it slowly decomposes to evolve iodine which is responsible for its antiseptic property `underset("Iodoform")(CHI_(3))overset("Contact with skin")tounderset("Antiseptic nature")(I_(2))`. |
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| 60. |
Discuss the role of Lewiis acids in the preparation of aryl bromides and chlorides in the dark. |
| Answer» Lewis acids `(FeCl_(3))` or `FeBr_(3)` help in generating the electrophile `(X^(+))` which is involved in the electrophilic attack on the ring. | |
| 61. |
Which of the following is used as aerosol spry propellant ?A. `CHCl_(3)`B. `C Cl_(4)`C. `CH_(2)Cl_(2)`D. `DDT` |
| Answer» Correct Answer - C | |
| 62. |
(A) Benzyl bromide when kept in acetone water it produces benzyl alcohol. (R) The reaction follows `S_(N^(2))` mechanism.A. If both (A) and (R) are correct and (R) is the correct explanation of (A)B. If both (A) and (R) are correct but (R) is not the correct explanation of (A)C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - C | |
| 63. |
Complete the following chemicals equation `CH_(3)CH_(2)CH=CH_(2)+HBr overset(("peroxide"))to` |
| Answer» `underset("but-1-ene")(CH_(3)CH_(2)CH)=CH_(3)+HB roverset(("peroxide"))tounderset("1-Bromobutane")(CH_(3)CH_(2)CH_(2)CH_(2)Br`. | |
| 64. |
HBr is added to `CH_(3)CH=CH_(2)` in the presence of peroxide. The resultant product, is,A. `C_(2)H_(5)CH_(2)Br`B. `CH_(3)CHBRCH_(3)`C.D. none of these |
| Answer» Correct Answer - A | |
| 65. |
The IUPAC nane of the compound `CH_(3) - CH = CH- CH_(2) Br ` isA. 4- Bromobut -2- eneB. 1-Bromobut -2- eneC. 3-Bromobut -2- eneD. Allyl bromide |
| Answer» Correct Answer - 2 | |
| 66. |
`CH_(2) = CH - NO_(2) + HBr to P, ` The major product P isA. `underset(Br)underset(|)(CH_(2)) -CH_(2)-NO_(2)`B. CH_(3)-underset(Br)underset(|)(CH)-NO_(2)`C. `CH_(2) =underset(Br)underset(|)(C )-NO_(2)`D. `CH_(2) =CH -Br` |
| Answer» Correct Answer - 1 | |
| 67. |
`CH_(3) -CH =CH_(2) + HOBr to P,` The major product P isA. CH_(3)-underset(Br)underset(|)(CH)- underset(OH)underset(|)(CH_(2))`B. CH_(3) -underset(OH)underset(|)(CH) -underset(Br)underset(|)(CH_(2))`C. `underset(Br)underset(|)(CH_(2)) -CH_(2) -underset(OH)underset(|)(CH_(2))`D. `CH_(3)-overset(Br)overset(|)underset(OH)underset(|)(C )-CH_(3)` |
| Answer» Correct Answer - 2 | |
| 68. |
Reaction of HI si easiest withA. `CH_(3)OH`B. `CH_(3)CH_(2)OH`C. `(CH_(3))_(2)CHOH`D. `(CH_(3))_(3)COH` |
| Answer» Correct Answer - D | |
| 69. |
The addition of `HBr` is the easiest withA. `CH_(2)= CH- CI `B. `CI -CH =CH -CI`C. `CH_(3)-CH=CH_(2)`D. `(CH_(3))_(2) C= CH_(2)` |
| Answer» Correct Answer - 4 | |
| 70. |
The position of Br in the compound in `CH_(3)=CHC(Br)(CH_(3))_(2)` can be classified as……..A. AllylB. ArylC. VinylD. Secondary. |
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Answer» Correct Answer - A It is an allyl halide and the position of Br is allylic in nature. |
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| 71. |
`(p-CIC_(6)H_(4))_(2)CHC CI_(3)` is used as a`//` anA. Antiseptic for woundsB. InsecticideC. PyreneD. Refrigerant |
| Answer» Correct Answer - 2 | |
| 72. |
`CF_(2)CI_(2)` is used as an`//` aA. AntisepticB. InsecticideC. AnalgesicD. Refrigerant |
| Answer» Correct Answer - 4 | |
| 73. |
Which of the following compounds yields only one product on monobromination ?A. NeopentaneB. TolueneC. PhenolD. Aniline |
| Answer» Correct Answer - 1 | |
| 74. |
How many monochloro derivatives are possible when 3-methylheptane is subjected to free radical chlorination ? |
| Answer» Correct Answer - 8 | |
| 75. |
In the following monobromination reaction, the number of possible chiral products is |
| Answer» Correct Answer - 5 | |
| 76. |
Which of the following compounds can yield only one monochlorinated product upon free radical chlorination?A. 2,2-DimethylopropaneB. 2-MethylpropaneC. 2-MethybutaneD. n-Butane |
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Answer» Correct Answer - A All the hydrogen atoms in 2, 2-dimethylpropane are equivalent, hence it can form only one monochlorinated product. |
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| 77. |
Assertion: After using `C Cl_(4)` to extinguish fire, the room must be well-ventilated. Reason: Atmospheric oxygen can convert `C Cl_(4)` into poisonous phosgene `(COCl_(2))` gas.A. If both assertion and reason are correct and reason is correct explanation for assertionB. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. if both assertion and reason are incorrect. |
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Answer» Correct Answer - A Reason is the correct explanation for assertion. |
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| 78. |
Assertion: Diastereomers hae different physical properties. Reason: These are non-superimporsable mirror images.A. If both assertion and reason are correct and reason is correct explanation for assertionB. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. if both assertion and reason are incorrect. |
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Answer» Correct Answer - C Diastereomers differ in physical properties because of different configurations. |
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| 79. |
Teflon is a polymer of ,A. ethyleneB. vinyl chlorideC. acetonitrileD. tetrafluoroethene |
| Answer» Correct Answer - D | |
| 80. |
`AgNO_(3)` does not give precipitate with `CHCI_(3)` becauses ,A. `AgNO_(3)`is chemically inertB. `CHCl_(3)` is chemically inertC. `CHCl_(3)` does not ionise in waterD. none of the above |
| Answer» Correct Answer - C | |
| 81. |
for the given reaction `R-CI +NaI overset("Acetone")(to) R-I +NaCI` Which of the following alkyl halides will gives the maximum yield ?A. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-Cl`B. `CH_(3)-CH_(2)-CH_(2)-Cl`C. `C_(6)H_(5)-underset(CH_(3))underset(|)(CH)-Cl`D. `C_(6)H_(5)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-Cl` |
| Answer» Correct Answer - B | |
| 82. |
`RCl+NaI overset("Acetone")rarr R-I+NaCl` This reaction is known asA. Wurtz reactionB. Fittig reactionC. Finkelstein reactionD. Frankland reaction. |
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Answer» Correct Answer - C It is the correct answer. |
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| 83. |
Pheny`1` magesoium bromide reacts with methanol to give:A. a mixture of anisole and `Mg(OH)Br`B. a mixture of benzene and `Mg(OMe)Br`C. a mixture of toluene and `Mg(OH)Br`D. a mixture of phenol and `Mg(Me)Br` |
| Answer» Correct Answer - B | |
| 84. |
`X overset(AgNO_(3))underset(HNO_(3))(to) " Yellow or white ppt "` which of the following connot be XA. B. `(CH_(3))_(3)C Cl`C. D. |
| Answer» Correct Answer - A | |
| 85. |
The major product formed on monobromination `((Br_(2))/(FeBr_(3)))` of the following compound. IsA. B. C. D. |
| Answer» Correct Answer - B | |
| 86. |
What products are formed when the following compounds are treated with `Br_(2)` in the presence of `FeBr_(3)` ? |
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Answer» Correct Answer - B since the `-CH_(3)` groups are ortho and para directing in nature, the correct products are shown in this option. Both the position are readil available for the electrophilse `(Br^(+))`. |
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| 87. |
`C_(6)H_(5)CH_(3) overset(Br_(2)//FeBr_(3))(to)` the reaction is calledA. Nucleophilic substitutionB. Free radical additionC. Electrophilic substitutionD. Free radical substitution |
| Answer» Correct Answer - 3 | |
| 88. |
Complete the following equation: (i). `C_(6)H_(5)N_(2)Cl+Kito` (ii). `H_(2)C=CH_(2)+Br_(2)overset("CCl"_(4))to` |
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Answer» (i). `underset("Benzene diazonium chloride")(C_(6)H_(5)N_(2)Cl+KI to underset("Iodobenzene")(C_(6)H_(5)I+N_(2)+KCl` (ii) `underset("Ethane")(H_(2)C)=CH_(2)+Br_(2)overset(("CCl"_(4)))tounderset("1,2-Dibromoethane")(BrCH_(2)-CH_(2)Br)` |
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| 89. |
On electrolysis an alcoholic solution of sodium chloride gives a sweet smelling liquid (A) which gives carbylamine reaction and condenses with acetone to form hypnotic . What is (A) ? Ginve reactions of its formation. |
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Answer» `NaCI hArr Na^(+) +CI^(-).` At anode `CI_(2)` is discharged and electrolytic solution contains NaOH on electrolysis `CI_(2)` oxidises alcohol to acetaldehyde which is chlorinated to chloral. Chloral on hydrolysis yields chloroform. `C_(2)H_(5)OHoverset(CI_(2))underset([O])(to) CH_(3)CHO overset(CI_(2))(to) C CI_(3)CHOoverset(NaOH)(to)` `underset((A))(CHCI_(3))+HCOONa` |
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| 90. |
Assertion: Ethyl bromide reacts with alcoholic silver cyanide solution to give ethyl carbylamine as the major product. Reason: `CN^(-)` ion is an ambident nucleophile.A. If both assertion and reason are correct and reason is correct explanation for assertionB. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. if both assertion and reason are incorrect. |
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Answer» Correct Answer - A Reason is the correct explanation for assetion. |
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| 91. |
The product of reaction of alcoholic silver acetate and ethyl bromide is,A. methyl acetateB. ethyl acetateC. ethyl methyl etherD. ethyl alcohol |
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Answer» Correct Answer - B `CH_(3) COOAg+ C_(2)H_(5)Br overset(Delta) to CH_(3) CHCOOC_(2)H_(5)+AgBr` |
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| 92. |
Anyl halides are practically inert toward nucleophilic substitution reactions . The reasons for this fact areA. Because C -X bond has partial double bond character due to conjugation bewteen lone pair of X and `pi` electrons of aromatic ring .B. No `S_(N)1` reaction beacuase aryl carbocations are unstableC. No`S_(N)2` reaction because aromatic `pi` electron cloud do not allow backside attack of `Nu^(-)`D. Product obtained through nucleophilic substitution reactions are non aromatic |
| Answer» Correct Answer - (1,2,3) | |
| 93. |
Identify number of reactions that can give nucleophilic aromatic substitution products. |
| Answer» Correct Answer - 4 | |
| 94. |
Which of the following reactions is an example of nucleophilic substitution reaction?A. `RX +Mg to RMgX`B. `RX+KOH to ROH +KX`C. `2RX+ 2Na to R-R +2NaX`D. `RX+H_(2) to RH +HX` |
| Answer» Correct Answer - B | |
| 95. |
`CH_(3) OH overset(PI_(3))(to) (A) overset(KCN)(to) (B) overset(H_(2)O//H)(to) (C )` The compound ( C ) isA. `CH_(3)CN`B. `CH_(3) CH_(2) NH_(2)`C. `CH_(3) COOH`D. `CH_(3) CH_(2) COOH` |
| Answer» Correct Answer - 3 | |
| 96. |
`CH_(3)CI overset(KCN)(to)(A) overset(H^(+)//H_(2)O)(to)(B)` The compound (B ) in above reaction is :A. `CH_(3)NH_(2)`B. `HCOOH`C. `CH_(3)COOH`D. `CH_(3)COCH_(3)` |
| Answer» Correct Answer - C | |
| 97. |
An alkyl halide, RX reacts with KCN to give propane nitrile. RX isA. `C_3H_7Br`B. `C_4H_9Br`C. `C_2H_5Br`D. `C_5H_(11)Br` |
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Answer» Correct Answer - C `C_2H_5Br+KCNtounderset("Propane nitrile")(C_2H_5CN)+KBr` |
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| 98. |
Following is the substitution reaction in which -CN replaces -CI `R-CI +KCN overset(Delta)(to) R -CN +KCI` To obtain propane nitrile R -CI should be:A. chloroethaneB. 1-chloropropaneC. chloromethaneD. 2-choropropane |
| Answer» Correct Answer - A | |
| 99. |
`n`-butane is produced by the monobromination of ethane followed by Wurtz reaction. Calculate the volume of ethane at `NTP` to produce `55 g` n-butane if the bromination takes place with `90%` yield and the Wurtz reaction with `85%` yield. |
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Answer» The reaction involved are as follows `underset(2xx30=60g)(2CH_(3)CH_(3))+Br_(2)tounderset(2xx(29+80)=218g)(2CH_(3)CH_(2)Br)` `2CH_(3)CH_(2)Br+2Natounderset(58g)(CH_(3)CH_(2)CH_(2)CH_(3))+2NaBr` Amount of bromoethane actually formed in the reaction `=((218g)xx90)/(100)=196*2g` calculation of the amount of n-butane actually formed from the available data 218 g of bromoethane are expected to form n-butane =58g `196*2g` g of bromoethane are expected to form n-butane `=((58g))/((218g))xx(196*2g)=52*2g` But since the yield of n-butane is only 85 percent therefore, the amount of n-butane actually formed in the wurtz reaction `=((52*2g)xx85)/(100)=44*37g` Calculation of volume of ethane required at NTP 58g of n-butane are produced from ethane `=((60g))/((58g))xx(44*37g)=45*9g` Now, 30 g of ethane at N.T.P. correspond to `22*4L` `45*9g` of ethane at N.T.P. correspond to `=(22*4Lxx(45.9g))/((30g))=34*27L` |
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| 100. |
(a). Write the equations for the steps in `S_(N^(1))` mechanism of the conversion of tert-butyl bromide into tert-bytyl alcohol. (b). Explain fittig reaction. (c). Name the reagent used in the dehydrohalogenation of haloalkans. |
| Answer» (c). Alcoholic KOH is used. | |