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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. |
Which one of the following compounds does not form an ozonide?A. EthaneB. PropyneC. PropeneD. Propane |
| Answer» Correct Answer - D | |
| 52. |
Solid state of methane isA. Molecular solidB. Ionic solidC. Covalent solidD. Not possible to form |
| Answer» Correct Answer - A | |
| 53. |
Raney nickel used as a catalyst in hydrogen is obtained byA. heating nickel tetracarbonylB. griding solid nickelC. treating nickel-aluminum alloy with dilute `NaOH`D. treating nickel-aluminium alloy with dillute `HCl` |
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Answer» Correct Answer - C An alloy containing equal amounts of `Ni` and `Al` is digested with sodium hydroxide. The `Al` is dissolved away and the residual very finely divided `Ni` is washed and stored under water, ethanol or any other suitable liquid. |
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| 54. |
Which liberate methane gas on treatment with water?A. Silicon carbideB. Calcium carbideC. Aluminum carbideD. Iron carbide |
| Answer» Correct Answer - C | |
| 55. |
Stream reforming of methane is used for the industrial preparation ofA. `O_(2)`B. `H_(2)`C. `H_(2)O`D. `H_(2)O_(2)` |
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Answer» Correct Answer - B Methane reacts with steam at `800-850^(@)C` in the presence of `Ni` catalyst forming carbon monoxide and hydrogen. `CH_(4)+H_(2)Ounderset(Ni)overset(850^(@))rarrCO+3H_(2)` |
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| 56. |
Which of the following reactions of methane is incomplete combustion:A. `2CH_4+O_2underset(100atm)overset(Cu//523K)(to)2CH_3OH`B. `CH_4+O_2 overset(MO_2O_3)(to)HCHO+H_2O`C. `CH_4+O_2 to C(s) + 2H_2O(l)`D. `CH_4+2O_2 to CO_2(g) + 2H_2O(l)` |
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Answer» Correct Answer - C The incomplete combustion of methane yield C and `H_2O` |
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| 57. |
Arrange the following in decreasing order of their boiling points. (A). N-butane (B). 2-methylbutane (C). N-pentane (D). 2,2-dimethylpropaneA. `AgtBgtCgtD`B. `BgtCgtDgtA`C. `DgtCgtBgtA`D. `CgtBgtDgtA` |
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Answer» Correct Answer - D As the number of carbon atom increases, boiling point increases. Boiling point decreases with branching. 2,2-Dimethyl propane,- `underset(("b.pt=282.5"))(H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3))` n-pentane- `underset((b.pt=309.1K))(H_(3)C-CH_(2)-CH_(2)-CH_(2)-CH_(3))` 2-methyl butane- `underset((b.pt=301K))(H_(3)C-H_(2)C-Hunderset(CH_(3))underset(|)(C)-CH_(3))` n-butane- `underset(("4 carbon atoms with no braching"))underset((b.pt=273K))(H_(3)C-H_(2)C-CH_(2)-CH_(3))` |
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| 58. |
Alkanes can be prepared by the reduction of alkyl halides (preferably bromides and iodides). In one of the methods, reaction is carried out by dissolving metals such as (i) `Zn` and dil. `HCl` (ii) `Zn` and `CH_3)COOH` (iii) `Zn` and `NaOH` (iv) `Zn-Cu` or couple and alcoholA. (i), (ii)B. (iii), (iv)C. (i), (ii), (iii)D. (i), (ii), (iii), (iv) |
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Answer» Correct Answer - D The metal `Zn` can be dissolved in any of these solvents. The function of metal is to provide electrons while the fundtion of solvent is to provide `H^(+)` ions. |
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| 59. |
Alkyl iodides may be reduced to the corresponding alkanes by heating with cincentrated hyriodic acid at `150^(@)C` in the presence ofA. balck `P`B. white `P`C. yellow `P`D. red `P` |
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Answer» Correct Answer - D `RI+HI underset(150^(@)C)overset(Red P)rarrR-H+I_(2)` |
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| 60. |
Which reagent is suitable for the preparation of formaldehyde from MethaneA. `Mo_(2)O_(3)//D`B. `Cu//523K`C. `(CH_(3)COO)_(2)Mn`D. all the above |
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Answer» Correct Answer - A `CH_(4)+O_(2)underset(Delta)overset(Mo_(2)O_(3))toHCHO` |
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| 61. |
Write the structural formulas for each of the following alkanes: (a) `n`-Butane (b) Isobutane (c ) Neopentane Strategy: The prefix `n` is used for any alkane (no matter how large) in which `C` atoms form a continuos chain with no branching. In an isoalkane of six carbons of fewer, all carbons except one form a continous chain and that one `C` atom is attached to the next-to-end carbon. Neoalkane is characterized by the presence of a quaternary `C` atom. |
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Answer» `underset(n-"Butane")(CH_(3)CH_(2)CH_(2)CH_(3)), underset("Isobutane")underset(CH_(3))underset(|)(CH_(3)CHCH_(3)), underset("Neopentane")underset(CH_(3))underset(|)overset(CH_(3))overset(|)(CH_(3)C CH_(3))` An alkyl group is the structure remaining after one `H` is removed from an alkane.This group which constantly appears as the structural unit of alkanes is named simply by dropping-ane from the name of the corresponding alkane and replacing it by `-yl`. The general formula for an alkyl group is `C_(n)H_(2n+1)` Since it contains one less `H` atom than the parent alkane `C_(n)H_(2n+2)` |
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| 62. |
Which of the following reactions has Zero activation energy?A. `CH_(4)+Cl^(*)to overset(*)(C)H_(3)+HCl`B. `Cl+Cloverset(hv)to2Cl^(*)`C. `CH_(3)^(*)+CH_(3)^(*)toCH_(3)-CH_(3)`D. `CH_(3)^(*)+Cl-CltoCH_(3)-Cl+Cl^(*)` |
| Answer» Correct Answer - C | |
| 63. |
Match the hydrocarbons in column I with the boiling points given in column II. `{:("Column I","Column II"),((i)." n-Pentane",(a)." 282.5 K"),((ii)."iso-Pentane",(b)." 309 K"),((iii)." neo-Pentane",(c)." 301 K"):}` |
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Answer» Correct Answer - A::B::C Surface area `alpha`. B.pts. |
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| 64. |
Which of the following iodides is commonly used for the preparation of `Gridgnard reagent?A. `CH_(3)I`B. `CH_(3)CH_(2)I`C. `CH_(3)CH_(2)CH_(2)I`D. `CH_(3)CH_(2)CH_(2)I` |
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Answer» Correct Answer - A The formation of a `GR` becomes increasingly difficult as the number of `C` atoms in the alkyl group increases, i.e., the ease of formation of `GR is CH_(3)I gt CH_(3)CH_(2)I gt CH_(3)CH_(2) gt CH_(2)I gt CH_(3)CH_(2)CH_(2)CH_(2)I`. |
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| 65. |
Which of the following is the best reagent to convert `t`-butyl chloride to isobutane?A. `HI//redP`B. `Ph_(3)SnH`C. `Zn-Cu//C_(2)H_(5)OH`D. `LiAlH_(4)` |
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Answer» Correct Answer - B `TPH` (triphenyltin hydride) is able to reduce all kinds of alkyl halides. |
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| 66. |
Which of the following reactions is not feasible?A. `(CH_(3)CH_(2))_(2)CuLi+CH_(3)CH_(2)C(CH_(3))_(2)Brrarr`B. `[(CH_(3))_(3)C]_(2)CuLi+CH_(3)CH_(2)CH_(2)Brrarr`C. `[CH_(3)CH_(2)C(CH_(3))_(2)]_(2)CuLi+CH_(3)CH_(2)Brrarr`D. `[(CH_(3))_(2)CH]_(2)CuLi+(CH_(3))_(2)CHCH_(2)Brrarr` |
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Answer» Correct Answer - A Not feasible because the alkyl halide which reacts with lithium dialkycuprate must be methyl halide, primary halidie `(RCH_(2)X)` or secondary `(R_(2)CHX)` halide. Halide in the first reaction is a tertiary halide. |
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| 67. |
The combustion of one mole of propane, `C_3H_8`,produces how many moles of `H_2O`?A. 2B. 3C. 4D. 5 |
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Answer» Correct Answer - C `C_3H_8+5(O)to3CO_2+4H_2O` |
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| 68. |
Ethylene from ethyl bormide is obtained by treating it withA. HydrogenB. Alcoholic caustic potashC. Aqueous caustic potashD. Aqueous caustic soda |
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Answer» Correct Answer - B `C_2H_5Br+aI.KOHoverset("boil")toC_2H_4+KBr+H_2O` |
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| 69. |
Which of the following halides is the best to prepare Grignard reagent?A. `RF`B. `RCI`C. `RBr`D. `RI` |
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Answer» Correct Answer - D The order of reactivity of halides with magnesium is `RI gt RBr gt RCI gt RF`. Very few organomagnesium fluorides have been prepared. |
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| 70. |
Which of the following is not obtained when propyl chloride and methyl chloride react with sodium in dry ether?A. `C_(2)H_(6)`B. `C_(4)H_(10)`C. `C_(3)H_(8)`D. `C_(4)H_(14)` |
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Answer» Correct Answer - C Crossed Wurtz reaction |
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| 71. |
The method of estimation of active `H` atoms in a compound by reaction with excess of `CH_(3)MgI` is known asA. Victor-Meyer methodB. Zeisel methodC. Heigsenberg methodD. Zerewitinoff method |
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Answer» Correct Answer - D `CH_(3)MgI+underset(1mol)(HZ)rarrunderset(1 mol)(CH_(4))+ZMgI` |
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| 72. |
The ratio of products, 1-chloropropane to 2-chloropropane respectively formed in the chlorination of propane if all the hdrogens are abstracted at equal rates isA. `50:50`B. `25:75`C. `75:25`D. `12.5:87.5` |
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Answer» Correct Answer - C `CH_(3)-CH_(2)-CH_(3)` `6xx1=6,2xx1=2` `100x6//8=75,100xx2//8=25` |
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| 73. |
Grignard reagent is an organometallic compounds in which….. Metal is directly bonded to `C` atom.A. `Zn`B. `Mg`C. `Cd`D. `Hg` |
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Answer» Correct Answer - C Grignard reagent is alkylmagnesium halide, `RMgX`. |
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| 74. |
When Grignard reagent `(CH_3MgBr)` is treated with water, we getA. EthaneB. Ethyl alcoholC. Methyl alcoholD. Methane |
| Answer» Correct Answer - D | |
| 75. |
Which of the following Grignard reagents is commonly used for the estimation of active hydrogen in a compound?A. `C_(6)H_(5)MgI`B. `C_(6)H_(11)MgI`C. `CH_(3)I`D. `C_(2)H_(5)MgI` |
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Answer» Correct Answer - C An active `H` atom is one which is joined to an electronegative atoms such as `O,N or S`. When such compounds react with a `GR`, the alkyl group is converted into the alkane: `underset(1 mol)(RMgX)overset(HZ)rarrunderset(1 mol)(RH)` Since reactions with compounds containing an active `H` atom result in the quantitative yield of hydrocarbon, this type of reaction is valuable for the determination of the number of active `H` atoms in a compound. The process is known as the Zerewitinoff active hydrogen determination. Methyl magnesium iodide is normally used as the `GR`. The methane gas which is liberated is measured ( by volume). According to the equation given earlier, one molecule of `CH_(4)` is equivalent to one active `H` atom. |
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| 76. |
Correct IUPAC name of alkane obtained in the reaciton of 2-chloropropane + sodium and dry etherA. 2,3-DimethylbutaneB. 2-IsopropylpropaneC. n-HexaneD. None of these |
| Answer» Correct Answer - A | |
| 77. |
In the Frankland reaction, when an alkyl halide (particularly iodide) is heated with……powder, higher alkane is formed.A. `Zn`B. `Ag`C. `Mg`D. `Cu` |
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Answer» Correct Answer - A `R+I+Zn+I-RrarrZnI_(2)+R-R` |
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| 78. |
The Wurtz reaction is best suited for the preparation ofA. symmetrical odd carbon alkanesB. symmetrical even carbon alkanesC. unsymmetrical odd carbon alkanesD. unsymmetrical even carbon alkanes |
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Answer» Correct Answer - B The best yield on an alkane is obtained when the alkane contains an even number of `C` atoms and it symetrical. In other cases, the yield is reduced due to more side products. |
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| 79. |
In which case butane is formed?A. `2C_2H_5-CI+Na`B. `C_2H_5COOH+Na_2CO_3`C. `CH_2=CH-CH_3+H_2SO_4`D. `CH_2=CH_2+HBr` |
| Answer» Correct Answer - A | |
| 80. |
An alkane forms isomers if the number of carbon atoms isA. `ge1`B. `ge2`C. `ge3`D. `ge4` |
| Answer» Correct Answer - D | |
| 81. |
Ethyl iodide is treated first with lithium in dry ether and then with cuprous iodide `(Cul)` and finally with `n`-Proply iodide. The expected alkane isA. ethaneB. pentaneC. propaneD. butane |
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Answer» Correct Answer - B It is the Corey-House synthesis. `CH_(3)CH_(2)Iunderset(Et_(2)O)overset(Li)rarrCH_(3)Lioverset(Cu l)rarr(CH_(3)CH_(2))_(2)CuLioverset(CH_(3)CH_(2)CH_(2)I)rarrCH_(3)underset(Pent a n e)((CH_(2))_(3)CH_(3)` |
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| 82. |
`underset(A)(C_5H_11Br) underset((ii)D_2O)overset((i)Mg//ether)(to)underset(B)(C_5H_11D` only one type of B is formed . Thus , A isA. `CH_3CH_2undersetoverset(|)(Br)( C)HCH_2CH_3`B. `CH_2undersetoverset(|)(Br)(C )Hundersetoverset(|)(CH_3)(C )HCH_3`C. `CH_3-undersetoverset(|)(CH_3)oversetunderset(|)(CH_3)(C)-CH_2Br`D. `CH_3CH_2undersetoverset(|)(CH_3)(C )HCH_2Br` |
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Answer» Correct Answer - C If one type of B is formed , it means A is also of one type . Thus , `underset((A))((CH_(3))_(3))C CHBr overset(Mg) to underset((B)) underset((CH_(3))_(3)C CH_(2)D) underset(darrD_(2)O) ((CH_(3))_(3)C C_(2)MgBr)` |
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| 83. |
The reagent used for the conversion `CH_3CH_2COOH to CH_3CH_2CH_3` , isA. `LiAlH_4`B. SodalimeC. Red P and concentrated HID. Amaigamated zinc and concentrated HCl |
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Answer» Correct Answer - C Only red P and conc. HI convert - COOH group to `-CH_3` |
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| 84. |
Decarboxylation of isobutyric acid gives n-alkane but reduction of isobutyric and with phosphorous and hydrogen iodide givesA. n-PropaneB. IsobutaneC. n-ButaneD. none of these |
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Answer» Correct Answer - B `CH_3-underset(underset(H)|)overset(overset(CH_3)|)C-overset(overset(O)||)C-OH+6[H]underset(P_4)overset("Reduction")to` `CH_3-underset(underset(H)|)overset(overset(CH_3)|)C-CH_3+2H_2O` |
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| 85. |
Reduction of `CH_3COCH_3` producesA. AldehydeB. AcidC. PropaneD. Ketone |
| Answer» Correct Answer - C | |
| 86. |
Which is not correct in case of isopentane?A. There are three `-CH_3` groups in itB. There is one `-CH_2` group in itC. There is one `-CH` group in itD. One hydrogen atom is not bonded to carbon in it |
| Answer» Correct Answer - A | |
| 87. |
A mixture of ethyl iodide and n-propyl iodide is subjected to Wurtz reaction. The hydrocarbon that will not be formed isA. ButaneB. PropaneC. PentaneD. Hexane |
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Answer» Correct Answer - B Propane will not formed as in Wurtz reaction two molecules of each reacting species combine and also both the reacting species combine with the removal fo Na.X |
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| 88. |
Which hydrocarbon is formed by the action of sodium on ethyl iodide?A. MethaneB. EthaneC. EthyleneD. n-Butane |
| Answer» Correct Answer - D | |
| 89. |
Which of the following hydrocarbons is not formed when a mixture of ethyliodide and `n`-Propyliodide is subjected to the Wurtz reaction?A. `n`-PropaneB. `n`-ButaneC. `n`-PentaneD. `n`-Hexane |
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Answer» Correct Answer - A `CH_(3)CH_(2)I+2Na+ICH_(2)CH_(3)rarrCH_(3)underset(n-Buta n e)(CH_(2))CH_(2)CH_(3)+2NaI` `CH_(3)CH_(2)CH_(2)I+2Na+ICH_(2)CH_(2)CH_(3)rarrCH_(3)CH_(2)underset(n-Hexan e)(CH_(2)CH_(2))CH_(3)+2Nal` `CH_(3)CH_(2)I+2Na+ICH_(2)CH_(2)rarrCH_(3)CH_(2)underset(n-Penta n e)(CH_(2)CH_(2))CH_(3)+2Na` |
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| 90. |
Wurtz reaction involves the comdensation of two molecules of alkyl halides in the presence of sodium and dry ether `R-X+2Na+R-Xoverset("dry ether")toR-R+2NaX` In this reaction small amount of alkene is also formed as by product. `CH_(3)CH_(2)Br+CH_(3)CH_(2)Broverset("Na/dry ether")toCH_(3)-CH_(2)-CH_(2)-CH_(3)+underset("By-product")ubrace(CH_(2)=CH_(2)+CH_(3)-CH_(3))` Tertiary alkyl halides do not give wurtz reaction. Frankland reaction is similar but has certain advantages over wurtz reaction. it is useful in the synthesis of symmetrical alkanes. frankland reaction is shown by primary, Secondary as well as tertiary alkyl halide. Q. A mixture of ethyl iodide and methyl iodide is subjected to wurtz reaction. the product that will not formed isA. EthaneB. ButaneC. PropaneD. Pentane |
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Answer» Correct Answer - D |
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| 91. |
Wurtz reaction involves the comdensation of two molecules of alkyl halides in the presence of sodium and dry ether `R-X+2Na+R-Xoverset("dry ether")toR-R+2NaX` In this reaction small amount of alkene is also formed as by product. `CH_(3)CH_(2)Br+CH_(3)CH_(2)Broverset("Na/dry ether")toCH_(3)-CH_(2)-CH_(2)-CH_(3)+underset("By-product")ubrace(CH_(2)=CH_(2)+CH_(3)-CH_(3))` Tertiary alkyl halides do not give wurtz reaction. Frankland reaction is similar but has certain advantages over wurtz reaction. it is useful in the synthesis of symmetrical alkanes. frankland reaction is shown by primary, Secondary as well as tertiary alkyl halide. Q. Which among the followng compound will give wurtz reaction with good yield ?A. `CH_(2)=CH-Br`B. `ph-Br`C. `CH_(2)=CH-CH_(2)-Br`D. `CH_(3)-CH=CH-Br` |
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Answer» Correct Answer - C |
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| 92. |
Wurtz reaction involves the comdensation of two molecules of alkyl halides in the presence of sodium and dry ether `R-X+2Na+R-Xoverset("dry ether")toR-R+2NaX` In this reaction small amount of alkene is also formed as by product. `CH_(3)CH_(2)Br+CH_(3)CH_(2)Broverset("Na/dry ether")toCH_(3)-CH_(2)-CH_(2)-CH_(3)+underset("By-product")ubrace(CH_(2)=CH_(2)+CH_(3)-CH_(3))` Tertiary alkyl halides do not give wurtz reaction. Frankland reaction is similar but has certain advantages over wurtz reaction. it is useful in the synthesis of symmetrical alkanes. frankland reaction is shown by primary, Secondary as well as tertiary alkyl halide. Q. Among all isomers of hexane which of the following isomer cannot be obtained in a good yield by wurtz reaction (from symmetrical alkyl halides)? 1. n-hexane 2. iso hexane 3. 2,3-dimethyl butane 4. neo hexaneA. 1,4B. 2,4C. 1,3D. 3,4 |
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Answer» Correct Answer - B |
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| 93. |
Wet ether is not used as a solvent in Wurtz reaction because the water present in it,A. Hydrolysis `RXtoROH`B. Reduces `RX to RH`C. Oxidise `RXtoRH`D. Reacts with R-R |
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Answer» Correct Answer - A wet ether makes `RXtoROH` |
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| 94. |
Both `CH_4 " and " C_2H_6` can be prepared in one step by the reaction ofA. `CH_3Br`B. `CH_3CH_2OH`C. `CH_3OH`D. `CH_3COCH_3` |
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Answer» Correct Answer - A `CH_3Br overset(Na//ether)(to) CH_3 - CH_3 overset(LiAlH_4)(to) CH_4` |
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| 95. |
Select the correct statement (s)A. In the chlorination of n-butane , 2-chlorobutane is formed faster than 1-chlorobutaneB. Bromine is less reactive towards alkanes in general than chlorine but bromine is more selective at the site of attck when it does react.C. Reactivity of halogens forward alkanes is in order `F_1 gt Cl_2 gt Br_2 gt I_2`D. All of the above |
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Answer» Correct Answer - D All the given statements are correct |
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| 96. |
A mixture of ethyl iodide and m-propyl iodide is subjected to Wurtz reaction. The hydrocarbon that will not be formed isA. n-butaneB. n-propaneC. n-pentaneD. n-hexane |
| Answer» Correct Answer - A | |
| 97. |
What is the maximum number of carbon atoms in the expected products of the Wurtz reaction, `CH_3-underset("Na+dry ether")(CH_2Br)underset(underset("Products")darr)(and)" "CH_3-underset(underset(CH_3)|)(CH)-CH_2Br`A. 8B. 6C. 4D. 2 |
| Answer» Correct Answer - A | |
| 98. |
In Wurtz reaction the reagent used isA. NaB. Na/lig.`NH_3`C. Na/dry etherD. Na/dry alcohol |
| Answer» Correct Answer - C | |
| 99. |
`C_5H_11Cl` by Wurtz reaction forms 2,2,5,5- tetramethylhexane as the main product . Then , what is the IUPAC name of the reactant ?A. 2,2-dimethyl-1-chloropropaneB. 2-methyl-1-chlorobutaneC. Both a and b are correctD. None of the above |
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Answer» Correct Answer - A `{:(" "C" " C),(" "|" "|),(C-C-C -C-C-C),(" "|" "|),(" "C " "uarr" " C),(" Point of symmetry "):}` Thus `C_5C_11Cl " is" H_3C - undersetoverset(|)(CH_3)oversetunderset(|)(CH_3)-CH_2Cl` |
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| 100. |
Isobutyl magneisum bromide with dry ether and absolute alcohol givesA. `CH_3-underset(underset(CH_3)|)(CH)-CH_2OHandCH_3-CH_3-CH_2MgBr`B. `CH_3-underset(underset(CH_3)|)(CH)-CH_2-CH_2-CH_3and Mg(OH)Br`C. `CH_3-underset(underset(CH_3)|)(CH)-CH_3andCH_3-CH_2OMgBr`D. `CH_3-underset(underset(CH_3)|)(CH)-CH_3,CH_2=CH_2andMg(OH)Br` |
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Answer» Correct Answer - C `CH_3-underset(underset(H)|)overset(overset(CH_3)|)C-underset(underset(H)|)overset(overset(H)|)C-Mg-Br+C_2H_5-O-Hto` `CH_3-underset(underset(H)|)overset(overset(CH_3)|)C-CH_3+C_2H_5-O-Mg-Br` |
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