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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.
| 201. |
Elimination of `HBr`from 2 bromobutane results in the formation of .A. Equimolar mixture of 1-and 2buteneB. Predominantly 2-buteneC. Predominantly 1-buteneD. Predominantly 2-butanol |
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Answer» Correct Answer - B Major product follows Saytzeff rule |
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| 202. |
Which of the following is used in fire extinguishersb ?A. `CH_(4)`B. `CHCI_(3)`C. `CH_(2)CI_(2)`D. `C CI_(4)` |
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Answer» Correct Answer - D Its vapours are non-inflammable (i.e do not catch fire) Hence used as fire extinguishers under the name pyren . |
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| 203. |
Which of the following is liquid at room temperatureA. `CH_(3)I`B. `CH_(3)Br`C. `CH_(3)CI`D. `CH_(3)F` |
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Answer» Correct Answer - A `CH_(3)I` is a liquid at room temperature and solidifies at `-66.5^(@)C` others `CH_(3)F`, `CH_(3)CI, CI, CH_(3)Br` and `C_(2)H_(5)CI` are gases at room temperature . |
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| 204. |
Freon (dichlorodifluoro methane) is used .A. As local anaestheticB. For dissolving impurities in metallurgical process .C. In refrigeratorD. In printing industry |
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Answer» Correct Answer - C Feron `(C CI_(2)F_(2))` is an odourless non- corrosive nontoxic gas which is stable even at high temperatures and pressures It has low b pt low specific heat and can be easily liquefied by applying pressure at room temperature It is therefore widely used in refrigerant (cooling agent) in frigerators and air conditioners . |
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| 205. |
`RCH=CH_(2) overset(Na//NH_(2)(l))underset(C_(2)H_(5)OH)to RCH_(2)CH_(3)` The reaction is called as:A. Arndt-Eistert SynthesisB. Birch ReductionC. Clemmensen ReductionD. Fischer-Spier Reaction |
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Answer» Correct Answer - B Birch reduction. |
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| 206. |
`E_(1)` cB reaction is gives by which of the followingA. `CF_(3)-CHCI_(2)`B. `C_(6)H_(5)-underset(NO_(2))underset(|)CH-CH_(2)Br`C. .D. All of these |
| Answer» Correct Answer - D | |
| 207. |
A compound obtained by hydrolysis of the substance A, on reduction form 2-hexanol. Hence the substance A is :A. 3,3-dichloro hexaneB. 2,3 -dichlorohexaneC. 2,2-dichloro hexaneD. 1,1- dichlorohexene |
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Answer» Correct Answer - C `underset("2,2 dichlorohexane")(CH_(3)-overset(Cl)overset(|)underset(Cl)underset(|)(C )-CH_(2)CH2)-CH_(2)-CH_(3) overset("hydrolysis")underset(aq KOH)rarr` `underset("2 hexamone")(CH_(3)overset(O)overset("||")(C )-CH_(2)CHCH_(2)CH_(3))` |
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| 208. |
Which of the following sequence of reaction (reagents) can be used for conversion of `C_(6)H_(5)CH_(2)CH_(3)` into `C_(6)H_(5)CH=CH_(2)` ?A. `SOCl_(2), H_(2)O`B. `SO_(2)Cl_(2)` alc KOHC. `Cl_(2)//hv , H_(2)O`D. `COCl_(2)` , alc KOH |
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Answer» Correct Answer - B `C_(6)H_(5)CH_(2)CH_(3)overset(SO_(2)Cl_(2))underset(-SO_(2),-HCl)rarr C_(6)H_(5)-CHCl-CH_(3)overset(alc KOH)underset(-HCl)rarr C_(6)H_(5)CH=CH_(2)` |
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| 209. |
Which of the following reagents will not yield alkene?A. `C_(2)H_(5)OH overset("HI/Red P")underset(150^(@)C)rarr`B. Refluxing butanone with Zn/Hg-HClC. Hydroxylation of ethyneD. Electrolysis of sodium propionate solution |
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Answer» Correct Answer - C Hydroxylation of ethyne produces ethanol `CH-=CH+H_(2)O overset(H_(2)SO_(4))underset(Hg^(2+))rarr CH_(3)CHO` |
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| 210. |
Acrylonitrile is given by reagentsA. Acrylic acid and KCNB. Ethyne and KCNC. Ethyne and `HCN//Be^(2+)`D. Ethyne and HOCl. |
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Answer» Correct Answer - C `CH-=CH+HCN overset(Ba^(2+))rarr underset("Acrylonitrile")(CH_(2)=CH-CN)` |
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| 211. |
The alkane which has only primary hydrogen atoms isA. pentaneB. isopentaneC. neopentaneD. 2,2-dimethyl butane |
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Answer» Correct Answer - C The structure show that all the hydrogen atoms are attached to primary C-atoms hence primary hydrogen `underset("Neopentane")(H_(3)C-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")-CH_(3))` |
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| 212. |
Which one is not true for all the members of a homologous seriesA. All members are represented by the same genral formula.B. All members have same chemical propertiesC. All members have same physical propertiesD. All members have same functional group |
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Answer» Correct Answer - C C is wrong because all members of a homologous series show gradation in physical properties. |
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| 213. |
Which of the following compounds has the largest dipole moment ?A. `CH_(3)OH`B. `CH_(4)`C. `CF_(4)`D. `CH_(3)F` |
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Answer» Correct Answer - D `CH_(3)F` |
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| 214. |
How many trichloroethanes would be produced when 1,1-Dichloroethane reacts with chlorine ?A. OneB. TwoC. ThreeD. Four |
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Answer» Correct Answer - B Two `CH_(3)C Cl_(3)` and `CHCl_(2).CH_(2)Cl` |
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| 215. |
Carbon-halogen bond is most susceptible to cleave inA. Benzyl bromideB. BromobenzeneC. Vinyl bromineD. Benzyl chloride |
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Answer» Correct Answer - A In bromobenzene and vinyl bromide the carbon halogen bond acquires double bond character. Among benzyl bromide and benzyl chloride, C-Cl bond is relatively weaker. |
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| 216. |
The formation of `CH_(3)CH=CHCH_(2)Br` on treatment of 1-butene with NBS (N-Bromosuccinimide) is an example ofA. Hoffmann rearrangementB. 1,3 ShiftC. Allylic rearrangementD. `alpha`- Chlorination |
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Answer» Correct Answer - C Allylic substitution with NBS is an example of allylic rearrangement. |
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| 217. |
Name a reagent used for the bromination at the allylic carbon atom.A. `HBr//H_(2)O_(2)`B. HOBrC. `Br_(2)//CS_(2)`D. NBS |
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Answer» Correct Answer - D N-Bromosuccinimide. |
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| 218. |
Which hydrocarbon is consistent with the following formation ? Molecular mass =72 gives a single monochloride and two dichlorides on photochlorination.A. PentaneB. 2-MethylbutaneC. 2,2-DimethylpropaneD. All of the above |
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Answer» Correct Answer - C `(CH_(3))_(4)C+Cl_(2)overset(hv)rarr CH_(3)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")-CH_(2)-Cl overset(Cl_(2))underset(hv)rarr CH_(3)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")-CHCl_(2)+CH_(3)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")-CH_(2)Cl` |
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| 219. |
Which of the following represents aryl alkyl halide ?A. o-ChlorotolueneB. 1-Chloro-2-phenylethaneC. o-BromochlorobenzeneD. None of the above |
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Answer» Correct Answer - B `underset("1-Chloro-2-phenylethane")(C_(6)H_(5)CH_(2)CH_(2)Cl)` |
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| 220. |
Ullmann reaction involves the use of following reactants :A. Iodobenzene and sodiumB. Benzene and copperC. Iodobenzene and copper powderD. Benzene diazonium chloride and Cu/HCl |
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Answer» Correct Answer - C `C_(6)H_(5)I+Cu+C_(6)H_(5)I overset("Dry ether")underset(-Cu l_(2))rarr C_(6)H_(5)-C_(6)H_(5)` |
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| 221. |
Thionyl chloride is preferred in the preparation of chlorine compounds from alcohols becauseA. The reaction goes to completionB. The byproducts being gases, escape, hence there is no problem of separation of the productC. The reagent is chapeD. None of the above |
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Answer» Correct Answer - B `ROH+SOCl_(2)overset("Pyridine")rarr RCl+SO_(2)uarr+HCl uarr` |
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| 222. |
In order to prepare 1-chloropropane which of the following reactants can be employed ?A. Propene and HCl in the presence of peroxideB. Propene and `Cl_(2)` followed by tratment with aq. KOHC. Propanol-1 and `SOCl_(2)`/pyridineD. |
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Answer» Correct Answer - C `underset("Propannol-1")(C_(2)H_(5)CH_(2)OH)overset(SOCl_(2))underset("Pyridine")rarr underset("1-Chloropropane")(C_(2)H_(5)CH_(2)Cl)` |
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| 223. |
Chloropropane and isopropyl chloride with sodium in ether formsA. 2-methyl pentaneB. HexaneC. 3-methyl pentaneD. 4-methyl pentane |
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Answer» Correct Answer - A Tertiary halides preferably undergo `S_(N^(1))` substitution as they given suitable carbocation `underset("t-butyl chloride")(CH_(3)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")-Cloverset("slow")underset(-Cl)rarr)underset(("most stable"))underset(3^(@)"carbocation")((CH_(3))Coverset(_OH^(-))rarr)underset("t-butyl alcohol")((CH_(3))_(3)C-OH)` |
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| 224. |
Which of the following reaction will not give ether as a major product ?A. `CH_(3)CH_(2)Cl+Ag_(2)O`(dry)B. `(CH_(3))_(3)C Cl+CH_(3)CH_(2)O^(-)Na^(+)rarr`C. D. `CH_(3)Cl+overset(+)(N)a overset(-)O-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")-CH_(3)rarr` |
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Answer» Correct Answer - B Ether formation using alkoxide with alkyl halide is a `S_(N^(2))` reaction and is best for `1^(@) RX. 2^(@)` and `3^(@)RX` readily undergo elimination in the presence of a strong base to form alkenes `CH_(3)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")-Cl+CH_(3)CH_(2)ONa rarr CH_(3)-underset(CH_(3))underset("| ")("C ")=CH_(2)+NaCl+CH_(3)CH_(2)OH` |
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| 225. |
Assertion (A): Iodine is more soluble in `C Cl_(4)` than in water. Reason(R ): Non-polar solutes are more soluble in non-polar solvents.A. If the the assertion and reason are true and reason is a true explanation of the assertion .B. If both assertion and reason are true but reason is the correct explanation of the assertion .C. If the assertion is true but reason is trueD. If assertion is false but reason is true . |
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Answer» Correct Answer - A Like dissolves like non-polar solutes are soluble in non-polar solvent and polar solute are soluble in polar solvent . |
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| 226. |
`SN^(1)` reation is faster inA. `CH_(3)CH_(2)CI`B. C. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CI`D. `CH-underset(CH_(3))underset(|)underset(CH_(2))underset(|)(CH)-CI` |
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Answer» Correct Answer - C `S_(N)1` mechanism proceeds through carbocation intermediate ` CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CI` provides stable carbocation intermediate because it has tertiary carbon . |
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| 227. |
Assertion: The reactivity order for `S_(N)1` reation is `Ar_(3)CXgtAr_(2)CHXgtArCH_(2)X` Reason: More is the stability of carbocation more readily moment than cis 2-chloro propene . Reason: More is stability of carbocation more readily it is formed .A. If the the assertion and reason are true and reason is a true explanation of the assertion .B. If both assertion and reason are true but reason is not the correct explanation of the assertion .C. If the assertion is true but reason is trueD. If assertion is false but reason is true . |
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Answer» Correct Answer - A Both assertion and reason are true and the reason is the correct explanation of the assertion . |
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| 228. |
In the following reation `X` is `CH_(3) NH_(2)+X+KOHrarr CH_(3)NC` (highly offensive odour)A. `CH_(2)CI_(2)`B. `CHCI_(3)`C. `CH_(3)CI`D. `C CI_(4)` |
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Answer» Correct Answer - B `CH_(3) NH_(2) +CHCI_(3)+3KOHrarr3KCI+CH_(3)NC+3H_(2)O` . |
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| 229. |
`0.256` g of some nitrogenous compound was kjeldahlised and produced `0.155` g of ammonia. The % of nitrogen in the organic compound is approximatelyA. `5%`B. `50%`C. `30%`D. `80%` |
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Answer» Correct Answer - B N in `0.155` g of `NH_(3)=(14xx0.155)/(17)` `therefore %` of `N = (14xx0.155xx100)/(17xx0.256)~~ 49.9` or `50%` |
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| 230. |
Provide the structure of the major organic product which results in the following reaction. A. B. C. D. |
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Answer» Correct Answer - B `Beta-H` at the bridging carbon is anti to leaving group lost in `E_(2)` reaction . |
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| 231. |
In `S_(N^(1))` (substitution, nucleophilic, unimolecular) reaction, the reacemization takes place, it is due toA. inversion of configurationB. retention of configurationC. conversion of configurationD. Both A and B |
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Answer» Correct Answer - D Inversion and retention of configuration lead to racemisation. |
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| 232. |
HEATING ALKYL HALIDES WITH DRY SILVER OXIDEA. EsterB. EtherC. KetoneD. Alcohol |
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Answer» Correct Answer - B Alkyl halide on reaction with dry silver oxide furnish ether `2CH_(3)CI+Ag_(2)Ooverset(Delta)rarr underset(("metho xy mehane"))(CH_(3) OCH_(3)) + 2AgCI` . |
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| 233. |
The chloroform reacts with NaOH to giveA. `CH_(3)COONa`B. Sodium oxalateC. `CH_(3)OH`D. HCOONa |
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Answer» Correct Answer - D `CHCl_(3)+4NaOH rarr HCOONa+3NaCl+2H_(2)O` |
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| 234. |
When normal propyl chloride is heated at 575 K it formsA. PropaneB. 2-ChloropropaneC. PropyneD. Propylene |
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Answer» Correct Answer - B Alkyl halide undergoes rearrangement `underset("n-Propyl chloride")(CH_(3)CH_(2)CH_(2)Cl)underset(-Cl^(-))rarr underset((1^(@)))(CH_(3)CH_(2)CH_(2)+)rarr underset((2^(@)))(CH_(3)overset(+)(C )H-CH_(3))overset(Cl^(-))rarr underset("2-Chloropropane")(CH_(3)-underset(Cl)underset(|)(C )H-CH_(3))` |
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| 235. |
When ethyl iodide is heated with silver nitrate the product obtained isA. `C_(2)H_(5)Ag`B. `Ag-O-NO_(2)`C. `C_(2)H_(5)O-NO_(2)`D. `C_(2)H_(5)I-NO_(2)` |
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Answer» Correct Answer - C `C_(2)H_(5) -I + AgNO_(3)rarr C_(2)H_(5)ONO_(2) +Agl` |
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| 236. |
When ethyl iodide is heated with dry silver oxide, the product formed is :A. `C_(2)H_(5)OH`B. `C_(2)H_(5)OC_(2)H_(5)`C. D. `CH_(3)CHO` |
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Answer» Correct Answer - A `C_(2)H_(5)Br+underset("silver oxide")underset("Moist")(AgOH)rarr C_(2)H_(5)OH+AgBr` |
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| 237. |
Which of the following reacts with chloroform and base to form phenyl isocyanide ?A. NitrobenzeneB. PhenolC. ChlorobenzeneD. Aniline |
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Answer» Correct Answer - D `C_(6)H_(5)NH_(2)+CHCl_(3)+3KOH rarr C_(6)H_(5)NC+3KCl+3H_(2)O` |
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| 238. |
When ethyl iodide and n-propyl iodide are allowed to react with sodium metal in ether, the number of alkanes that could be produced isA. only oneB. two alkanesC. three alkanesD. four alkanes |
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Answer» Correct Answer - C `C_(2)H_(5)I+ICH_(2)CH_(2)CH_(3)overset(2Na)rarr C_(2)H_(5)CH_(2)CH_(2)CH_(3)` (Pentane) `2C_(2)H_(5)I+2Na rarr C_(2)H_(5)C_(2)H_(5)` (Butane) `2CH_(3)CH_(2)CH_(2)I rarr underset(("Hexane"))(CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CH_(3))` |
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| 239. |
`(CH_(3))_(3)-C-MgCl` on reaction with `D_(2)O` producesA. `(CH_(3))_(3)CD`B. `(CH_(3))_(3)COD`C. `(CD_(3))_(3)CD`D. `(CD_(3))_(3)OD` |
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Answer» Correct Answer - A `(CH_(3))_(3)C-Mg-Br+DOD rarr (CH_(3))_(3)CD+Mg(OD)Br` |
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| 240. |
Which of the following aryl halides will react fastest with aq. NaOH at high temperature asnd high presure ?A. B. C. D. |
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Answer» Correct Answer - A The high reactivity of fluorobenzene in this case is due to the strong I-effect of the F-atom which stabilizes the transition state of the first step. |
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| 241. |
Alkyl halides react with dialkyl copper reagents to giveA. alkenesB. alkyl copper halidesC. alkanesD. alkenyl halides |
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Answer» Correct Answer - C `R_(2)CuLi+CH_(3)CH_(2)-Br rarr R-CH_(2)CH_(3)+Rcu+LiBr` |
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| 242. |
The order of reactivities of the following alkyl halides for a `S_(N^(2))` reaction is :A. RF gt RCl gt RBr gt RIB. RF gt RBr gt RCl gt RIC. RCl gt RBr gt RF gt RID. RI gt RBr gt RCl gt RF |
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Answer» Correct Answer - D Order of reactivity : RI gt RBr gt RCl gt RF Lesser the bond strength of C-X bond, more is the reactivity. |
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| 243. |
Which one is most reactive towards `S_(N^(1))` reaction?A. `C_(6)H_(5)CH(CH_(3))Br`B. `C_(6)H_(5)(CH_(3))(C_(6)H_(5))Br`C. `C_(6)H_(5)CH_(2)Br`D. `C_(6)H_(5)CH(C_(6)H_(5))Br` |
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Answer» Correct Answer - B `S_(N^(1))` reaction involves the formation of carbocation intermediated. More stable is the carbocation intermediate, more reactive will be the alkyl/aryl halides towards `S_(N^(1))` reaction `C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br` is most reactive towards `S_(N^(1))` reaction. `C_(6)H_(5)C^(+)(CH_(3))(C_(6)H_(5))gt (C_(6)H_(5))C^(+)H(C_(6)H_(5))gt(C_(6)H_(5))CH^(+(CH_(3))gt C_(6)H_(5)overset(**)(C )H_(2)`. |
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| 244. |
In both alkyl halides, The halogen atom is attached directly to the carbon atoms. They are expected to exhibit similar reactivity. However,aryl halides are comparatively little reactive, particularly towards nucleophilic substitution reactions. For example, hydrolysis of ethyl chloride takes place by simple boiling with aqueous KOH. On the other hand, the alkaline hydrolysis of chlorobenzene needs a very high temperature (623 K) as well as very high pressure Among the following, which has weakest C-X bondA. benzyl bromideB. BromobenzeneC. Vinyl bromineD. ethyl bromide |
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Answer» Correct Answer - A `C_(6)H_(5)CH_(2)-Br` has weakest C-X. bond as `C_(6)H_(5)overset(o+)(C )H_(2)` ion is easily resonance stabilized. More over C-Br can cleave most easily. |
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| 245. |
Gammexane isA. ChlorobenzeneB. Benzyl chlorideC. BromobenzeneD. Benzene hexachloride |
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Answer» Correct Answer - D Gammexane is benzene hexachloride or lindane or 666. |
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| 246. |
Gammexane is the name given toA. `C_(6)H_(3)Cl_(3)`B. `C_(6)H_(4)Cl_(2)`C. `C_(6)H_(6)Cl_(6)`D. Diphenyltrichloroethane. |
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Answer» Correct Answer - C `C_(6)H_(6)Cl_(6)` |
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| 247. |
`(CH_(3))_(3) CMgCl` on reaction with `D_(2)O` producesA. `(CH_(3))_(3)CD`B. `(CH_(3))_(3)OD`C. `(CH_(3))_(3)CD`D. `(CH_(3))_(3)OD` |
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Answer» Correct Answer - A `(CH_(3))_(3) C-MgCI+D_(2)Orarr(CH_(3))_(3)C-D+Mg(OD)CI` As `R` of Grignard s reagent will take proton and from alkane . |
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| 248. |
A solution of (-l)- chloro -1 phenyletane in toluene recemises slowly in the presence of a small amunt of `SbCI_(5)` due to the formation of .A. carbanionB. carbeneC. carbocationD. free radical |
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Answer» Correct Answer - C The given compound , (-1) cholro 1 phenylethane in the presence of `SbCI_(5)` froms a carbocation `CI -CH-CH_(3) underset("Toluene")overset(SbCI_(5))rarr[Ph - overset(+)CH - CH_(3)] + SbC1ba_(6)^(-)` . Since the carbocation is a planar species therefore it can be attacked by `SbCI_(6)` either from the front or back side of the carbocation with equal ease As a result 50 :50 mixture of two enantiomers of 1-chloro 1 phenylethane undergoes racemization due to the formation of a carbocation intermediate `[Ph -overset(+)CH-CH_(3)]SbC1_(6)rarrPh -underset(["d and 1 forms"])underset(C1)underset(|)CH -CH_(3) + SbC1_(5)` . |
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| 249. |
Which of the following organic compounds will give a maxiture of 1-chlorobutane and 2-chlorobutance on chlorintaionA. `CH_(3)-underset(CH_(3))underset(|)CH-CH =CH_(2)`B. `HC = C-overset(H)overset(|)C = CH_(2)`C. `CH_(2) =CH-CH=CH_(2)`D. `CH_(2) =CH-CH_(2)-CH_(3)` |
| Answer» Correct Answer - D | |
| 250. |
2-chlorobutane obtained by chlorination of butane will be .A. meso -formB. d-formC. recemic formD. l-form |
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Answer» Correct Answer - C An optically inactive compound forming optically active compound during a reaction always gives racemic mixture . |
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