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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.
| 151. |
The best method for the preparation of 2,2-dimethylbutane is via the reaction ofA. `Me_3CBr` and `MeCH_2Br` in Na/etherB. `(Me_3C)_2CuLi` and `MeCH_2Br`C. `(MeCH_2)_2 CuLi` and `Me_3CBr`D. `Me_3CMgI` and `MeCH_2I` |
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Answer» Correct Answer - B Corey-House alkane synthesis gives the alkane in best yield `(Me_3C)CuLi+underset((1^@))(MeCH_2Br)overset(S_N^2)to Me_3C-CH_2CH_3` |
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| 152. |
The compound which produce propane on heating with HI in presence of red P is `(a) CH_(3)CH_(2)CH_(2)I " "(b) CH_(3)CH_(2)CHO` `(c) CH_(3)CH_(2)CH_(2)OH " "(d)CH_(3)CH_(2)COOH`A. Only cB. b, cC. b, c, dD. All |
| Answer» Correct Answer - D | |
| 153. |
Reaction by which Banzaldehyde cannot be prepared?A. `+H_(2)` in presence of Pd`-BaSO_(4)`B. `+CO+HCl` in presence of anhydrous `AlCl_(3)`C. `+Zn//Hg` and conc. `HCl`D. `+CrO_(2)Cl_(2)` in `CS_(2)` followed by `H_(2)O`. |
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Answer» Correct Answer - 3 In `(3)` option the given reaction will not yield benzaldehyde. |
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| 154. |
Propane cannot be prepared from which reactionA. `CH_3-CH=CH_2underset(OH^-)overset(B_2H_6)to `B. `CH_3CH_2CH_2IundersetPoverset"HI"to`C. `CH_3CH_2CH_2Cl overset"Na"to`D. None of these |
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Answer» Correct Answer - A Hydroboration of alkenes followed by hydrolysis in basic medium yield alcohols and not the alkanes . `R-CH=CH_2overset(B_2H_6)to (R-CH_2-CH_2)_3 -B overset(OH^-)to R-CH_2-CH_2OH` |
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| 155. |
Solid methane isA. Molecular solidB. ionic solidC. Covalent solidD. Not possible |
| Answer» Correct Answer - A | |
| 156. |
Action of hydrogen chloride on `CH_3-underset(CH_3)underset|C=CH_2` and on `CH-=CH` will predominantly give the compounds, reapectivelyA. `CH_3-undersetunderset(CH_3)(|)CH-CH_2Cl` and `CH_2Cl-CH_2Cl`B. `CH_3-undersetunderset(CH_3)|"CCl"-CH_3` and `CH_3-CHCl_2`C. `CH_3-undersetunderset(CH_3)(|)CH-CH_2Cl` and `CH_3-CHCl_2`D. `CH_3-undersetunderset(CH_3)|CH-CH_3` and `CH_2Cl-CH_2Cl` |
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Answer» Correct Answer - B `CH_3-undersetunderset(CH_3)(|)C=CH_2+HCl to CH_3-undersetunderset(CH_3)(|)oversetoverset(Cl)(|)C-CH_3` `CH-=CH+HCl to CH_2 =CH-Cl overset"HCl"to CH_3-CHCl_2` |
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| 157. |
The C-H bond distance is longest inA. `C_2H_2`B. `C_2H_4`C. `C_2H_6`D. `C_2H_2Br_2` |
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Answer» Correct Answer - C C-H bond distance is longest in alkanes |
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| 158. |
Methane will be produced in which of the following reaction:A. `Be_(2)Coverset(H_(2)O)(to)`B. `CH_(3)OHoverset(LAH)(to)`C. `CH_(3)-Cloverset(Na)underset(EtoH)(to)`D. `Al_(4)C_(3)overset(H_(2)O)(to)` |
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Answer» Correct Answer - A::C::D `(a),(C),(d)` `Be_(2)C+4H_(2)O toCH_(4)+2Be(OH)_(2)` `CH_(3)-Cl overset(Na)underset("EtoH")(to)CH_(4)` `Al_(4)C_(3)+12H_(2)O to 3CH_(4)+4Al(OH)_(3)` |
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| 159. |
Method by which Aniline cannot be prepared isA. Hydrolysis of phenyl isocyanide with acidic solutionB. Degradation of benzamide with bromine in alkaline solutionC. Reduction of nitrobenzene with `H_2`/pd in ethanolD. Potassium salt of phthalimide treated with chlorobenzene followed by hydrolysis with aqueous NaOH solution |
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Answer» Correct Answer - D Chlorine of chlorobenzene is inert towards nucleophile, which is phthalimide ion |
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| 160. |
Alcoholic solution of KOH is used forA. DehydrationB. DehydrogenationC. DehydrohalogenationD. Dehalogenation |
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Answer» Correct Answer - C `CH_3-CH_2-Br+underset"alcoholic""KOH"overset"dehydrohal ogenation"to CH_2=CH_2+KBr +H_2O` In alcoholic KOH alkoxide ions `(RO^-)` are present which is a strong base. They abstract proton from `beta`-carbon of alkyl halide and favours elimination reaction. `underset"Alcohol""ROH"+KOHto underset"Potassium alkoxide"(ROK+H_2O)` `ROK to underset"Alkoxide ion"(RO^-) + K^+` `RO^(-) + H -oversetbeta(CH_2)-oversetalpha(CH_2)-Br to ROH + CH_2 =CH_2 +KBr` |
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| 161. |
The reaction of compound P with `CH_3MgBr` (excess) `(C_2H_5)_2O` followed by addition of `H_2O` gives Q. The compound Q on treatment with `H_2SO_4` at `0^@C` gives R. The reaction of R with `CH_3COCl` in the presence of anhydrous `AlCl_3` in `CH_2Cl_2` followed by treatment with `H_2O` produces compound S. [Et in compound P is ethyl group ] The reactions , Q to R an R to S areA. Aromatic sulfonation and Friedel-Crafts acylationB. Friedel-Crafts alkylation and Friedel-Crafts acylationC. Friedel-Crafts alkylation , dehydration and Friedel-Crafts acylationD. Dehydration and Friedel-Crafts acylation |
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Answer» Correct Answer - B Process involved in Q `to` R reaction is alkylation Process involved in R `to` S reaction is acylation |
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| 162. |
Five millitres of a gas (A) containing only C and H was mixed with an excess of oxygen (30 ml) and the mixture was exploded by means of an electric spark. After the explosion, the remaining volume of the mixed gases was 25 ml. On adding a concentrated solution of KOH, the volume further diminished to 15 ml.The residual gas being pure oxygen . The molecule formula of gas (A) isA. `C_2H_4`B. `C_2H_6`C. `C_3H_6`D. `C_3H_8` |
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Answer» Correct Answer - A `C_x H_y(g)+(x+y/4)O_2(g) to xCO_2(g)+y/2H_2O(1)` 1 ml `(x+y/4)` ml x ml- 5 ml `5(x+y/4)` ml 5x ml - Volume of gases remaining (i.e. volume of `CO_2` + volume of `O_2` unreacted)=25 ml Volume remaining after absorbing KOH=15 ml Volume absorbed by KOH=Volume of `CO_2`=25-15=10 ml Volume of `CO_2 rArr ` 5x =10 ml , x=2 Volume of `O_2` taken =30 ml Volume of `O_2` left =15 ml Volume of `O_2` reached =30-15=15 ml `therefore 5(x+y/4)=15 rArr 5(2+y/4)=15 rArr y=4` Formula of gas (A)=`C_2H_4` (Ethene) |
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| 163. |
`underset(CH)overset(CH)(|||)` reacts with acetic acid in presence of `Hg^(2+)` to giveA. `oversetoverset(CH_3)|CH(CH_3COO)_2`B. `{:(CH(CH_3COO)_2),(|),(CH(CH_3COO)_2):}`C. `oversetoverset(CH_3)|CH_2(CH_3COO)`D. None of these |
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Answer» Correct Answer - A Reaction of acetic acid with acetylene is catalysed by `Hg^(2+)` salt `HC-=CHunderset(Hg(OOC CH_3)_2)overset(CH_3COOH)to underset"vinyl acetate"(CH_2=CHOOC CH_3) underset(Hg(OOC CH_3)_2)overset(CH_3COOH)tounderset"ethylidene diacetate"(CH_3-CH(OO C CH_3)_2)` |
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| 164. |
Which one of these is not compatible with arenesA. Greater stabilityB. Delocalisation of `pi`-electronsC. Electrophilic additionD. Resonance |
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Answer» Correct Answer - C In arenes electrophilic substitution reaction takes place and it does not give electrophilic addition reactions. We also know that benzene is a resonance hybrid of two structures and greater stability of benzene is due to delocalization of `pi` electron |
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| 165. |
Which one of the following is a free -radical substitution reactionA. `CH_3CHO+HCN to CH_3CH(OH)CN`B. C. D. |
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Answer» Correct Answer - B Halogenation of alkyl group proceed via free radical mechanism |
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| 166. |
The order of appearance of the following with rising temperature during the refining of crude oil isA. Kerosene oil, gasoline, dieselB. Diesel, gasoline, kerosene oilC. Gasoline, diesel, kerosene oilD. Gasoline, kerosene oil, diesel |
| Answer» Correct Answer - D | |
| 167. |
Which of the following aliphatic compounds will discharge red colour of bromineA. `C_2H_4`B. `C_3H_6`C. `C_4H_8`D. All of these |
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Answer» Correct Answer - D `C_2H_4, C_3H_6` and `C_4H_8` all are alkene. Therefore they discharge the red colour of bromine |
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| 168. |
Which of the following is the most stableA. 1-buteneB. 2-buteneC. 1-penteneD. 2-pentene |
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Answer» Correct Answer - D `CH_3-CH=CH-CH_2-CH_3` will be the most stable because greater the number of alkyl groups attached to double bond carbon atoms, more stable is the alkene |
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| 169. |
To synthesize the unsymmetrical alkyne `CH_3-C-=C-CH_2-CH_3` the reagents needed would beA. Ethene, iodoethane, iodomethane and potassium hydroxideB. Acetaldehyde , 1-bromopropane and conc. `H_2SO_4`C. 1,2-dichloroethane , 1-propanol and alcoholic potassium hydroxideD. Ethyne, iodomethane , iodoethane and sodamide |
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Answer» Correct Answer - D `CH-=Choverset(NaNH_2)to CH-=C^(-)Na^(+) underset"-NaI"overset(CH_3I)to CH-=C-CH_3` `underset"Pent-2-yne"(C_2H_5-C-=C-CH_3)underset"-NaI"overset(C_2H_5I)larr Na^(+)C^(-) -=C-CH_3` |
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| 170. |
Which of the C-C bond is strongestA. Formed by `sp^3-sp^3` hybridised carbon atom (as in alkanes)B. Formed by `sp^2-sp^2` hybridised carbon atom (as in alkanes)C. Formed by sp-sp hybridised carbon atom (as in alkanes)D. All are equal |
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Answer» Correct Answer - C `sp-sp gt sp^2 - sp^2 gt sp^3 -sp^3` order of bond strength |
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| 171. |
Which of the following pairs has the same bond angleA. Ethane and ethyleneB. Ethylene and acetyleneC. Ethylene and benzeneD. Acetylene and benzene |
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Answer» Correct Answer - C `{:("Ethylene and Benzene",),(120^@,120^@),(sp^2 " " sp^2,):}` |
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| 172. |
The addition of HBr to 2-pentene givesA. 2-bromopentane onlyB. 3-bromopentane onlyC. 2-bromopentane and 3-bromopentaneD. 1-bromopentane and 3-bromopentane |
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Answer» Correct Answer - C `CH_3-CH_2-CH=CH-CH_3overset(H^+)to CH_3-CH_2-CH_2-overset+CH-CH_3 "and" CH_3-CH_2-overset+CH-CH_2-CH_3` |
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| 173. |
Type of reactions shown by alkynes are `-`A. Electrophilic addition reactionsB. Nucleophilic addition reactionsC. Substitution reactionD. All of the above |
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Answer» Correct Answer - 4 Alkyne gives all three types of reaction. |
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| 174. |
As the number of carbon atoms in a chain increases the boiling point of alkanesA. IncreasesB. DecreasesC. Remains sameD. May increase or decrease |
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Answer» Correct Answer - B Boiling point of alkanes increases with the number of carbon atoms because surface area increases which increases the Vander Waal forces. |
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| 175. |
The product obtained on reaction of `C_2H_5Cl` with hydrogen over palladium carbon isA. `C_3H_8`B. `C_4H_10`C. `C_2H_6`D. `C_2H_4` |
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Answer» Correct Answer - C `C_2H_5Cl+H_2overset"Pd/C"to C_2H_6+HCl` This reaction is used for the preparation of pure alkanes |
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| 176. |
The compound formed as a result of oxidation of ethyl benzene by `KMnO_4` isA. BenzophenoneB. AcetophenoneC. Benzoic acidD. Benzyl alcohol |
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Answer» Correct Answer - C Any aliphatic carbon with hydrogen attached to it, in combination with benzene ring , will be oxidized to benzoic acid by `KMnO_4//H^+` hence (c ) is correct |
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| 177. |
The compound used as an explosive isA. 2,4,6-tribromoanilineB. 1,3,5-trinitrobenzeneC. 2,4,6-trichlorotolueneD. 1,3,5-trichlorobenzene |
| Answer» TNT is used as an explosive | |
| 178. |
Meta-directing and deactivating group in aromatic electrophilic substitution isA. `-CH_3`B. `-OH`C. `-NO_2`D. `-Cl` |
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Answer» Correct Answer - C `-CH_3` Activating and o, p-directing -OH Activating and o,p-directing `-NO_2` Deactivating and m-directing -Cl Deactivating and o,p-directing `-OCH_3` Activating and o,p-directing |
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| 179. |
Among the following compound which one is planar in shapeA. methaneB. AcetyleneC. BenzeneD. isobutane |
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Answer» Correct Answer - C All 6 carbons of Benzene are `sp^2`- hybridised so it is planar |
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| 180. |
Which of the following compounds reacts slower than benzene in electrophilic substitutionA. B. C. D. |
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Answer» Correct Answer - C Nitro-group reduces the electron density on the benzene ring due to its strong -I effect |
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| 181. |
Benzene is prepared in laboratory from which one of the following compoundsA. `C_6N_5N_2Cl`B. `C_6H_5OH`C. `C_6H_5COONa`D. `C_6H_5SO_3H` |
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Answer» Correct Answer - C `underset"Sodium benzoate"(C_6H_5COONa)+NaOH overset"CaO"to underset"Benzene"(C_6H_6)+Na_2CO_3` |
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| 182. |
Product obtained by nitration of propane isA. NitropropaneB. NitromethaneC. NitroethaneD. All of these |
| Answer» Correct Answer - D | |
| 183. |
The following is a conjugated dieneA. `CH_3-CH=C=CH-CH_3`B. `CH_2=CH-CH_2-CH=CH_2`C. `CH_2=CH-CH_2-CH_2-CH=CH_2`D. `CH_2=oversetoverset(CH_3)|C-CH=CH_3` |
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Answer» Correct Answer - D Conjugated diene means two double bonds separated by a single bond |
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| 184. |
The compound X on reaction with `HgSO_4+H_2SO_4` gives Y which one oxidation gives acetic acid. X isA. `C_2H_2`B. `C_2H_4`C. `C_3H_4`D. `C_4H_6` |
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Answer» Correct Answer - A `underset"Ethyne"(CH-=CH)+H_2O underset(H_2SO_4)overset(HgSO_4)to underset"Vinyl alcohol"(CH_2=CH-OH)overset(KMnO_4)to CH_3CHO overset"oxidation"to underset"Acetic acid"(CH_3COOH)` |
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| 185. |
The minimum heat of reaction is required in the formation of `:`A. Methyl radicalB. Ethyl radicalC. `n-` propyl radicalD. tert`-` butyl radical |
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Answer» Correct Answer - 4 Tertiary `C-H` bond energy is minimum therefore minimum heat is required in the formation of tert- butyl radical. |
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| 186. |
`CH_(2)OHCH_(2)CH_(2)COCH_(3)overset("Reagent")rarr` `CH_(2)OHCH_(2)CH_(2)CH_(2)CH_(3)` Suitable reagent for above reaction is :-A. Zn-`Hg//HCl`B. `NH_(2)NH_(2)//C_(2)H_(5)ONa`C. Red P + HID. All |
| Answer» Correct Answer - B | |
| 187. |
Which of the following will produce same visual change as P-1 with `Br_(2)` water?A. B. C. D. None of these |
| Answer» Correct Answer - B | |
| 188. |
Ethylene is a member of ……...seriesA. AlkyneB. OlefinC. ParaffinD. Amine |
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Answer» Correct Answer - B Olefin because double bond is present |
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| 189. |
Towards electrophilic reagentsA. Ethene is more reactive than ethyneB. Ethene is less reactive than ethyneC. Both have equal reactivityD. The reactivity of both cannot be predicted |
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Answer» Correct Answer - A Alkynes are less reactive than alkenes towards electrophilic reagents because in alkynes, carbon has more s-character, so more strongly will be the attraction for `pi`-electron |
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| 190. |
The formation of alkene from alkyl halide is an example ofA. AdditionB. EliminationC. SubstitutionD. (a) and (c ) |
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Answer» Correct Answer - B `underset"Alkyl halide"(R-CH_2-CH_2)-Xunderset"alc. KOH"overset"Elimination"to underset"Alkene"(R-CH=CH_2)+underset"Halogen acid"(HX)` |
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| 191. |
Presence of peroxides affects the addition ofA. HBrB. HClC. HID. All of these |
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Answer» Correct Answer - A Peroxide rule is applicable only to HBr and not for HCl , HF and HI |
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| 192. |
Which of the following reactions can be used for the synthesis of an alkeneA. Chugaev reactionB. Dakin reactionC. Reimer-Tiemann reactionD. Wurtz-Fittig reaction |
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Answer» Correct Answer - A Chugaev reaction can be used for the synthesis of an alkene |
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| 193. |
How many gm of bromine will react with 21 gm `C_3H_6`A. 80B. 160C. 240D. 320 |
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Answer» Correct Answer - A `undersetundersetunderset"42 gms""1 mole""Propene"(CH_3-CH)=CH_2+undersetunderset"160 gms""1 mole"(Br_2)to CH_3-underset"1,2-Dibromo propane"(undersetunderset(Br)(|)CH_2-undersetunderset(Br)(|)CH_2)` `because` 24 gms of propene reacts with 160 gms of bromine `because` 21 gms of propene `160/42xx21=80` gms |
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| 194. |
`(CH_3)_2C-underset(CH_3)underset|CH underset(H_2)overset"Catalyst"to ` Optical isomersA. 2B. 4C. ZeroD. 3 |
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Answer» Correct Answer - C `(CH_3)_2-C=undersetunderset(CH_3)(|)CHunderset"hydrogenation"overset"Catalytic"to (CH_3)_2-CH-undersetunderset(CH_3)(|)CH_2` |
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| 195. |
The ozonolysis of `gt C= C lt ` producesA. `gt C=O+O =C lt`B. `gt C= O =O`C. D. |
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Answer» Correct Answer - A Ozonolysis of C=C gives aldehydes and ketones |
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| 196. |
Which of the following reacts with sodium with the elimination of hydrogenA. `CH_4`B. `C_2H_6`C. `C_2H_4`D. `C_2H_2` |
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Answer» Correct Answer - D `2CH-=CH+2Na to 2CH-= C^(-) Na^(+) +H_2` |
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| 197. |
The trans-alkenes are formed by the reduction of alkynes withA. `NaBH_4`B. `Na//liq. NH_3`C. Sn-HClD. `H_2//Pd//C, BaSO_4` |
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Answer» Correct Answer - B Na in liquid ammonia carryout anti and partial hydrogenation of alkyne to trans alkene |
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| 198. |
Acetylene is obtained by the electrolysis ofA. Sodium succinateB. Potassium fumarateC. Both (a) and (b)D. None of these |
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Answer» Correct Answer - B `{:(CH-COOK+2H_2Ooverset"Electrolyis"to, CH+2CO_2+2KOH+H_2),("||","|||"),(CH-COOK, CH):}` `{:(CH_2-COOK+2H_2Ooverset"Electrolyis"to, CH_2+2CO_2+2KOH+H_2),("|","||"),(CH_2COONa, CH_2):}` |
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| 199. |
Which of the following is an electrophileA. `H_2O`B. `NH_3`C. `AlCl_3`D. `C_2H_5NH_2` |
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Answer» Correct Answer - C `AlCl_3` is an electron deficient compound. Hence, act as an electrophile |
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| 200. |
Which of the following reactions is shown by alkynesA. AdditionB. SubstitutionC. PolymerizationD. All of these |
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Answer» Correct Answer - D Addition - `CH-=CH+3H_2 overset"Ni"to CH_3-CH_3` Substitution - `CH-=CH+Na to CH -= C^(-) Na^(+) +1/2H_2` Polymerization -`3CH-=Chunderset"Polymerization"overset"hot Cu tube"to underset"Benzene"(C_6H_6)` |
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