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.
| 151. |
Write down the IUPAC names and structures of all the possible isomers having the molecular formula `C_(2)H_(4)CI_(2)` . How are these prepared and distinguished ? |
| Answer» `C_(2)H_(4)CI_(2)-` Two structural isomers `CH_(3)CHCI_(2)` (1,1-dichloroethane) and `CH_(2)CICH_(2)CI` (1,2-dichloroethane) . | |
| 152. |
An optically inactive compound (A) having molecular formula `C_(4)H_(11)H` on treatment with `HNO_(2)` gave an alconot (B) which on heating with conc. `H_(2)SO_(4)` at 440 k gave an alkene ( C) . ( C) on treatment with HBr gave an optically active compound (D ) having molecular formula `C_(4)H_(9)Br` Identify (A) ,(B) ,(C) and (D). |
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Answer» `(A) CH_(3) CH_(2) CH_(2) CH_(2) NH_(2)` (B ) `CH_(3)CH_(2)CH_(2)- CH_(2) OH` ( C)`CH_(3) -CH =CH -CH_(3)` (D ) ` CH_(3)- CH_(2) - CHBr -CH_(3)` |
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| 153. |
What is the stereochemical result of `S_(N)^(1)` and `S_(N) ^(2)` reactions ? |
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Answer» `to` The stereochemical result of `S_(N) 1` reaction is reacemisation product . `to` The stereochemical result of `S_(N) 2` reaction is inversion product . |
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| 154. |
Treatment of alkyl halides with aq. KOH leads to the formation of alcohols , while presence of alc. KOH what products are formed ? |
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Answer» `to` Treatment of alkyl halides with aq. KOH leads to the formation of alcohols . Here Nucleophilic substitution reaction takes place. Eg : `C_(2)H_(5) Cl + "aq." KOH to C_(2) H_(5) OH + KCl` `to` Treatment of alkyl halides with alc. KOH leads to the formation of alkenes . Here elimination reaction takes place . Eg : `C_(2)H_(5) Cl + "alc." KOH to C_(2)H_(4) + KCl + H_(2)O` |
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| 155. |
An equimolar mixture of toluene and chlorobenzene is treated with a mixture of conc. `H_(2)SO_(4)` and conc. `HNO_(3)` Indicate the correct statement from the following :A. p-nitrotoluene is formed in excessB. equimolar amounts of p-nitrotoluene and p-nitro- chlorobenzene are formedC. p-nitrochorobenzene is formed in excessD. m-nitrochlorobenzene is formed in excess |
| Answer» Correct Answer - A | |
| 156. |
Rank the alkyl halides in order of increasing reactivity in `E_(2)` reaction. |
| Answer» `(a) P gt R gt Q (b) gt R gt P (C) Q gt P gt R` | |
| 157. |
(a) Indicate whether the following are `S_(N^(1)),S_(N^(2)),E_(1) " or "E_(2)` reactions. `(i) CH_(3)CH_(2)CH_(2)CI+I^(-) to` `(ii) (CH_(3))_(3) CBr+CN^(-)(alc.) to` `(iii) CH_(3)CH(Br)CH_(3) +OH^(-) (alc.) to` `(iv) (CH_(3))_(3) C-Br+H_(2)O to` (b) Give the decreasing order of reactivity of the alkaline hydrolysis of the following alkyl halides toward `(A)S_(N^(1))(B) S_(N^(2))(C)` in pressure of `AgNO_(3).` `(i) (CH_(3))_(2)C(Br) -C_(2)H_(5) (ii)C_(5)H_(11)Br` `(iii) C_(2)H_(5)CH(Br)C_(2)H_(5)` (c) Give the decreasing order reactivity of the alkaline hydrolysis of hte following halides towards `S_(N^(1)) (i) MeCI (ii) PhCH_(2)CI(ii)Ph_(2)CHCI(iii)Ph_(3)C-CI`. (d) Determine the relative `S_(N^(2))` reactivity with NaCI in aprotic DMSO of the following alkyl halides : `(A) (i) CH_(3)CHCICH_(2)CH_(3)(ii)CH_(3)CHBrCH_(2)CH_(3)` `(iii) CH_(3)CHICH_(2)CH_(3)` `(B) (i) CH_(3)CH(CH_(3))CH_(2)CH_(2)I` `(ii) CH_(3)CH(CH_(3))CHICH_(3)(iii) CH_(3)CI(CH_(3)) CH_(2)CH_(3)` (e) Arrange the following in the order of decreasing nucleophilic character: `H_(2)O,^(-)OH,CH_(3)O^(-), CH_(3)COO^(-)` (f) Arrange the following in the decreasing order as leaving group in `S_(N)` reaction: `CH_(3)COO^(-), C_(6)H_(5)O^(-), C_(6)H_(5)SO_(3)^(-), CH_(3)O^(-)` |
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Answer» `(a) (i) CH_(3)CH_(2)CH_(2)-I " is " S_(N^(2)) " reaction "(1^(@)"halide and " I^(-)` is a good nucleophile and poor base. `(ii) CH_(3)CH=CH_(2) " is " E_(2)` reaction, less polar solvent favours `E_(2)`. `(iv) (CH_(3))_(3)C-OH " is "S_(N^(1))` reaction as `H_(2)O` is not basic enough to remove a proton to give elimination reaction. `(b) (A) (i) gt (iii) (3^(@) gt 2^(@) gt 1^(@)" alkyl halides ")S_(N^(1))`. `(B) (ii) gt (iii) gt (i) (1^(@) gt 2^(@) gt 3^(@) " alkyl halides")S_(N^(2)).` `(C) (i) gt (iii) gt (ii) : " Heavy ions such as " Ag^(+) " or " Pb^(2+) " catalyse " S_(N^(1))`. `(C) (iv) Ph_(3) C-CI gt (iii) Ph_(2) CH-CI gt (ii) PhCH_(2) -CI gt (i) NeCI.` `(d) (A) (iii) gt (ii) gt (i) ("Group leaving ability is " I^(-) gt Br^(-) gt CI^(-))` `(B) (i) gt (ii) gt (iii) ("steric factor makes the reactivity " 1^(@) gt 2^(@) gt 3^(@))`. (e) When the nucleophilic centre is same . The nucleophilicity is same as basic character. Acidic character :`H_(3)O^(+) gt CH_(3)COOH gt CH_(3)OH gt H_(2)O.` Basicity and nucleophilicity : `H_(2)O lt CH_(3)COO^(-) lt CH_(3)O^(-) lt OH^(-)`. (f) Weaker the base or stronger the acid, better is the leaving group. Acidic character : `C_(6) H_(5)SO_(3)H gt CH_(3)COOH gt C_(6)H_(5)OH gt CH_(3) OH.` |
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| 158. |
The order of reactivity of different halogens with alkanes for halogenation is sA. `F_(2)gtCl_(2)gtBr_(2)gtI_(2)`B. `F_(2)gtBr_(2)gtC_(2)gtI_(2)`C. `F_(2)gtCl_(2)gtI_(2)gtBr_(2)`D. `F_(2)gtI_(2)gtBrgtCl_(2)` |
| Answer» Correct Answer - A | |
| 159. |
The addition of HI in the presence of peroxide does not show anti-Markovnikov behavior becauseA. the HI band is too strong not to be broken homolyticallyB. HI is reducing agentC. I free radical so formed readily combine with each other to give `I_(2)` moleculeD. I comine with H to give back HI |
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Answer» Correct Answer - C H-I bond is weak (71/Kcal/mole) breaks homolytcically 1 free radical, it so formed combine each other produces `I_(2)` molecule. |
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| 160. |
Give structures and IUPAC names of the products expected from reaction between 1-chlorobutane and (a) KOH (alc) (b) NaOH(aq). (c) `NH_(3) ,(d) H_(2)S,(e) C_(6)H_(t) +AICI_(3)`, `(f)C_(2)H_(5)ONa` |
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Answer» `(a) CH_(3)CH_(2)CH=CH_(2) ("But -1-ene")`, `(b) CH_(3)CH_(2)CH_(2)CH_(2)OH ("Butan-1-ol"),` `(C) CH_(3)CH_(2)CH_(2)CH_(2)NH_(2) ("Butanamine") ,` `(d) CH_(3)CH_(2)CH_(2)CH_(2)SCH_(2)CH_(2)CH_(2)CH_(3) ("1-Butylhiobutane") ,` `(e) C_(6)H_(5)-C_(4)H_(9) ("Butylbenzene"),` `(f) C_(4)H_(9)OC_(2)H_(5) ("1-Ethoxybutane")` |
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| 161. |
Indicate which of the following is correctA. Increasing the concentration of nucleophile favors an `SN^(1)` reaction over `SN^(2)` reactionB. ethyl iodide is more reaction than ethyl choride in an `SN^(2)` reactionC. In an `SN^(2)` reaction, a greater yield of the product with retained configuration is obtainedD. An `SN^(2)` reaction is two step reaction |
| Answer» Correct Answer - B | |
| 162. |
In the presence of peroxide HCl do not give anti Markownikoffs addition to alkene becauseA. it is highly ionicB. it is oxidising agentC. peroxide cannot break HCl bondD. it is highly polar |
| Answer» Correct Answer - C | |
| 163. |
Elimination of bromine and hydrogen from 2-bromobutane results in the formation ofA. predominantly trans 2-butyneB. equimolar mixture of 1-butene and 2-buteneC. predominantly cis 2-butyneD. predminantly 1-butyne |
| Answer» Correct Answer - A | |
| 164. |
1-chlorobutane on elimination gives,A. 1-buteneB. 2-buteneC. 1-butanolD. 2-butanol |
| Answer» Correct Answer - A | |
| 165. |
In the elimination reaction of ethyl halide carbon atom change its hybridisation is,A. `sp^(2)"to"sp^(3)`B. `sp^(3)"to"sp`C. `sp^(3)" to "sp^(2)`D. `sp" to "sp^(3)` |
| Answer» Correct Answer - C | |
| 166. |
An alkyl halide `(X)`of the folmula `C_(6)H_(13)Cl` on treatment with potassium tertiary butoxide gives two isomeric alkenes `(Y)` and `(Z)(C_(6)H_(12))`. Both the alkenes on hydrogenation give `2,3-`dimethyl butane. Perdict the structures of `(X),(Y)` , and `(Z)` |
| Answer» Correct Answer - `(X) (CH_(3))_(2)CH-underset(CI)underset(|)C(CH_(3))_(2),(y) CH_(3) -underset(CH_(3))underset(|)C=underset(CH_(3))underset(|)C-CH_(3) , (Z) CH_(3)-underset(CH_(3))underset(|)CH-underset(CH_(3))underset(|)C=CH_(2)` | |
| 167. |
Durig alkaline hydrolysis of `3^(@)` alkyl halide, if cencentration of aq. Potash is doubled, the rate of reaction is,A. doubleB. remaine sameC. tripeD. upredictable |
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Answer» Correct Answer - B Because rate of reaction depends upon concentration of anly `3^(@)` alkyl halide not on concentration of aq. Potash. |
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| 168. |
Chlorination of ethane in the presence of U.V. light folowed by treatement with aq. NaOH gives.A. sodium ethoxideB. ethanolC. etheneD. metha |
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Answer» Correct Answer - B `C_(2)H_(6)+Cl_(2)overset(U.V."light") to C_(2) H_(5)Cl+HCl` `C_(2)H_(5)+NaOH overset(aq) to C_(2)H_(5)OH+NaCl` |
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| 169. |
An alkyl halide of formula `C_(4)H_(9)Cl` on treatement with alcoholic potash gives alkenes `C_(4)H_(8)`. Both alkenes on tratment with HI gives 2-iodo butate. Isomeric alkenes areA. `CH_(3)CH_(2)CH=CH_(2) and CH_(3)CH=CHCH_(3)`B. `CH_(3)CH_(2)=CH_(2) and (CH_(3))_(2)C=CH_(2)`C. `CH_(3)CH=CH_(2) and CH_(3) CH=CHCH_(3)`D. `CH_(3)CH_(2)CH=CH_(2) and CH_(3)CH=CH_(2)` |
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Answer» Correct Answer - A Because rate of reaction depends upon concentration of anly `3^(@)` alkyl halide not on concentration of aq. Potash. (a) Molecular formula `C_(4)H_(9)Cl` has four isomers, thses are n-butyl chloride,sec. butyl chloride. Former two on elimination gives 1-butene and 2-butene respectively and latter two on elimination gives siobutylene. 1-butene and 2-butene are treated withHI gives 2-iodobutane. 1-butene and 2-butene are position isomers. Isobutylene is treated with HI gives t-butyl iodide hence answer is (a) |
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| 170. |
Alcoholic solution of caustic potash is a specific reagent forA. dehydrationB. dehydrohalogenationC. dehydrogenationD. dehalogenation |
| Answer» Correct Answer - B | |
| 171. |
Compound A is heated with alcoholic potash gives `(CH_(3))_(2)C=CH-CH_(3)`. The compound A isA. t-pentyl alcoholB. iso-pentyl alcoholC. neo-pentyl bromideD. n-pentyl alcohol |
| Answer» Correct Answer - C | |
| 172. |
Lesst reactive alkyl halide towards `SN^(2)` mechanism isA. `(CH_(3))_(3)CH-CH_(2)-Br`B. `(CH_(3))_(2)CH-CH-Br CH_(3)`C. `(CH_(3))_(3)C-CH_(2)-CH_(2)-Br`D. `(CH_(3))_(3)C- underset(C(CH_(3))_(3)) underset(|)(CH)-CH_(2)-Br` |
| Answer» Correct Answer - B | |
| 173. |
Isopropyl magnesiumbromide with dry ether an methanol givesA. `CH_(3)- underset(OH) underset(|)(CH)-CH_(2)-CH_(3) and CH_(3)-CH_(2)-MgBr`B. `CH_(3)-CH_(2)-CH_(3) and CH_(3)-CH_(2)-OMgBr`C. `CH_(3)-CH_(2)-CH_(3) and CH_(3) OMgBr`D. `CH_(3) -underset(CH_(3)) underset(|)(CH)-CH_(3) and CH_(3) and CH_(3) OMgBr` |
| Answer» Correct Answer - C | |
| 174. |
Tertiary alkyl halide are practially inert to substitution by `SN^(2)` mechanism because of-A. the carbocation formed is unstableB. there is steric hindraceC. there is inductive effectD. the rate of reaction is faster is `S_(N^2)` mechanism. |
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Answer» Correct Answer - B In tertiary alkyl halides steric hindrance does not allow subsitution by `S_(N^2)` mechanism in which the numbleophile attacks on the carbon atom and the reaction takes place in single step. |
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| 175. |
`(CH)_(3))_(2)C-` MgBr reaction with `H_(2)O` producedA. `(CH_(3))_(2) CH`B. `(CH_(3))_(3)CH`C. `(CH_(3))_(3)COH`D. `(CH_(3))_(3)OH` |
| Answer» Correct Answer - A | |
| 176. |
The order of reactivity of following alkyl halide in `SN^(2)` reaction isA. `R-I gt R-Br gt R-Cl gt R-F`B. `R-F gt R-Cl gt R-Br gt R-I`C. `R-I gt R-CI gt R-Br gt R-F`D. `R-I gt R-F gt R-Br gt R-CI` |
| Answer» Correct Answer - A | |
| 177. |
Decreasing order of reactivity of alkyl halide for dehydrohalogenation is :A. `RI gt RCI RBr gr RF`B. `RF gt RI RBr gt RCI`C. `RI gt RBr gr RCI gt RF`D. `RF gt RCI gt RBr gt RI` |
| Answer» Correct Answer - C | |
| 178. |
Reactivity order of halides for dehydrohalogenation isA. `R-FgtR-ClgtR-BrgtR-I`B. `R-IgtR-BrgtR-ClgtR-F`C. `R-IgtR-ClgtR-BrgtR-F`D. `R-FgtR-IgtR-BrgtR-Cl` |
| Answer» Correct Answer - B | |
| 179. |
2-Bromopentane is heated with potassium ethoxide in ethanol. The major product obtained isA. pent-1-eneB. cis pent-2-eneC. trans-pent-2-eneD. 2-ethoxypentane |
| Answer» Correct Answer - C | |
| 180. |
the non-reactivity of chlorine atom in `H_(2) C=CH-CI` is due to :A. inductive effectB. resonance stabilizationC. electromeric effectD. electronegativity |
| Answer» Correct Answer - B | |
| 181. |
What happens when `C CI_(4)` is treated with `AgNO_(3)` solution ?A. `NO_(2)` will be evolvedB. A white ppt. will be formedC. `C Cl_(4)` wil dissolve in `AgNO_(3)` solutionD. No reaction takes place |
| Answer» Correct Answer - D | |
| 182. |
Chloropicrin is obtained by the reaction ofA. steam on carbon tetrachlorideB. nitric acid on chlorobenzeneC. chlorine on picric acidD. nitric acid on chloroform |
| Answer» Correct Answer - D | |
| 183. |
Ethyl orthoformate is formed by heating `"…….."` with sodium ethoxide.A. `HCOOH`B. `C_(2)H_(5)OH`C. `CHCI_(3)`D. `CH_(3)CHO` |
| Answer» Correct Answer - C | |
| 184. |
A mixture of ethyl iodide and n-proplyl iodide is treated with sodim of any one of the following substance is treated with sodium. The correct substace isA. propeneB. butaneC. pentaneD. hexane |
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Answer» Correct Answer - A `3C_(2)H_(5)I+6Na+3CH_(3)CH_(2)CH_(2)l overset("dry ether") to C_(6)H_(6)C_(5)H_(12)+C_(4)H_(10)+6Nal` |
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| 185. |
Chloropicrin is :A. picric derivativeB. nitrochloroformC. nitromethaneD. nitroethyl chloride |
| Answer» Correct Answer - B | |
| 186. |
Heating together of sodium ethoxide and ethyl iodide will give:A. ethyl alcoholB. acetaldehydeC. diethyl etherD. acetic acid |
| Answer» Correct Answer - C | |
| 187. |
the bad smelling substance formed by the action of alcoholic caustic potash of chloroform and aniline is :A. phenyl isocyanideB. nitrobenzeneC. chloropicrinD. acetylene |
| Answer» Correct Answer - A | |
| 188. |
`"………"` would be obtained by boiling `CHCI_(3)` with caustic soda.A. Sodium acetateB. Sodium formateC. Sodium oxalateD. Methyl alcohol |
| Answer» Correct Answer - B | |
| 189. |
In the `S_(N)2` reaction of cis -3- methylcyclo pentyl bromide with alkali the product formed isA. A cis alcoholB. A trans alcoholC. An equimolecular mixture of cis and trans alcoholD. There is no reaction |
| Answer» Correct Answer - 2 | |
| 190. |
What is the nature of neo-pentyl bromide? |
| Answer» Primary alkyl halide | |
| 191. |
An organic halogen compound which is used as refrigerant in refrigerators and air conditioners isA. BHCB. `C Cl_4`C. freonD. `CHCl_3` |
| Answer» Correct Answer - C | |
| 192. |
What is the correct IUPAC name for `CH_3-underset(C_2H_5)underset(|)"CH"-CH_2-Br ?`A. 1-Bromo-2-ethylpropaneB. 1-Bromo-2-ethyl-2-methylethaneC. 1-Bromo-2-methylbutaneD. 2-Methyl-1-bromobutane |
| Answer» Correct Answer - C | |
| 193. |
The products (A) and (B) are respectively. (i) `CH_3-underset(Br)underset(|)(CH)-underset(CH_3)underset(|)(CH)-CH_3overset(C_2H_5ONa)to(A)` (ii) `CH_2=overset(CH_3)overset(|)(C)-CH_2CH_3underset("Peroxide")overset(HBr)to(B)`A. `CH_3-underset(Br)underset(|)CH-underset(CH_3)underset(|)CH-CH_3overset(C_2H_5ONa)rarr(A)`B. `CH_2=overset(CH_3)overset(|)C-CH_2CH_3overset(Hbr)underset("Peroxide")rarr(B)`C. `CH_3CH_2-overset(CH_3)overset(|)"CH"-CH_3,CH_3(CH_2)_2CH_3`D. `CH_3CH_2-underset(OC_2H_5)underset(|)C(CH_3),underset(Br)underset(|)CH_2-underset(CH_3)underset(|)"CH"-CH_2-CH_2` |
| Answer» Correct Answer - B | |
| 194. |
The correct decreasing order of reactivity for a given `(R) ` group in both `S_(N^(1)) " and " S_(N^(2))` reaction mechanism is :A. `RF gt RCl gt RBr gt RI`B. `RF gt RBr gt RCl gt RI`C. `RCl gt RBr gt RF gt RI`D. `RI gt RBr gt RCl gt RF` |
| Answer» Correct Answer - D | |
| 195. |
Write IUPAC name |
| Answer» 3-Bromo-2-methylbut-1-ene | |
| 196. |
The reagent used in the conversion of 1-butanol to 1-bromobutane is :A. `CHBr_(3)`B. `Br_(2)`C. `CH_(3) Br`D. `PBr_(3)` |
| Answer» Correct Answer - D | |
| 197. |
The reagent used in the conversion of 1-butanol to 1-bromobutane is :A. `CHBr_(3)`B. `Br_(2)`C. `CH_(3)Br`D. `PBr_(3)` |
| Answer» Correct Answer - D | |
| 198. |
During dehydrohalogenation of 2-bromobutane the major product isA. 1-butaneB. 2-buteneC. 1-butanolD. 2-butanol |
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Answer» Correct Answer - B The major product 2-butane in which is formed accroding to Saytzeff rule. `CH_(3)CHBrCH_(2)CH_(3)+KOH overset(alc) to H_(2)O+KBr+CH_(3)CH=CHCH_(3)` |
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| 199. |
When 1-chloropropane is treated with alc. Potash gives propene. The reacts isA. eliminationB. subsitutionC. additionD. dehyderation |
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Answer» Correct Answer - A This is elimination reaction, in which halogen and hydroge areremoved froma adjacent carbon atom and produce prepene |
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| 200. |
Assertion: Chlorination of ethyl benzene with with `Cl_(2)` in the presence of heat and light mainly yields 1-chloro-2-phenylethane. Reason: The reaction occurs through the formation of `C_(6)H_(5)CH_(2)overset(**)(C)H_(2)` intermediate.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 - D Correct assertion. Chlorination of ethyl benzene with `Cl_(2)` in the presence of heat and light gives 1-chloro-1-phenylethane. Correct reason. The reaction occurs through the formation of benzylic intermediate `(C_(6)H_(5)overset(**)(C)HCH_(3))`. |
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