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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.
| 1. |
How does anisole reacts with : (i) `Br_(2)` in `CS_(2)` (ii) HI at 373 K ? |
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Answer» (i) A mixture of o and p-bromoanisole is formed (ii) Phenol and `CH_(3)I` are formed |
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| 2. |
How many isomeric alcohols with formula `C_(4)H_(10)O` are possible ?A. 3B. 2C. 4D. 5 |
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Answer» Correct Answer - A Three isomeric ethers are represented. Thses are: `C_(2)H_(5)-O-C_(2)H_(5),CH_(3)-O-C_(3)H_(7),CH_(3)-O-underset(CH_(3))underset(|)(CH)-CH_(3)` |
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| 3. |
Complete the following reaction : `C_(6)H_(5)Ona+C_(2)H_(5)CIrarr` |
| Answer» `underset("Sod. phenate")(C_(6)H_(5)ONa)+C_(2)H_(5)CIrarrunderset("Ethoxybenzene")(C_(6)H_(5)OC_(2)H_(5))+NaCI` | |
| 4. |
When diethyl ether is treated with excess of `CI_(2)` in the presence of sum light, the product formed is :A. `CH_(3)CHCI-O-CH_(2)CH_(3)`B. `CH_(3)CHCI-O-CHCICH_(3)`C. `C CI_(3)C CI_(2)-O-C CI_(2)C CI_(3)`D. `CH_(3)C CI_(2)-O-CHCICH_(3)`. |
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Answer» Correct Answer - C Perchlorodiethyl ether is formed. |
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| 5. |
`CH_(3)OC_(2)H_(5)` and `(CH_(3))_(3)COCH_(3)` are treated with hydroiodic acid. The fragments after reaction obtained areA. `CH_(3)I+C_(2)H_(5)OH,(CH_(3))_(3)C-I+CH_(3)OH`B. `CH_(3)OH+C_(2)H_(5)I,(CH_(3))_(3)C-I+CH_(3)OH`C. `CH_(3)OH+C_(2)H_(5)I,(CH_(3))_(3)C-OH+CH_(3)I`D. `CH_(3)I+C_(2)H_(5)OH,CH_(3)I+(CH_(3))_(3)C-OH.` |
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Answer» Correct Answer - A In `CH_(3)OC_(2)H_(5)`. Attack of `I^(-)` ion occurs at `CH_(3)` group giving `CH_(3)I and C_(2)H_(5)OH.` However, in `(CH_(3))_(3)COCH_(3),` the reaction proceeds by `S_(N^(1))` mechanism and `I^(-)` ion attack more stble `(CH_(3))_(3)C^(+)` ion giving `(CH_(3))_(3)CI and CH_(3)OH`. |
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| 6. |
Preparation of alcohols from alkenes involves the electrophilic attack on alkene carbon atom. Explain its mechanism. |
| Answer» For answre, constult section 6 | |
| 7. |
Explain why is O=C=O non polar while R-O-R is polar ? |
| Answer» O=C=P i.e., `CO_(2)` molecule is of linear nature. The polarities of two C to O bonds nutually cancel out and the moelcule is of non-polar nature. On the other hand, R-O-R is a non-linear molecule with bond angle close to `110^(@)` . Since the bond polarities donot cancel out. the molecule is of polar natue. | |
| 8. |
`CH_(3)CH_(2)OH` can be converted into `CH_(3)CHO` by........... .A. catalytic hydrogenationB. treatement with `LiAIH_(4)`C. treatment with pyridinium chlorochromateD. treatement with `KMnO_(4)` |
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Answer» Correct Answer - C Controlled oxidtion of alcohols to aldehydes is carrried with the helph or pyridinium chlorochromate. |
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| 9. |
What is the correct order of reactivity of alcohols in the following reaction ? `R-OH+HCloverset(ZnCl_(2))rarrR-Cl+H_(2)O`A. `1^(@)gt2^(@)gt3^(@)`B. `1^(@)lt2^(@)lt3^(@)`C. `3^(@)gt2^(@)gt1^(@)`D. `3^(@)gt1^(@)gt2^(@)` |
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Answer» Correct Answer - C it is the correct order of reactivity |
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| 10. |
The most effective pair of reagents for the preparation of tert bytyl ethyl ehter is :A. potassium tert-bytoxide and ethyl bromideB. potassium tert-butoxide and ethanolC. sodium ethxoide and tert-butyl bromide.D. tert-butyl alcohol and ethyl bromide. |
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Answer» Correct Answer - A It is the correct answer. |
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| 11. |
Assertion : Tert- butyl methyl ether on cleavage with HI at 373 K gives tert-bytyl iodide and methano. Reason : The reaction occurs by `S_(N^(1))` mechanism.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct 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 Correct reason : The reaction proceeds by `S_(N^(1))` mechanism. |
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| 12. |
Match the items of column I with items of column II. `{:("Column I","Column II"),((a)"Antifreeze used in car engine",(I)"Neutral ferric chloride"),((b)"Solvent used in perfumes",(II)"Glycerol"),((c)"Starting meterial for picric acid",(III) "Methanol"),((d)"Wood sprit",(IV)"Phenol"),((e)"Reagent used for detection of phenolic group",(V) "Ethylene glycol"),((f)"By product of soap industry used in cosmetics",(VI)"Ethanol"):}` |
| Answer» Correct Answer - a-v ; b-vi ; c-iv ; d--iii ; e-I ; f-ii | |
| 13. |
The products formed when diethyl ether is reacted with cold HI are `:`A. Ethyl alcohol and ethyl iodideB. Ethyl iodide onlyC. Ethyl alcohol onlyD. Ethyl iodide and ethane. |
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Answer» Correct Answer - A As HI is only in limited amount. |
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| 14. |
Match the starting meterials given in Column I with the products by these (Column II) in the reaction with HI. |
| Answer» Correct Answer - a-iv ; b-v ; c-ii ; d-i | |
| 15. |
Phenol can be distinguished from ethanol by the reactions withA. `Br_(2)//water`B. NaC. Neutral `FeCI_(3)`D. All the above |
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Answer» Correct Answer - A::C Both these reagents can be used to distinguish between phenol and ethanol. |
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| 16. |
Which of the following are benzylic alcohols ?A. `C_(6)H_(5)-CH_(2)-CH_(2)OH`B. `C_(6)H_(5)CH_(2)OH`C. `C_(6)H_(5)-underset(CH_(3))underset(|)(CH)-OH`D. `C_(6)H_(5)-CH_(2)-underset(CH_(3))underset(|)(CH)-OH` |
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Answer» Correct Answer - B::C Both these alcohols are benzylic alcohols in nature. |
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| 17. |
Total number of open chain structural alcohols and ethers corresponding to molecular formula `_(4)H_(10)O` is :- |
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Answer» Six isomers are possible (i) `CH_(3)CH_(2)CH_(2)CH_(2)OH` (ii) `CH_(3)CH_(2)underset(CH_(3))underset(|)(CH) CH_(3)` `CH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)C-CH_(3)` (iv) `C_(2)H_(5)-O-C_(2)H_(5)` `CH_(3)O-C_(3)H_(7)" " ` (iv) `CH_(3)-O-underset(CH_(3))underset(|)(CH)-CH_(3)` |
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| 18. |
Ethers have less dipole moments than alcohols. Justify. |
| Answer» The dipole moment value depends upon the polarity of the bond. The C-O bound in ethers is less polar than the O-H bond is alcohols. Therefore, the dipole moments of the ethers are comparatively low. | |
| 19. |
Higher homologous of ethers can be prepared from :A. alkyl halidesB. diaamomethaneC. Grignard reagentD. None of these |
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Answer» Correct Answer - C Grignard reagents react with cholor-derivatives of ethers to from higher homolegouses `CH_(3)OCH_(3)overset(CI_(2))underset(-HCI)rarrCH_(3)OCH_(2)CIoverset(CH_(3)MgCI)rarrCH_(3)OCH_(2)CH_(3).` |
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| 20. |
An organic compound `(a)` reacts with sodium metal and forms `(b)`. On heating with conc. `H_(2)S0_(4)` (a) gives diethyl ether. `(a)` and `(b)` are respectivelyA. `C_(2)H_(5)OH and C_(2)H_(5)O Na`B. `C_(3)H_(7)OH and C_(3)H_(7)O Na`C. `CH_(3)OH and CH_(3)O Na`D. `C_(4)H_(9)OH and C_(4)H_(9)O Na` |
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Answer» Correct Answer - A `C_(2)H_(5)OH and C_(2)H_(5)O"N"a` |
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| 21. |
Which is a simple ether ?A. `C_(2)H_(5)OCH_(3)`B. `CH_(3)OCH_(3)`C. `C_(6)H_(5)OCH_(3)`D. None of these |
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Answer» Correct Answer - B Same alkyl groups are present in simple ether. |
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| 22. |
Diethyl ether is obtained from ethyl alcoholA. in the presence of `H_(2)SO_(4)` at 413 KB. in the presence of `H_(2)SO_(4)` at 470 KC. in the presence of `H_(2)SO_(4)` at 383 KD. in the presence of `H_(2)SO_(4)` at 273 K |
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Answer» Correct Answer - A Ether is formed at 413 K |
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| 23. |
Diethyl ether is prepared by passing vapours of ethyl alcohol over heated catalyst under high temperature and pressure. The catalyst is :A. `SiO_(2)`B. CuOC. `Al_(2)O_(3)`D. `Ag_(2)O` |
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Answer» Correct Answer - C Dehydration of alcohols to ethers is done with `AI_(2)O_(3)` |
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| 24. |
Assertion (A) Ethanol is a weaker acid than phenol. Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.A. Assertion and reason both are correct and reason is correct explanation of assertion.B. Assertion and reasons both are wrong statements.C. Assertion is correct statement but reasons is wrong statement.D. Assertion is wrong statement but reason is correct statement |
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Answer» Correct Answer - C Correct reason. In phenol phenate ion left after releasing proton is resonance stabilised but alkoxide is not. |
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| 25. |
Which of the following compounds will react with sodium hydroxide solution in water ?A. `C_(6)H_(5)OH`B. `C_(6)H_(5)CH_(2)OH`C. `(CH_(3))_(3)COH`D. `C_(2)H_(5)OH` |
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Answer» Correct Answer - A Only phenol will react NaOH. All other compounds are alcohols and are only weakly acidic in nature. |
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| 26. |
Phenol is less acidic thanA. ethanolB. o-nitrophenolC. o-methylphenolD. o-methoxypheno. |
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Answer» Correct Answer - B Only o-nitrophenol is more acidic than phenol due to the pressence of electron withdrawing `-NO_(2)` group. All other compounds are less acidic than phenol. |
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| 27. |
Which of the following is most acidic ?A. Benzyl alcoholB. CyclohexanolC. PhenolD. m-Chlorophenol. |
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Answer» Correct Answer - D m-Chlorophenol is most acidic because -CI atoms present at the m-position in the ring deactivates it. The release of `H^(+)` ion becomes eaiser. |
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| 28. |
Mark the correct order of decreasing acid strength of the following compounds A. `(V)gt(IV)gt(II)gt(I)gt(III)`B. `(II)gt(IV)gt(I)gt(III)gt(V)`C. `(IV)gt(V)gt(III)gt(II)gt(I)`D. `(V)gt(IV)gt(III)gt(II)gt(I).` |
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Answer» Correct Answer - B It is the correct order of decreasing acidic strength `-NO_(2)` group being electron withdrawing in nature, increasing acidic strenght. Its effect is more pronounced at the para position than at the meta position. Similarly `-OCH_(3)` group is electron releasing in nature and decreases acidic strength. its effect is more pronounced at teh para position as compared to meta position. |
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| 29. |
Arrange the following alcohols in order of reactivity towards gaseous HBr `:` A. `II gt III gtIV gt I`B. `I gt II gt III gt IV`C. `III gt II gt IV gt I`D. `I gt IV gt II gt III` |
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Answer» Correct Answer - C It is correct decreasing order. The presence of F atoms with -I effect will make the cleavage of C-OH bond easy. The releative reactivity depends upon the number of such atoms and their relative positions. Therefore (c) is the correct decreasing order of reactivity. |
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| 30. |
`underset("Ester"(A))(C_(4)H_(8)O_(2))+CH_(3)underset((2"parts"))(MgBr)overset(H_(3)O^(+))rarrunderset("Aalcohol"(B))(C_(4)H_(10)O)` The alcohol (B) reacts fastest with Luces reaent. The ester (A) and alcohol (B) are :A. (a) `CH_(3)overset(O)overset(||)COC_(2)H_(5),(CH_(3))_(3)COH`B. `Hoverset(O)overset(||)COC_(3)H_(7),(CH_(3))_(2)CHOH`C. `CH_(3)overset(O)overset(||)COC_(2)H_(5),(CH_(3))_(3)COH`D. `Hoverset(O)overset(||)COC_(3)H_(7),(CH_(3))_(2)COH` |
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Answer» Correct Answer - A Since the alcohol (B) reacts fastest with Lucas reagent, it is a tertiary alcohol. Ester of formic acid gives only secondary alcohol. Therefore , option (d) is not possible . Hence (a) is the correct answer. |
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| 31. |
An alcohol (A) on heating with concentrated `H_(2)SO_(4)` gives alkene (B) as major product and (B) can shown the geometrical isomerism . The compound (A) is `:`A. `(CH_(3))_(2) C(OH)CH(CH_(3))_(2)`B. `(CH_(3))_(2)(OH)CH_(2)CH_(3)`C. `CH_(3)CH_(2)CH(OH)CH_(3)`D. All the above. |
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Answer» Correct Answer - C It is corect answer. `CH_(3)CH_(2)underset(OH)underset(|)(CH)CH_(3)overset(H_(2SO_(4)))underset("heat")rarrCH_(3)CH=CHCH_(3)` It can exhibit geometrical isomerism. |
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| 32. |
Name the factors responsible for the solubility of alcohols in water . |
| Answer» Solubility of alcohols in water depends upon. (i) Extent of hydrogen bonding (ii) Size and number of alkyl/rayl group present. | |
| 33. |
C-O-C bond angle in ether is more than H-O-H bond angle in water although oxygen is `sp^(3)` hybridised in both the cases. Explain |
| Answer» Due to bigger size of alkyl groups, there are repulsive interactions present. | |
| 34. |
What is the structure and IUPAC name of glycerol? |
| Answer» `underset(OH)underset(|)(CH_(2))-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH_(2))` Propane -1,2,3-triol | |
| 35. |
Write the IUPAC name of the compound given below. `CH_(3)-CH_(2)-underset(CH_(3))underset(|)(C)=underset(CH_(2)OH)underset(|)(C)-OH` |
| Answer» `overset(5)CH_(3)-overset(4)CH_(2)-underset(CH_(3))underset(|)overset(3)C=underset(1)underset(CH_(2)OH)underset(|)overset(1)(C)-OH` , 3-Methylpent-2-ene-1,2-diol. | |
| 36. |
Which of the following compounds is /are aromatic alcohols ? A. A,B,C,DB. A,DC. B,CD. A |
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Answer» Correct Answer - C Both (B) and (C) are aromatic alcohols beause-OH group is present in the side chain and not directly attached to the ring. |
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| 37. |
Give IUPAC name of the compound given below. `CH_(3)-underset(CI)underset(|)CH-CH_(2)-CH_(2)-underset(OH)underset(|)CH-CH_(3)`A. 2-Chloro-5-hydroxyhexaneB. 2-Hydroxy-5-chlorohexaneC. 5- Chlorohexn-2-olD. 2-Cholorohexan-5-ol |
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Answer» Correct Answer - C It is the correct IUPAC name for the compound |
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| 38. |
Write the IUPAC name of the following compounds. (A) `CH_(3)-underset(CH_(3))underset(|)(CH)-underset(OH)underset(|)(CH)-underset(C_(2)H_(5))underset(|)(CH)-underset(OH)underset(|)(CH)-CH_(3)` (B) |
| Answer» (A) 3-Ethyl-5-methylhexane-2,4-diol (B) 1-Methoxy-3-nitrocyclohexane. | |
| 39. |
Write the IUPAC names of : (i) `(C_(2)H_(5))_(2) CHOC_(2)H_(5)` (ii) `CH_(3)CH_(2)O-CH=CH_(2)` (iii) `CH_(3)-underset(CH_(3))underset(|)(CH)-O-underset(CH_(3))underset(|)(CH)-CH_(3)` (iv) `CH_(3)O-CH_(2)-CH_(2)-OCH_(3)` (v) (vi) `CH_(3)-underset(CH_(3))underset(|)overset(O_(2)H_(5))overset(|)C-OH` (vii) `CH_(3)CH_(2)O-underset(CH_(3))(CH)-CH_(2)-CH_(3)` (viii) `CH_(3)-O-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3)` |
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Answer» (i) 3-Ethoxypentane (ii) Ethoxyethene (iii) 2-(2propoxy) propane (iv) 2-2-Dimethoxyethane (v) Ethoxybenzene (vi) 2-Ethoxypropan-2-ol (vii) 2-Ethoxybutane (viii) 1-Methoxy-2-methylbutane. |
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| 40. |
What happens when ethyl alcohol is treated with diazomethane in the presence of `HBF_(4)` ? |
| Answer» Ethy methyl ether is formed . | |
| 41. |
The reaction can be classified as:A. dehydration reactionB. Williamson alcohol synthesis reactionC. Williamson ether synthesis reactionD. Alcohol formation reaction. |
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Answer» Correct Answer - C it is the correct answer. |
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| 42. |
Which of the following is the correct method for synthesising methyl-t-butyl ether and why ? i. `(CH_(3))_(3)CBr+NaOMe rarr` ii. `CH_(3)Br+NaO-t-Bu rarr` |
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Answer» We know that nucleophilic substitution always compets with elimination. Tertiary alkyl halide preferably undergoes elimination under the reaction conditions to from alkene. Therfore, the correct method to prepare the ether is (ii) `CH_(3)BrNaOC(CH_(3))_(3)rarrunderset("Methyl tert-butyl ether")(CH_(3)-O-(CH_(3))_(3))+NaBr` |
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| 43. |
State the product formed during the reaction between sodium phenoxide and ethyl iodide on heating `:`A. PhenetoleB. Ethyl phenyl alcoholC. PhenoneD. None of these |
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Answer» Correct Answer - A `C_(6)H_(5)O"N"a+C_(2)H_(5)Ioverset(-"Nal")rarrC_(6)H_(5)OC_(2)H_(5)` |
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| 44. |
Total number of isomeric ethers chrial carbon atom in the molecular formula `C_(5)H_(12)O` is : |
| Answer» `C_(2)H_(5)-O-C_(3)H_(7),CH_(3)H_(9),CH_(3)O-underset(("Chiral"))underset(CH_(3))(CH)-C_(2)H_(5)` | |
| 45. |
30 g of `CH_(3)MgBr` reacts with excess of `CH_(3)CH_(2)CH_(2)OH` forming xg of a gas. What is the value of x? |
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Answer» `underset((=119g))(CH_(3)MgBr)+CH_(3)CH_(2)underset(OH)underset(|)(CH_(2))rarrunderset((=16g))(CH_(4)(g))+CH_(3)CH_(2)underset(OMgBr)underset(|)(CH_(2))` `119g` of `CH_(3)MgBr` evolve `CH_(4)=16 g` 30 g of `CH_(3)` MgBr evolve `CH_(4)=(30g)xx((16g))/((199g))=4g.` `:.` Value of x=4 |
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| 46. |
Complete the reaction : `CH_(3)-underset(CH_(3))underset(|)(CH_(3))-O-CH_(2)-CH_(3)overset(HI)rarr` |
| Answer» `CH_(3)-overset(CH_(3))overset(|)(CH)underset("2 Ethoxypropane")(O-CH_(2)-CH_(3))+HIrarrCH_(3)-underset("Propan-2-ol")underset(OH)underset(|)(CH)-CH_(3)+underset("Iodoethane")(CH_(3)-CH_(2))-I` | |
| 47. |
Why is boiling point of n-butyl alcohol `(118^(@)C)` higher than that of dethyl ether `(35^(@)C)` ? |
| Answer» Intermolecular hydrogen bonding is present in the molecules of alcohol but is absent in case of ether. That is why ,the boiling point n-butyl alcohol is higher than that of diethyl ether. | |
| 48. |
Which of the following is not cleaved by HI even at 525K ?A. `C_(6)H_(5)OCH_(3)`B. `C_(6)H_(5)OC_(6)H_(5)`C. `C_(6)H_(5)OC_(3)H_(7)`D. |
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Answer» Correct Answer - B Due to the greater electronegativity of the `sp^(2)` hybridised carbon atoms of the phenyl groups, the bond polarity of C-O bond is very little and it cannot be cleaved by `I^(-)` ion evne at 525 K. |
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| 49. |
Ethers are cleaved by acids and not by bases. Explain. |
| Answer» Ethers have two unshared electron pairs on the oxygen atom and are therefore, Lewis bases. They prefer to combine with acids inorder to get protonated followed by bond cleavage rather than with bases. | |
| 50. |
(A) With HI, anisole forms iodobenzene and methyl alcohol. (R ) `I^(-)` ion will combine with smaller group to avoid steric hindrance.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct 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 corect explanation for assertion . |
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