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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.
| 701. |
Accodring to Lewis concept of acids and bases, ether isA. neutralB. acidicC. basicD. amphoteric |
| Answer» Correct Answer - C | |
| 702. |
The number of bond pair and lone pair on oxygen atom in ether are respectivelyA. 1 and 2B. 2 and 1C. 2 and 2D. 1 and 3 |
| Answer» Correct Answer - C | |
| 703. |
Place the following alcohols in decreasing order of rate of dehydration with conc. `H_2SO_4` . (1)`CH_3CH_2CH(OH)CH_2CH_2CH_3` (2)`(CH_3)_2C(OH)CH_2CH_2CH_3` (3)`CH_3CH_2CH_2CH_2CH_2CH_2-OH` (4)`(CH_3)_2C(OH)CH(CH_3)_2`A. 4 gt 2 gt 1 gt 3B. 1 gt 2 gt 3 gt 4C. 4 gt 3 gt 2 gt 1D. 4 gt 3 gt 1 gt 2 |
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Answer» Correct Answer - A The alcohol 4 and 2 are `3^@` alcohol but alcohol 4 gives more substituted alkene easily. Alcohol 1 is `2^@` alcohol and alcohol 3 is `1^@` alcohol. The rate of dehydration of alcohol with concentrated `H_2SO_4` follows the order `3^@ gt 2^@ gt 1^@` |
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| 704. |
(A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.A. If both (A) and (R ) are correct and (R ) is correct explanation of (A ).B. If both (A ) and (R ) are correct but (R ) is not correct explanation of (A ).C. If (A) is correct but (R ) is incorrectD. If (A) is incorrect but (R ) is correct. |
| Answer» Correct Answer - A | |
| 705. |
(A) tert-Butyl alcohol on heating with conc. `H_(2)SO_(4)` at 413K gives 2-methyl propene as the main product and not di-tert-butyl ether. (R ) All alcohols are readily dehydrated with conc. `H_(2)SO_(4)`.A. If both (A) and (R ) are correct and (R ) is correct explanation of (A ).B. If both (A ) and (R ) are correct but (R ) is not correct explanation of (A ).C. If (A) is correct but (R ) is incorrectD. If (A) is incorrect but (R ) is correct. |
| Answer» Correct Answer - A | |
| 706. |
(A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.A. Both A and R aretrue and R is the correct explanation to AB. Both A and R are true and R is not the correct explanation to AC. A is true but R is falseD. A is false but R is true |
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Answer» Correct Answer - A |
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| 707. |
Which of the following reagents can be used to oxidise primary alcohols to aldehydes ?A. `CrO_(3)` in anhydrous mediumB. `KMnO_(4)` in acidic mediumC. Pyridinium chlorochromateD. Heat in the presence of Cu at 573 K |
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Answer» Correct Answer - A::C::D `CrO_(3)` in anhydrous medium is used to oxidise primary alcohols to aldehydes. `RCH_(2)OH overset(CrO_(3) ("anhydrous"))rarrRCHO` Acidic `KMnO_(4)` is a very strong oxidising agent. It oxidises primary alcohols into carboxylic acid. `RCH_(2)OH overset(KMnO_(4))rarrRCOOH` Pyridinium chlorochromate `(C_(6)H_(5)overset(+)(N)HClCrO_(3)^(-))` is a very good reagent for the oxidation of primary alcohols to aldehydes. When the vapours of primary alcohols are passed over heated copper at 573 K, dehydrogenation takes place and an aldehyde is formed. `RCH_(2)OH underset(573K)overset(Cu)rarrRCHO` |
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| 708. |
Which of the following reagents can be used to oxidise primary alcohols to aldehydes ?A. `CrO_(3)` in anhydrous medium .B. `KMnO_(4)` in acidic mediumC. Pyridinium chlorochromate .D. Heat in the presence of Cu at 573 K . |
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Answer» Correct Answer - B `KMnO_4` will oxidise initially formed aldehyds to carboxydic acids. |
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| 709. |
Which one of the following reagents is used to reduce an aldehyde to primary alcohols ?A. `N_(2)H_(4)//KOH`B. `Zn//Hg` and conc. HClC. Alkaline `CuSO_(4)` containing Rochelle saltD. `LiAlH_(4)` |
| Answer» Correct Answer - D | |
| 710. |
0.037g of an alcohol, R-OH was added to `CH_(3)MgBr` and the gas evolved measured 11.2 mL at STP. The Molecular mass of R-OH will be .A. 47B. 79C. 74D. 77 |
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Answer» Correct Answer - C [Hint] `{:(R-OH,+,CH_(3)MgBr,rarr,CH_(4),+,Mg(Br)OR),(1 mol,,,,1 mol,,),(,,,,or,,),(,,,,22400 "mL at STP",,):}` ltBRgt 11.2 Ml `ch_(4)` at STP is formed by 0.037 g ROH `:. ` 22400 mL `CH_(4)` at STP will be formed by `(0.037)/(11.2)xx22400`g ROH =74 g ROH `:. `Molar mass of R-OH `=74` |
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| 711. |
0.037g of an alcohol, R-OH was added to `CH_(3)MgBr` and the gas evolved measured 11.2 mL at STP. The Molecular mass of R-OH will be . |
| Answer» Correct Answer - `C_(4)H_(9)-OH` | |
| 712. |
The most suitable reagent to convert primary alcohol to aldehydeA. acidified `K_2Cr_2O_7`B. alkaline `KMnO_4 `C. `CrO_3`D. pyridinium chlorochromate (PCC) |
| Answer» Correct Answer - D | |
| 713. |
Complete the missing links . `A overset(CH_(3) MgBr)(to) B overset(H_(3)O^(+))(to) C`A. `CH_3COCH_3 (CH_3)COMgBr, (CH_3)_3COH`B. `CH_3COOH, (CH_3)CHOMgBr, CH_3CH_2OH`C. `(CH_3COO)_2Ca, CH_3CH_2OMgBr, CH_2underset(OH)underset(|)"CH"-CH_3`D. `CH_3COOCH_3, (CH_3)_3COMgBr,CH_3-underset(OH)underset(|)"CH"-CH_3` |
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Answer» Correct Answer - A `underset((A))(CH_3COCH_3)overset(CHMgBr)rarrCH_3-underset(underset((B))(CH_3))underset(|)overset(CH_3)overset(|)C-OMgBroverset(H_3O^+)rarrCH_3-underset(underset((A))(CH_3))underset(|)overset(CH_3)overset(|)C-OH` |
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| 714. |
0.44g of a monohydric alcohol when added to `CH_(3)MgI` in ether librates at STP, 112`cm^(3)` of methane. With PCC the same alcohol forms a carbonyl compound that answer silver mirror test. The monohydric alcohol is `:`A. `CH_(3)-underset(OH)underset(|)(C)H-CH_(2)-CH_(3)`B. `(CH_(3))_(3)C-CH_(2)OH`C. `CH_(30-underset(OH)underset(|)(C )H-CH_(2)CH_(2)CH_(3)`D. `(CH_(3))_(2)CH-CH_(3)OH` |
| Answer» Correct Answer - B | |
| 715. |
Ethyl acetate reacts with excess of `CH_(3)MgBr` to form `:`A. B. C. D. |
| Answer» Correct Answer - C | |
| 716. |
`+CH_(3)MgBr overset("Ether")(rarr)(A)overset(H_(3)O^(+))(rarr)(B)` The IUPAC name of (B) is `:`A. 3-methylbutan-2-olB. 2-methylbutan-3-olC. 2-methylbutan-2-olD. pentan-2-ol |
| Answer» Correct Answer - A | |
| 717. |
`CH_(3)COOC_(2)H_(5` with excess of `C_(2)H_(5)MgBr` and hydrolysis givesA. HCOOHB. `C_(2)H_(5)COC_(2)H_(5)`C. `(CH_(3))_(3)COH`D. `(C_(2)H_(5))_(3)COH` |
| Answer» Correct Answer - D | |
| 718. |
Which one of the following is most acidic ?A. `Cl-CH_(2)-CH_(2)OH` |
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Answer» Correct Answer - B Ortho-nitrophenol is most acidic because in it, `-NO_(2)` (electron attracting group) is attached at ortho-position which helps in stabilising the negative charge on the oxygen of phenoxide ion. Hence, due to this reason, acidic character of phenol is increased, while on attachment of `-CH_(3)` group (electron donating group ) acidic strength of phenol is decreased in cresol due to the destabilisation of phenoxide in. |
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| 719. |
Which one of the following compounds will not react with `CH_(3)MgBr`?A. Ethyl acetateB. AcetoneC. Dimethyl etherD. Ethanal |
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Answer» Correct Answer - C Grignard reagent (RMgX) reacts with only those compounds which contains acidic hydrogen or which contains carbonyl group. Dimethyl ether `(CH_(3)OCH_(3))` due to absence of both acidic hydrogen and carbonyl group does not react with Grignard reagent. |
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| 720. |
The best method to prepare cyclohexene from cyclochexanol is by usingA. Conc.`HCI+ZnCI_(2)`B. Conc.`H_(3)PO_(4)`C. `HBr`D. Conc.`HCI` |
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Answer» Correct Answer - B Conc. `HCI, HBr` and conc. `HCI +ZnCI_(2)` all are nucleophiles thus convert alcohols to alky`1` halides. However, conc. `H_(3)PO_(4)` is a good dehydrating agent which converts and alcohol to an alkene. |
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| 721. |
`underset(OH)underset(|)(CH_(2)=CHCHCH_(2)CH_(2)OH)overset(MnO_(2))rarrA,A` isA. `CH_(2)=Chunderset(O)underset(||)C CH_(2)CH_(2)OH`B. `CH_(2)=Chunderset(OH)underset("| ")"CH"CH_(2)CHO`C. `CH_(2)=Chunderset(O)underset(||)C CH_(2)CHO`D. `CH_(2)=Chunderset(O)underset(||)C CH_(2)overset(O)overset(||)COH` |
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Answer» Correct Answer - A There is oxidation of alcohol at allylic or benzylic position by `MnO_(2).` |
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| 722. |
The best method to prepare cyclohexene from cyclohexanol is by usingA. conc. `HCl+ZnCl_(2)`B. conc. `H_(3)PO_(4)`C. `HBr`D. conc. HCl |
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Answer» Correct Answer - B The best method to prepare cyclohexene from cyclohexanol is by conc. `H_(3)PO_(4)` because in the given options dehydrating agent is conc. `H_(3)PO_(4)`. |
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| 723. |
Among the following compounds which can be dehydrated very easily is-A. `CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)OH`B. `CH_(3)CH_(2)CH_(2)overset(OH)overset("| ")"CH"CH_(3)`C. `CH_(3)CH_(2)overset(CH_(3))overset("| ")underset(OH)underset("| ")"CC"H_(2)CH_(3)`D. `CH_(3)CH_(2)underset(CH_(3))underset("| ")"CH"CH_(2)CH_(2)OH` |
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Answer» Correct Answer - C Dehydration of alcohol is in order `1^(@) lt 2^(@) lt 3^(@)` Thus, (c) a `3^(@)` alcohol is dehydrated very easily. |
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| 724. |
In the following reaction which bonds are cleaved? `CH_(3)CH_(2)-overset(O)overset(||)underset("I")Ooverset(q)overset(darr)-Ooverset(p)overset(darr)-H+CH_(3)CH_(2)overset(s)overset(darr)underset("II")-Ooverset(r)overset(darr)-H`A. bond p of I and s of IIB. bond q of I and r of IIC. bond p of I and r of IID. bond q of I and s of II |
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Answer» Correct Answer - B `CH_(3)CH_(2)-overset(O)overset(||)C-O-H+CH_(3)CH_(2)-overset(18)O-H` `" "CH_(3)CH_(2)overset(O)overset(||)C-overset(darr)overset(18)O-CH_(2)CH_(3)+H_(2)O` If oxygen of `CH_(3)CH_(2)OH` is labelled with `.^(18)O,` then it goes with ester formed, indicating cleavage of bond q in l and r in II. |
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| 725. |
(A) Oxirane are cleaved under acidic and basic conditions. (R ) The oxirane ring is strained and the tetrahedral bond angle `(109.5^(@))` is distorted t0 `61.5^(@)`.A. If both (A) and (R ) are correct and (R ) is correct explanation of (A ).B. If both (A ) and (R ) are correct but (R ) is not correct explanation of (A ).C. If (A) is correct but (R ) is incorrectD. If (A) is incorrect but (R ) is correct. |
| Answer» Correct Answer - B | |
| 726. |
Among the following, which is least acidic ?A. p-nitrophenol `lt `p-fluorophenol `lt `p-p - cholorophenolB. cp-ChlorophenolC. PhenolD. o-Cresol |
| Answer» Correct Answer - D | |
| 727. |
Phenol is heated with a solution of mixture of `KBr` and `KBrO_(3)`. The major product obtained in the above reaction isA. 2-BromophenolB. 3-BromophenolC. 4-BromophenolD. 2, 4,6-Tribromophenol |
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Answer» Correct Answer - D |
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| 728. |
Phenol is heated with a solution of mixture of `KBr` and `KBrO_(3)`. The major product obtained in the above reaction isA. 2-bromophenolB. 3-bromophenolC. 4-bromophenolD. 2,4,6-tribromophenol |
| Answer» Correct Answer - d | |
| 729. |
Consider the following reaction ethanol `overset(PBr_(3))(rarr)Xoverset(alc.KOH)(rarr)Yoverset((i)H_(2)SO_(4),"room temp".)underset((ii)H_(2)O,heat)(rarr)Z` the product `Z` isA. `CH_(3)CH_(2)OH`B. `CH_(2)=CH_(2)`C. `CH_(3)CH_(2)-O-CH_(2)-CH_(3)`D. `CH_(3)-CH_(2)-O-SO_(3)H` |
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Answer» Correct Answer - A `CH_(3)CH_(2)Ohoverset(PBr_(3))rarr CH_(3)CH_(2)Br` `overset(KOH alc.)rarr CH_(3)CHO overset(H_(2)SO_(4))underset(H_(2)O,Delta)rarr CH_(3)CH_(2)OH` |
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| 730. |
Ethers reacts with cold and concentrated H2SO4 to form A. oxonium salt B. alkene C. alkoxides D. alcohols |
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Answer» Correct answer is A. oxonium salt |
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| 731. |
When phenol is heated with cone. HNO3 in presence of cone. H2SO4 it yields :(a) o-nitrophenol (b) p-nitrophenol (c) 2, 4, 6-trinitrophenol (d) m-nitrophenol |
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Answer» Option : (c) 2, 4, 6-trinitrophenol |
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| 732. |
In phenol carbon atom attached to -OH group undergoes –(a) sp3 -hybridisation (b) sp-hybridisation (c) sp2 -hybridisation (d) No hybridisation |
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Answer» Option : (c) sp2 -hybridisation |
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| 733. |
Which of the following alcohols will dehydrate most rapidly when treatment with conc. `H_(2)SO_(4)` ?A. `CH_(3)-overset(OH)overset(|)(C)H-overset(CH_(3))overset(|)(C)-CH_(3)`B. `CH_(3)-underset(CH_(3))underset(|)(C)H-underset(OH)underset(|)(C)H-CH_(3)`C. `CH_(3)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-underset(CH_(3))underset(|)(C)H-CH_(3)`D. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-OH` |
| Answer» Correct Answer - C | |
| 734. |
In glycerol molecule, there is `//` are `:`A. one primary alcoholic groupsB. one secondary groupC. two secondary alcoholic groupsD. two primary and one secondary alcoholic groups |
| Answer» Correct Answer - D | |
| 735. |
The alcoohol which forms fats with fatty acids is `:`A. ethanolB. methanolC. isopropyl alcoholD. glycerol |
| Answer» Correct Answer - D | |
| 736. |
Halogenation of anisole is carried in the presence of catalystA. `FeCl_3`B. `AlCl_3`C. `BF_3`D. `CH_3COOH` |
| Answer» Correct Answer - D | |
| 737. |
The reagent used to convert `RCOOHrarr RCH_(2)OH` isA. `NaBH_(4)`B. Ethylene oxideC. `Zn//Hg-HC1`D. `LiA1H_(4)` |
| Answer» Correct Answer - D | |
| 738. |
`R-CH_(2)-CH_(2)OH` can be converted into `RCH_(2)CH_(2)COOH` the correct sequence of reagent is:A. `PBr_(3),KCN , H_(3)O^(+)`B. `PBr_(3),KCN,H_(2)//P^(+)`C. `KCN,H_(3)O^(+)`D. `HCN,PBr_(3),H_(3)O^(+)` |
| Answer» Correct Answer - A | |
| 739. |
P- cresol react with chloroform in alkaline medium to give compound `(A)` which adds `HCN` to form `(B)`. The latter on acidic hydrolysis gives chiral carboxylic acid. The structure of carboxylic acid is :A. B. C. D. |
| Answer» Correct Answer - B | |
| 740. |
Absolute alcohol cannot be obtained by simple fractional distillation becauseA. pure `C_(2)H_(5)OH` is unstableB. `C_(2)H_(5)OH` forms chemical bonding with waterC. oxidationD. it forms azeotropic mixture with water |
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Answer» Correct Answer - D |
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| 741. |
Assertion: `p`-nitrophenol is a stronger acid than `o`-nitrophenol. Reason: Intramolecular hydrogen bonding makes the `o`-isomer weaker than the `p-`isomer.A. If both (A) and (R ) are correct and (R ) is correct explanation of (A ).B. If both (A ) and (R ) are correct but (R ) is not correct explanation of (A ).C. If (A) is correct but (R ) is incorrectD. If (A) is incorrect but (R ) is correct. |
| Answer» Correct Answer - A | |
| 742. |
Intramolecular hydrogen bonding is found in `:`A. phenolB. p-nitrophenolC. m-nitrophenolD. o-nitrophenol |
| Answer» Correct Answer - D | |
| 743. |
What is the function of diethyl ether in the preparation of Grignard reagent ?A. To act as a catalystB. To act as a solventC. To provide lone pair of electrons for coordinationD. To act as an acid |
| Answer» Correct Answer - B,C | |
| 744. |
Which among the following compounds will give a secondary alcohol on reacting with Grignard reagent followed by acid hydrolysis ? (i) HCHO (ii) `C_(2)H_(5)CHO` (iii) `CH_(3)COCH_(3)` (iv) `HCOOC_(2)H_(5)` Select the correct anwer using the codes given below `:`A. (ii) onlyB. (iii) onlyC. (i) and (iv)D. (ii) and (iv) |
| Answer» Correct Answer - D | |
| 745. |
Which of the following alcohol (s) can be prepared by the action of Grignard reagents with aldehydes ?A. Primary alcoholB. Secondary alcoholsC. Tertiary alcoholsD. Both primary and tertiary alcohols |
| Answer» Correct Answer - A,B | |
| 746. |
(A) Grignard reagent reacts with aldehydes and ketones to form alcohol. (R ) Alcohols have acidic hydrogen.A. If both (A) and (R ) are correct and (R ) is correct explanation of (A ).B. If both (A ) and (R ) are correct but (R ) is not correct explanation of (A ).C. If (A) is correct but (R ) is incorrectD. If (A) is incorrect but (R ) is correct. |
| Answer» Correct Answer - A | |
| 747. |
Alcohols react with Grignard reagent to formA. AlkanesB. AlkenesC. AlkynesD. All of these |
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Answer» Correct Answer - A `underset("Methy alochol")(CH_(3)-O-H+)underset("Ethyl magnesium bromide")(C_(2)H_(5)MgBr rarr)underset("Ethane")(C_(2)H_(6)+Mg)overset(Br)underset(OCH_(3))to` |
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| 748. |
IUPAC name of the following compound is A. cyclohexa -1,3-dien-3-olB. cyclohexa -1, 2-dien-1-olC. cydohexa -1, 3-dien-3-olD. cyclohexa -1, 5-dien-1-ol |
| Answer» Correct Answer - D | |
| 749. |
IUPAC name of secondary butyl alcohol isA. 2-methylpropan-1-olB. butan-2-olC. 2-methylpropan-2-olD. butan-1-ol |
| Answer» Correct Answer - B | |
| 750. |
Secondary butyl alcohol is dehydrated according toA. Saytzeff ruleB. Markownikoff ruleC. Anti-Markownikoff ruleD. none of these |
| Answer» Correct Answer - A | |