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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. |
An organic compound [A] is `C_(5)H_(8)O_(3).`On heating with soda lime, it gives [B]. The compound [B] reacts with HCN to give another compound [C] which reacts with thionyl chloride to produce [D]. When the compound [A] is heated with potassium dichromate the product is acetic acid and malonic acid. The structure of compound [A] is :A. `CH_(3)-CH_(2)-overset(O)overset(||)C-CH_(2)COOH`B. `CH_(3)CH_(2)underset(OH)underset(|)CHCH_(2)COOH`C. `CH_(3)overset(O)overset(||)C"C"H_(2)CH_(2)COOH`D. `CH_(3)CH_(2)underset(OH)underset(|)CHCOOH` |
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Answer» Correct Answer - A (a) As the compound [A] upon oxidation gives `CH_(3)COOH" and "H_(2)C(COOH)_(2),` the structure (a) is the correct structure. |
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| 2. |
An organic compound [A] is `C_(5)H_(8)O_(3).`On heating with soda lime, it gives [B]. The compound [B] reacts with HCN to give another compound [C] which reacts with thionyl chloride to produce [D]. When the compound [A] is heated with potassium dichromate the product is acetic acid and malonic acid. The compound [A] is aA. `alpha`-hydroxy acidB. `beta`-hydroxy esterC. `beta`-keto acidD. `beta`-keto ester. |
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Answer» Correct Answer - A (a) The compound [A] is a `beta`-keto acid. |
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| 3. |
Assign a suitable structure to `C_(6)H_(8)O_(2)` that can give iodoform test and white trubidity with Lucas reagent on heating. |
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Answer» Since the compound can give iodoform test, it must have a `CH_(3)CO` group and also a primary alcoholic group `(-CH_(2)OH)` because it gives white turbidity on heating with Lucas reagent. The structure of the compound is : `CH_(3)-overset(O)overset(||)C-CH_(2)-CH_(2)-OH` : 4-Hydroxybutan-2-one |
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| 4. |
An organic compound [A] is `C_(5)H_(8)O_(3).`On heating with soda lime, it gives [B]. The compound [B] reacts with HCN to give another compound [C] which reacts with thionyl chloride to produce [D]. When the compound [A] is heated with potassium dichromate the product is acetic acid and malonic acid. The IUPAC name of compound [B] is :A. Butan-2-eneB. Pentan-3-eneC. Pentanoic acidD. Ethanoic acid. |
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Answer» Correct Answer - A (a) Butan-2-one [B] is formed when 3-keto pentanoic acid is sbujected to decarboxylation by soda lime. `underset([A])underset()(CH_(3)CH_(2))-overset(O)overset(||)C-CH_(2)COOHoverset(NaOH//CaO)underset("Fuse")rarrunderset([B])underset()(CH_(3)CH_(2))-overset(O)overset(||)C-CH_(3)` |
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| 5. |
and find out the reagent `(A)` from the following :A. `BrCH=CHCH_3`B. `CH_2=CHCH_2 Br`C. `(CH_(2)-overset(Br)overset(|)(C)-CH_(3))`D. All |
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Answer» Correct Answer - B Allyl bromide is more reactive. |
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| 6. |
The decreasing order of ease of hydrolysis of the following esters is : (I) `MeCOOPh` (II) (III) (IV) .A. `(II) gt (I) gt (IV) gt (III)`B. `(I) gt (II) gt (III) gt (IV)`C. `(III) gt (IV) gt (I) gt (II)`D. `(IV) gt (III) gt (II) gt (I)` |
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Answer» Correct Answer - A More `EWG` favours acyl substitution or hydrolysis of acid derivative. `II [(-NO_2),(-I)`, and `(-R)], gt (I) [(Ph),(-I)`, and` (+R), ("Standard")] gt (IV) [Me,(+I)` and `H.C.]gt (III) [("Ome"(-I)` and `(-R)`, net more `EDG` than (IV)]. |
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| 7. |
Acid-catalysed estrification of a carboxylic acid is shown below. (i) What special name is given to this esterification reaction? (ii) Trace the position of `O^(18)` of benzoic acid in the products formed. (iii) Acid catalysed esterification is a substitution at the carbonyl carbon or at the oxygen of OH. Explain |
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Answer» (i) lt is Fischer esterification. (ii) `O^(18)` in `H_(2)O` (iii) a substitution of-OH group of-COOH and H-atom of the alcohol. Thus, `R-overset(O)overset(||)C-OH+H-OC_(2)H_(5)overset(H_(3)O^(+))toR-overset(O)overset(||)C-OC_(2)H_(5)+H_(2)O` |
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| 8. |
Arrange the following in decreasing order of acid catalysed estrification: `CH_(3)CH_(2)COOH, (CH_(3))_(2)CHCOOH,(CH_(3))_(2)"CC"OOH` |
| Answer» `CH_(3)CH_(2)COOHgt(CH_(3))_(2)CHCOOHgt(CH_(3))_(2)"CC"OOH` | |
| 9. |
Carboxylic acids having at least one `alpha`-hydrogen react with `Cl_(2)" or "Br_(2)` in the presnence of red phosphorus to give `alpha`-halo acids. The reaction is known as H.V.Z. reaction. The HVZ reaction is limited to the formation of `alpha`-chloro acid and `alpha`-bromo acid and it is sometimes difficult to carry out the reaction. Answer the following questions : Which of the following carboxylic acids will not give HVZ reaction ?A. `CH_(3)COOH`B. `CH_(3)-overset(CH_(3))overset(|)CH-COOH`C. `CH_(3)-CH_(2)-COOH`D. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-COOH` |
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Answer» Correct Answer - D (d) The acid has no `alpha`-hydrogen atom. |
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| 10. |
Assertion : Although fluorine is more electronegative than chlorine, p-chlorobenzoic acid is a stronger acid than p-fluorobenzoic acid. Reason : Due to mathcing size of 2p-orbitals of F and C, F has stronger +R effect than Cl.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 explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason are both incorrect. |
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Answer» Correct Answer - A (a) Reason is correct explanation for assertion |
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| 11. |
Arrange the following in order of increasing acidic strength (i) `HCOOH,ClCH_(2)COOH,CH_(3)COOH` (ii) `CH_(3)COOH,(CH_(3))_(2)CHCOOH,(CH_(3))_(3)CCOOH` (iii) `ClCH_(2)COOH,Cl_(2)CHCOOH,ClCl_(3)C.COOH` (iv)`ClCH_(2)COOH,CH_(3)CH_(2)COOH,ClCH_(2)CH_(2)COOH,(CH_(3))_(2)CH.COOH,CH_(3)COOH.` |
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Answer» (i) `CH_(3)COOHltHCOOHltClCH_(2)COOH` (ii) `(CH_(3))_(3)C.COOHlt(CH_(3))_(2)CHCOOHltCH_(3)COOH` (iii) `ClCH_(2)COOHltCl_(2)CHCOOHltCl_(3)"C"COOH` (iv) `(CH_(3))_(2)CHCOOHltCH_(3)CH_(2)COOHltCH_(3)COOHltClCH_(2)CH_(2)COOHltClCH_(2)COOH` |
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| 12. |
List three reagents for converting a carboxylic acid to its acyl chloride. Select the most convenient of the three reagents. Give a reason for the choice. ? |
| Answer» `PCl_(3), SOCl_(2) and PCl_(5), SOCl_(2)` is the best reagent because the products of the reaction besides acyl chloride are `SO_(2)` and HCl which are gases and easily separated | |
| 13. |
Assertion: Both `HCOOH (I)` and `CH_3 COOH (II)` give precipitate with aqueous `AgNO_3` solution soluble in `HNO_3`. Reason: `HCOOH` gives positive Tollens test.A. If both `(A)` are `( R)` are true and `( R)` is the correct explanation of `(A)`.B. If both `(A)` and `( R)` are true but `( R)` is not the correct explanation of `(A)`.C. If `(A)` is true but `( R)` is false.D. If `(A)` is false but `( R)` is true. |
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Answer» Correct Answer - B Both form silver salt `(RCOO Ag)`, soluble in `HNO_3`. `HCOOH` gives positive Tollens test. |
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| 14. |
`CH_3 CH=CHCHO` is oxidised to `CH_3 CH=CHCOOH` using :A. Alkaline `KMnO_4`B. Selenium dioxideC. Ammoniacal `AgNO_3`D. All |
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Answer» Correct Answer - D Tollens reagent oxidises `CHO` to `COOH` without affecting the `(C=C)` bond. |
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| 15. |
Complete the following reaction sequence : `CH_(3)-overset(O)overset(||)C-CH_(3)overset((i)CH_(3)MgBr)underset((ii)H_(2)O)rarr(A)overset("Na metal")underset("ether")rarr(B)overset(CH_(3)-Br)rarr(C)` |
| Answer» `underset("Propanone")underset()(CH_(3)-overset(O)overset(||)C-CH_(3))overset((i)CH_(3)MgBr)underset((ii)H_(2)O)rarrunderset((A))underset("2-Methylpropan-2-01")underset()(CH_(3)-overset(OH)overset(|)underset(CH_(3))underset(|)C-CH_(3))overset("Na metal")underset("ether")rarrunderset("Sod.salt"(B))underset()underset()(CH_(3)-overset(overset(-)ONa^(+))overset(|)underset(CH_(3))underset(|)(C-CH_(3))overset(CH_(3)Br)rarr)underset((C))underset("2-Methoxy-2-methylpropane")underset()(CH_(3)-overset(OCH_(3))overset(|)underset(CH_(3))underset(|)C-CH_(3))` | |
| 16. |
The intermediates formed during the reaction of `R-overset(O)overset(||)C-NH_(2)` with `Br_(2)` and KOH are :A. `RCONHBr" and "RNCO`B. `RNHCOBr" and "RNCO`C. `RNHBR" and "RCONHBr`D. `RCONH_(2)` |
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Answer» Correct Answer - A (a) RCONHBr and RNCO are formed. |
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| 17. |
How will you convert ethyl cyanide to ethanoic acid ? |
| Answer» `underset("Ethyl cyanide")underset()(CH_(3)CH_(2)C)equivNoverset(H_(2)O"/"H^(+))underset("Partial")rarrunderset("Propionamide")underset()(CH_(3)CH_(2)CONH_(2))overset(Br_(2)//KOH)rarrunderset("Ethylamine")underset()(CH_(3)CH_(2)NH_(2))overset(HONO)rarrunderset("Ethyl alcohol")underset()(CH_(3)CH_(2)OH)overset(KMnO_(4))underset(("Oxidation"))rarrunderset("Ethanoic acid")underset()(CH_(3)COOH)` | |
| 18. |
Distinguish between the following : (a) `MeCOCl` (ethanoyl chloride) and `(II) MeCOOH` (ethanoic acid) (b) `(I) MeCOOEt` (ethyl acetate) and `(II) MeCONH_2` (ethanamide) ( c) `(I) Ac_2O` (acetic anhydride) and `(II) MeCOOMe` (methyl acetate) (d) (I) `Me-overset(O)overset(||)underset(O)underset(||)(S)-NH-Me` (N-methyl metane sulphonamide) and (II) `MeCONHMe` (N-methyl ethanamide) (e) `(I) Me-C -= N` (ethane nitrile) and `(II) MeCOOEt` (ethyl acetate). |
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Answer» (a) `(I)` on hydrolysis with `H_2 O` releases `Cl^(Ө)` which with `AgNO_3` forms white precipitate of `AgCl` insoluble in `HNO_3`. `(II)` with `AgNO_3` also forms a white precipitate of `RCOO^(Ө) Na^(oplus)`, whereas `(II)` emits odorous `HN_3`. ( b) `(I)` saponifies with `NaOH` to give `EtOH` and `MeCOO^(Ө) Na^(oplus)`, whereas `(II)` emits odorous `NH_3` when heated with aq. `NaOH`. ( c) `(I)` is hydrolysed on warming with `H_2 O` to `CH_3 COOH` and gives acid test with litmus paper. Under these conditions, `(II)` is not hydrolysed. (d) `(I)` dissolves in aqueous `NaOH` and forms `[MeSO_2 NMe]^(Ө) Na^(oplus)`, whereas the corresponding `H` in `(II)` is not so acidic to react with `NaOH`. ( e) Basic hydrolysis of `(I)` gives `NH_3`. |
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| 19. |
`underset((A))(PhCOOH)underset(underset((ii)Ag_(2)O //Pt//MeOH)((ii)CH_(2)N_(2)))overset((i)SOCI_(2))rarr (B)` Product `(B)` is :A. `PhCONH_2`B. `PhCH_2 COOH`C. `PhCH_2 COOMe`D. `PhCONHMe` |
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Answer» Correct Answer - C Arndt-Eistert reaction . The product `PhCH=C=O` (ketone) reacts with `MeOH` to give ester `(PhCH_2 COOMe)` (step up by one `C` atom). |
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| 20. |
`underset((A)) (PhCONH_2) underset(KOBr)rarr (B) underset(MeOH)rarr (C)` Product is `( C)` is :A. `PhNH_2`B. `PhNHCOOMe`C. `PhNHCOOPh`D. None |
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Answer» Correct Answer - B Hofmann bromamide reactions. The product `(Ph-N-C=O)` reacts with `MeOH` to give urethane `(Ph-NH-COOMe)`. |
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| 21. |
Complete the following sequence of reactions with appropriate structures. `CH_(3) -CH_(2) -COOH overset(P and ) underset("Bromide") rarr (A)` `(A) overset((i) Alc. KOH (excess)) underset((ii) H^(oplus))rarr (B)`. |
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Answer» `CH_(3)CH_(2)COOHoverset(Br_(2)+P)underset(underset("reaction")(H.V.Z.))(rarr)CH_(3)overset(Br)overset(|)(CH)underset((A))(-COOH)` `Alc KOH//H^(oplus) darr-HBr` `CH_2 = underset(underset("Acrylic Acid")((B)))(CH_(2) = CH-COOH)`. |
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| 22. |
Complete the following set of reactions: (i) Urea + `NH_(2)-NH_(2)underset("Amyl alcohol")overset(383 K)to()+NH_(3)` (ii) Urea + `HNO_(3)to(B)overset(conc. H_(2)SO_(4))to(C )+H_(2)O,(C )underset([H])overset(Zn//CH_(3)COOH)to(D)` |
| Answer» `underset("Semicarbazide")((A)toNH_(2)-overset(O)overset(||)C-NH-NH_(2)),(B)to[underset("Urea nitrate")(NH_(2)-overset(OH)overset(|)C-NH_(2))]NO_(3)^(-),underset("Nitrourea")((C )toNH_(2)-overset(O)overset(||)C-NH-NO_(2)),(D)tounderset("Semicarbazide")(NH_(2)-overset(O)overset(||)C-NH-NH_(2))` | |
| 23. |
Assertion (A) Formaldehyde is a planar molecule. Reason (R) It contains `sp^(2)` hybridised carbon atom.A. Assertion and reason both are correct and reason is correct explanation of assertion.B. Assertion and reason both are wrong statements.C. Assertion is correct statement but reason is wrong statement.D. Assertion is wrong statement but reason is correct statement. |
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Answer» Correct Answer - A (a) Reason is the correct explanation for assertion. |
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| 24. |
The compound that undergoes decarboxylation most readily under mild condition isA. B. C. D. |
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Answer» Correct Answer - B (b) `beta`-ketoacids undergo decarboxylation most readily. |
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| 25. |
Carboxylic acids undergo ionisation due toA. hydrogen bondingB. absence of `alpha`-hydrogenC. high reactivity of `alpha` -hydrogenD. resonance stabilization of carboxylate ion |
| Answer» Resonance energy of carboxylate ion is much higher than that of undissociated acid | |
| 26. |
Which is the strongest acid ?A. `CH_(3)OH`B. `CH_(3)CH_(2)OH`C. `C_(6)H_(5)COOH`D. `C_(6)H_(5)SO_(3)H.` |
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Answer» Correct Answer - C (c) `C_(6)H_(5)COOH` is the strongest acid |
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| 27. |
What of the following is expected to be most highly ionised in water ?A. `CH_2 ClCH_2 CH_2 COOH`B. `CH_3 CHClCH_2 COOH`C. `CH_3CH_2 C Cl_2 COOH`D. `CH_3CH_2 CHClCOOH` |
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Answer» Correct Answer - C The most acidic compound is more ionised in `H_2 O`. Aslo, `( c)` is most acidic compound due to `(-I)` effect of `2 Cl` on `alpha-C`. |
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| 28. |
Compound (A) `(C_(6)H_(12)O_(2))` on reduction with `LiAlH_(4)` yielded two compounds (B) and (C ). The compound (B) on oxidation gave (D), which on treatment with aqueous alkail and subsequent heating furnished (E ). The latter on catalytic hydrogenation gave (C ). The compound (D) was oxidised further to give (F) which was found to be a monobasic acid (molecular formula weight `= 60.0`). Deduce the structures of (A), (B), (C ), (D), and (E ). |
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Answer» The compound (F) has molecular mass 60. RCOOH=R+45=60orR=15,i.e., `CH_(3)` Hence, the compound (F) is `CH_(3)COOH`. lt is obtained by oxidation of (D). Thus, (D) is `CH_(3)CHO`. (D) is formed by oxidation of (B). Hence, (B) is `CH_(3)CH_(2)OH`. (D) undergoes aldol condensation which subsequently forms (E) on heating. `underset((D))(2CH_(3)CHO)toCH_(3)-underset(OH)underset(|)"CH"-CH_(2)CHOoverset("Heating")toCH_(3)CH=underset((E))(CHCHO)overset(H)tounderset((C))(CH_(3)CH_(2)CH_(2)CH_(2)OH)` (A) is, thus an ester which forms two alcohols with `LiAlH_(4)` `underset(or)(CH_(3)CH_(2)CH_(2)COOCH_(2)CH_(3))overset(LiAlH_(4))tounderset((C))(CH_(3)CH_(2)CH_(2)CH_(2)OH)+underset((B))(CH_(3)CH_(2)OH)` `CH_(3)COOCH_(2)CH_(2)CH_(2)CH_(3)` |
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| 29. |
One mole of an organic amide (A) on alkaline hydrolysis gives one mole of `NH_(3)` and one mole of a monobasic acid of equivalent mass 74. What is the molecular mass of (A) ? |
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Answer» `R-overset(O)overset(||)C-NH_(2)+OH^(-)toR-overset(O)overset(||)C-O^(-)+NH_(3)` R+45=74orR=29i.e., `CH_(3)CH_(2)-` Monobsic acid=`CH_(3)CH_(2)COOH,` Mol. Mass=`CH_(3)CH_(2)CONH_(2)=73` |
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| 30. |
Which of the following reactions is/are correct ?A. B. C. D. |
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Answer» Correct Answer - B::C Reactant in `(d)` gives only one compound. |
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| 31. |
Which of the following reactions are correct ?A. B. C. D. |
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Answer» Correct Answer - A::C::D `NaBH_4` does not react with ester. |
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| 32. |
How will you convert benzoic acid into benzene ? |
| Answer» Correct Answer - A | |
| 33. |
Completely anhydrous acetic acid has molecular mass of 120. Explain. |
| Answer» In the vapour state, acetic acid exists as a dimer due to intermolecular hydrogen bonding. Therefore, its molecular mass is 120. | |
| 34. |
Why does not formic acid form an anhydride upon heating? |
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Answer» Upon heating, formic acid loses a molecule of `H_(2)O` and gets dehydrated to give CO. Therefore, it does not form anhydride upon heating. `HCOOHoverset("Heat")rarrH_(2)O+CO` |
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| 35. |
m-Hydroxybenzoic acid is a stronger acid than benzoic acid while p-hydroxybenzoic acid is weaker. Explain. |
| Answer» The hydroxyl (OH) group has both-I effect and +R effect. Whereas the former helps in the release of `H^(+)` from the carboxyl group, the latter tends to oppose the same because of resonance. At the para position, the +R effect dominates the -I effect. Therefore, p-hydroxybenzoic acid is a weaker aid `(K_(a)=2.5xx10^(-5))` than benzoic acid `(K_(a)=6.3xx10^(-5))`. But in case of m-hydroxybenzoic acid, the +R effect does not operate to the same extent as in para isomer. As a result, the acidic weakening effect is smaller and metahydroxybenzoic acid is a stronger acid `(K_(a)=8.5xx10^(-5))` than benzoic acid. | |
| 36. |
Account for the following : (i) Benzoic acid does not undergo Friedel crafts reaction (ii) `Pk_(a)` value of chloroacetic is lower than `Pk_(a)` of acetic acid. |
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Answer» Correct Answer - A Due to presence of three Cl atoms with-I effect. |
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| 37. |
Which carboxylic acid `(B) (N.E = 52 gm eq^-1)` loses `CO_2` when heated to give an acid `( C) N.E = 60 gm eq^(-1)` ? |
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Answer» If `( C)` is monocarboxylic acid, `N.E. (Ew) = 60` `R - COOH = R + 45 = 60` `:. R = 15 = CH_3` `C = CH_3 COOH` `(B)` has one more `(-COOH)` group which on heating loses `(-CO_2)`. Therefore, it is malonic acid. `((B)rArrunderset(COOH)underset(|)(CH_(2))-COOH)` `N.E (Ew) = (Mw)/("Ionisable H atoms") = (104)/(2) = 52 gm eq.^-1`. |
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| 38. |
Assertion: Acetic acid does not undergo haloform reaction. Reason: Acetic acid has no alpha-hydrogen.A. Statement `I` is true , Statement `II` is true , Statement `II` is the correct explanation of Statement `I`.B. Statement `I` is true , Statement `II` is true , Statement `II` is not the correct explanation of Statement `I`.C. Statement `I` is true , Statement `II` is false.D. Statement `I` is false , Statement `II` is true. |
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Answer» Correct Answer - C Only aldehyde `(CH_3 - CHO)`, ketone `(CH_(3)-overset(O)overset(||)(C)-)` and alcohol `(CH_(3)-underset(OH)underset(|)(CH)-)`. Groups undergo haloform reaction. `alpha-H` atoms are present in acetic acid. Hence, Statement `(I)` is true but Statement `(II)` is false. |
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| 39. |
Acetic acid does not undergo haloform reaction. Acetic acid has no alpha-hydrogen.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 explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason are both incorrect. |
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Answer» Correct Answer - C (c) Correct reason. Acetic acid is not a methyl ketone. |
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| 40. |
Which of the following reactions involves the formation of a methyl ester from a carboxylic acid ?A. Hell-Volhard-Zelinsky reactionB. Hundiecker reactionC. Reaction with ammoniaD. Reaction with diazomethane. |
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Answer» Correct Answer - D (d) `RCH_(2)COOH+CH_(2)N_(2)rarrRCH_(2)COOCH_(3)+N_(2)` |
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| 41. |
Methylbenzoate can he prepared by :A. `C_(6)H_(5)COOH+CH_(3)OHoverset(H^(+))rarr`B. `C_(6)H_(5)COCl+CH_(3)OHoverset("Pyridine")rarr`C. `C_(6)H_(5)COOH+CH_(2)N_(2)rarr`D. All the above methods. |
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Answer» Correct Answer - D (d) All the above methods are correct. |
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| 42. |
Glutaric acid isA. butane-1, 4-dioic acidB. propane-1, 3-dioic acidC. pentane-1, 5-dioic acidD. hexane-1, 4-dioic acid |
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Answer» Correct Answer - C (c) Glutaric acid is pentane-1,5-dioic acid. |
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| 43. |
The correct order of strengths of the carboxylic acids A. `IgtIIgtIII`B. `IIgtIIIgtI`C. `IIIgtIIgtI`D. `IIgtIgtIII` |
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Answer» Correct Answer - B (b) It is correct order. The oxygen atom has-I effect and its presence (electron withdrawing nature) tends to increase the acidic strength. In compound (II), oxygen atom is coloser to the carboxyl group than in structure (III). Therefore, compound (II) is more acidic than (III) which is more acidic than (I) in which no oxygen atom is present. |
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| 44. |
Arrange the following in order of decreasing of acid strenth indicated ? (i) Benzoic acid, 3, 4-Dinitrobenzoic acid, 4-Methylbenzoic acid ltbgt (ii) `CH_(3)CH_(2)CH(Br)COOH,CH_(3)CH(Br)CH_(2)COOH,(CH_(3))_(2)CHCOOH` |
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Answer» Correct Answer - A (i) `3,4 Dinitrolbenzoic acid" gt "Benozic acid" gt "4-Methyl banzoic acid` (ii) `CH_(3)CH_(2)CH(Br)COOHgtCH_(3)CH(Br)CH_(2)COOHgt(CH_(3))_(2)CHCOOH.` |
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| 45. |
Electrolytic reduction of oxalic acid produces :A. Succinic acidB. Glycollic acidC. GlycolD. Glutaric acid |
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Answer» Correct Answer - B `underset ("Oxalic acid") (HOOC - COOH) underset ([H]) rarr underset("Glycolic acid") (HOOC - CH_2 OH)`. |
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| 46. |
The major product `( C)` in the reaction is : .A. B. C. D. All |
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Answer» Correct Answer - A Herem `2^@(-OH)` group would be sterically more hindered when ester with bulky `(PhCO)` group is formed. Hence , `1^@(-OH)` group reacts. |
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| 47. |
Which of the following react with benzoic acid to form enthy`1` benzoate?A. sodium ethoxideB. ethyl chlorideC. dry HCl, `C_2H_5OH`D. ethanol |
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Answer» Correct Answer - C Ethyl benzoate is prepared by reacting benzoic acid and ethanol in the presence of dry HCl.This reaction is known as esterification reaction. `underset"Benzoic acid"(C_6H_5COOH)+underset"Ethanol"(C_2H_5OH)underset"HCl"overset"Dry"hArrunderset"Ethyl benzoate"(C_6H_5COOC_2H_5)+H_2O` This reaction proceed with equilibrium. Therefore, `H_2O` continuously removed from reaction for preparation of ester product. |
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| 48. |
Assertion : `C_(6)H_(5)MgBr` reacts with `CO_(2)` and forms benzoic acid. Reason : `CO_(2)` acts an electrophile in the reaction.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 explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason are both incorrect. |
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Answer» Correct Answer - A (a) Reason is the correct explanation for assertion. |
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| 49. |
What is the relation between `K_(a)" and "pK_(a)` value of carboxylic acid ? |
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Answer» Correct Answer - A Higher the `K_(a)` value stronger is the acid. Higher the `pK_(a)` value, weaker is the acid. |
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| 50. |
Why is benzoic acid a stronger acid than acetic acid ? |
| Answer» Correct Answer - A | |