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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.
| 51. |
When 2-hydroxybenzoic acid is distilled with zinc dust, it gives :A. PhenolB. Benzoic acidC. BenzaldehydeD. A polymeric product. |
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Answer» Correct Answer - B (b) Zinc causes the reduction of 2-hydroxybenzoic acid to give benzoic acid |
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| 52. |
Give two chemical tests to distinguish between benzaldehyde and benzoic acid. |
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Answer» Benzoic acid gives a brisk effervescene with saturated `NaHCO_(3)` solution but benzaldehyde fails to respond to this test. `underset("Benzoic acid")underset()(C_(6)H_(5)COOH)+NaHCO_(3)rarrunderset("Sod. benzoate")underset()(C_(6)H_(5)COONa)+H_(2)O+underset("effervesence")underset("Brisk")underset()(CO_(2))` |
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| 53. |
Complete the reaction : `CH_(3)COOH+PCl_(5)rarr` |
| Answer» `underset("Acetic acid")underset()(CH_(3)COOH)+PCl_(5)rarrunderset("Acetyl chloride")underset()(CH_(3)COCl)+POCl_(3)+HCl` | |
| 54. |
The final product in the given reaction is A. B. C. D. |
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Answer» Correct Answer - D (d) is the correct answer. |
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| 55. |
Which of the following statements are correct about the following reaction : `RCOOH + LiAlH_4 rarr`.A. First step in the above reaction is : `RCOOH + LiAlH_4 rarr RCOO^(Ө) Li^(oplus) + H_2 + AlH_3`.B. Second step is the tranfer of `H^(Theta)` ion from `AIH_(3)` to `(C=O)` of `RCOO^(Theta)`.C. The intermediate product `(RCH =O)` is formedD. `(RCH=O)` is further reduced to `RCH_(2)O^(Theta)` which on acidification gives `RCH_(2)OH`. |
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Answer» Correct Answer - A::B::C::D `(a),(b),( c)` and `(d)` arethe steps of mechanism of reduction of `RCOOH` to `RCH_2 OH` by `LAH`. |
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| 56. |
Formic acid is obtained when :A. calcium acetate is heated with conc. `H_2SO_4`B. calcium formate is heated with calcium acetateC. glycerol is heated with oxalic acid at 373 KD. acetaldehyde is oxidised with `K_2Cr_2O_7` and `H_2SO_4` |
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Answer» Correct Answer - C `underset"Oxalic acid"underset(COOH)overset(COOH)(|)underset"Heat 373 K"overset"Glycerol"to=underset"Formic acid"(HCOOH)+CO_2uarr` |
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| 57. |
(a) Define the term neutralisation equivalent of an acid. (b) Find the number of ionisable `H` atoms for a polycarboxyclic acid `(Mw = 210 gm mol^-1)` with a neutralisation equivalent if `70 gm eq^-1`. How many equivalents of `NaOH` would be neutralised by `1 mol` of this acid ? ( c) Find the neutralisation equivalent of mellitic acid, `C_6(COOH)_6`. |
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Answer» (a) `N.E` is the `Ew(gm eq.^-1)` of an acid as determined by titration with standard `NaOH`. (b) The number of ionisable `H` atoms `= 210//70 = 3 eq. mol^-1`. The number of equivalent of `NaOH` = The number of ionisable `H` atom `= 3 eq. mol^-1`. ( c) `N.E` of mellitic acid `= (Mw)/("No. of ionisable H atoms")` =`(342 gm mol^-1)/(6 eq. mol^-1)` =`57 gm eq.^-1`. |
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| 58. |
Name of following reaction. `CH_2(COOH)_2 overset (P_2 O_5)rarr C_3 O_2 + 2H_2 O`.A. Diels-Alder reactionB. Wolff-Kishner reactionC. Diels-Wolff reactionD. None of these |
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Answer» Correct Answer - D The statement is self-explanatory. |
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| 59. |
Which of the following order is incorrect w.r.t. the property indicated ?A. Formic acid `gt Acetic acid gt Propionic acid (ACID STRENGTH)`B. `Cyclohexanol gt Phenol lt Benzoic acid (ACID STRENGTH)`C. `Benzamide lt Cyclohexlamine lt Aniline (BASIC STRENGTH)`D. `FCH_2 COOH gt ClCH_2 COOH gt BrCH_2 COOH` (ACID STRENGTH). |
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Answer» Correct Answer - C Basic strength is : Benzamide lt Aniline lt Cyclo-hexylamine. |
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| 60. |
Which of the following cannot be acetylated with `CH_3 COCl//Py` ?A. `MeCOOH`B. `CH_3 NH_2`C. D. |
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Answer» Correct Answer - A Acetylation of `(OH)` and `(NH_2)` groups, occurs. |
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| 61. |
The decreasing order of ester formation with benzoic acid in presence of `H^(oplus)` is : (I) A. `(I) gt (II) gt (III) gt (IV)`B. `(I) gt (II) gt (IV) gt (III)`C. `(IV) gt (III) gt (II) gt (I)`D. `(III) gt (IV) gt (II) gt (I)` |
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Answer» Correct Answer - B Lesser the steruc hindrance, more easily the ester formed. |
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| 62. |
and find the product `(s)` of the controlled hydrolysis of `AZT`.A. B. C. D. All |
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Answer» Correct Answer - B Lactam (cyclic amide) linkage is cleaved to give product in `(b)`. |
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| 63. |
Which of the following substances is likely of be effective as detergents in water ?A. `CH_3 (CH_2)_15 CH_2 OSO_3^(Ө) overset (oplus) (Na)`B. `CH_3(CH_2)_16 COOH`C. `CH_3 (CH_2)_16 CO overset(Ө) O Na^(oplus)`D. `[CH_3 (CH_2)_16 COO^-]_2 Ca`. |
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Answer» Correct Answer - A Sodium salts of sulphonated long-chain alcohols or hydrocarbons are used as anionic detergents. |
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| 64. |
The storngest acid among the following is :A. `C"C"l_(3)COOH`B. `FCH_(2)COOH`C. D. |
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Answer» Correct Answer - D (d) The presence of three electron withdrawing `NO_(2)` groups makes the picric acid the strongest acid. |
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| 65. |
Why has monochloroethanoic acid higher `pK_(a)` value than dichloroethanoic acid ? |
| Answer» Monochloroethanoic acid `(ClCH_(2)COOH)` has only one chlorine atom with-I effect while dichlorethanoic acid `(Cl_(2)CHCOOH)` has two chlorine atoms. As a result, release of proton from monochloroethanoic acid is difficult as compared to dichloroethanoic acid. Therefore, monochloroethanoic acid has `pK_(a)` value (2.87) than dichloroethanoic acid (1.26) and it is a weaker acid. | |
| 66. |
Write IUPAC name of `CH_(3)-underset(Cl)underset(|)(CH)-underset(COOH)underset("| ")(CH)-CH_(3)` |
| Answer» 3-Chloro-2-methylbutanoic acid. | |
| 67. |
Give the IUPAC name of the compound `(CH_(3))_(3)C-underset(O)underset(||)C-COOH` |
| Answer» 3, 3-Dimethyl-2-oxobutanoic acid. | |
| 68. |
Arrange the following in increasing order of acid strength : (i) `CH_(3)CH_(2)CH(Br)COOH` , (ii) `CH_(3)CH(Br)CH_(2)COOH` , (iii) `CH_(3)COOH` |
| Answer» The increasing order of acidic strength : `(ii) lt(ii)lt(i)` | |
| 69. |
Why is `CH_(2)=CH-COOH` a stronger acid than `CH_(3)CH_(2)COOH`? |
| Answer» Correct Answer - A | |
| 70. |
Which of the following would give `(-)-2-butanol` ?A. B. C. D. All |
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Answer» Correct Answer - D Inversion occurs in `(a)` and `(b)`, since chiral `(C-Br)` bond is broken. In `( c)`, hydrolysis of ester takes place without breaking the chiral `C` atom. |
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| 71. |
Which reagent can distinguish between pentanoic acid and pentanamide ?A. Cold `dil. NaOH`B. Cold `dil. NaHCO_3`C. Cold `conc. H_2 SO_4`D. All |
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Answer» Correct Answer - D (a) Amides are hydrolysed by dilute `NaOH` to give `NH_3`. (b) `NaHCO_3` reacts with acids to give `CO_2 (g)`. ( c) Amides are also hydrolysed in acidic conditions. |
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| 72. |
The reactant `(A)` is the reaction is : .A. `MeCOOEt` and `(EtO-underset(O)underset(||)(C)-underset(O)underset(||)(C)-Et)`B. `EtCOOEt + EtOOC - COOEt`C. `(EtOOC-underset(Me)underset(|)(CH)-COOEt+HCOOEt)`D. `EtCOOEt + HCOOEt`. |
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Answer» Correct Answer - B Proceed reverse as explained. |
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| 73. |
The compound `(D)` is :A. `RCOOH`B. `RCH_2 OH`C. `R-C -= N`D. `RCHO` |
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Answer» Correct Answer - D `RCONH_2 (B), R - C -= N( C), RCHO (D)`. |
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| 74. |
Compound `(D)` is :A. `PhCOCl`B. `PhCONH_2`C. `PhCOOH`D. `(PhCO)_2 O` |
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Answer» Correct Answer - D `PhCOOH (B), PhCOCl ( C), (PhCO)_2 O(D)`. |
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| 75. |
Product `(B)` in the reaction is : .A. B. C. D. |
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Answer» Correct Answer - C Claisen ester condensation. |
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| 76. |
In the following reactions, identify the compounds (A), (B), (C) and R-MgBr. |
| Answer» (A) `HCOOCH(CH_(3))_(2)`, (B) `(CH_(3))_(2)CHOH`, (C) HCOOH, R-MgBr is `CH_(3)MgBr` | |
| 77. |
Which of the following will evolve `N_(2)` gas with `Br_(2)//KOH` ?A. `NH_(2)CONH_(2)`B. `CH_(3)CONH_(2)`C. `HCONH_(2)`D. `C_(6)H_(5)CONHCH_(3)` |
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Answer» Correct Answer - A (a) `NH_(2)CONH_(2)+3Br_(2)+8KOHrarrN_(2)+K_(2)CO_(3)+6KBr+6H_(2)O`. |
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| 78. |
The correct order of acidity of the following is A. `(III)gt(IV)gt(II)gt(I)`B. `(IV)gt(III)gt(I)gt(II)`C. `(III)gt(II)gt(I)gt(IV)`D. `(II)gt(III)gt(IV)gt(I)` |
| Answer» Correct Answer - A | |
| 79. |
Which of the following does not contain `(-COOH)` group ?A. AspirinB. Benzoic acidC. Picric acidD. All have `(-COOH)` group |
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Answer» Correct Answer - C Picric acid is `2,4,6-`trinitrophenol. It does not contain `(COOH)` group. |
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| 80. |
The correct order of acidity for the following compounds is A. `IgtIIgtIIIgtIV`B. `IIIgtIgtIIgtIV`C. `IIIgtIVgtIIgtI`D. `IgtIIIgtIVgtII` |
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Answer» Correct Answer - B::C (a) It is the correct order. It is explained on the basis of ortho effect and hydrogen bonding. Ortho effect is noticed in both (I) and (II). But acid (I) is stronger because intermolecular hydrogen bonding in the conjugate base of (I) is more than that of (II) since there are two OH groups present. Acid (II) is stranger acid than acid (I). |
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| 81. |
The acids which do not contain a-COOH group are :A. Propionic acidB. Picric acidC. Carbolic acidD. Lactic acid. |
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Answer» Correct Answer - B::C (b,c) Both picric acid and carbolic acid (Phenol) do not contain any-COOH group. |
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| 82. |
Write the IUPAC name of |
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Answer» Correct Answer - A (i) 2-Phenylethanoic acid , (ii) 2-Bromobutanoic acid (iii) Formylmethanoic acid , (iv) 3-Ketobutanoic acid (v) 3-Phenylprop-2-enoic acid , (vi) 2-Phenylethanoic acid (vii) 2-chloroethanoic acid , (viii) 2-Formylbutanoic acid (ix) 3-Hydroxybutanoic acid , (x) 2-Methylpropanoic acid. |
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| 83. |
Write IUPAC name of the compound |
| Answer» 2-Methylcyclopent-3-enecarboxylic acid. | |
| 84. |
How will you convert benzoic acid to benzamide ? |
| Answer» `underset("Benzoic acid")underset()(C_(6)H_(5)COOH)+NH_(3)rarrunderset("Amm. benzoate")underset()(C_(6)H_(5)COONH_(4))overset("heat")rarrunderset("Benzamide")underset()(C_(6)H_(5)CONH_(2))` | |
| 85. |
Why are boiling of aldehydes and ketones lower than those of the corresponding acids ? |
| Answer» In the carboxylic acids, the carboxyl group are involved in the intermolecular hydrogen bonding. However, it is absent in the aldehydes and ketones. Therefore, aldehydes and ketones have lower boiling points than the corresponding acids of comparable molecular mass. | |
| 86. |
Among the following compounds, the one (s) that gives (gives) effervescence with aqueous `NaHCO_(3)` solution is (are) : (I) `(CH_(3)CO)_(2)O` , (II) `CH_(3)COOH` (III) `PhOH` , (IV) `CH_(3)COCHO`A. I and IIB. I and IIIC. Only IID. I and IV |
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Answer» Correct Answer - A (a) `Both(CH_(3)CO)_(2)O` (upon hydrolysis) and `CH_(3)COOH` give brisk effervescence with `NaHCO_(3)` solution. |
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| 87. |
Which of the following esters is formed by reacting propan-2-01 with ethanoic acid ?A. `(CH_(3))_(2)CHCOOCH_(3)`B. `CH_(3)COOCH_(2)CH_(3)`C. `CH_(3)COOCH(CH_(3))_(2)`D. `(CH_(3))_(2)CHCOOCH_(2)CH_(3)` |
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Answer» Correct Answer - A (a) `CH_(3)underset(CH_(3))underset(|)CHOH+HOOC"C"H_(3)overset(-H_(2)O)rarrCH_(3)underset(CH_(3))underset(|)CHOOC"C"H_(3)` |
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| 88. |
How will you convert benzene to benzoic acid ? |
| Answer» Correct Answer - A | |
| 89. |
Addition of water to alkyness occurs in acidic medium and in the presence of `Hg^(2+)` ions as a catalyst. Which of the following products will be formed on additon of water to but-1-yne under these conditions?A. `CH_(3)-CH_(2)-CH_(2)-overset(O)overset(||)C-H`B. `CH_(3)-CH_(2)-overset(O)overset(||)C-CH_(3)`C. `CH_(3)-CH_(2)-overset(O)overset(||)C-OH+CO_(2)`D. `CH_(3)-overset(O)overset(||)C-OH+H-overset(O)overset(||)C-H` |
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Answer» Correct Answer - B `underset("But-1-yne")underset()(CH_(3)-CH_(2)-C)equivCH+H_(2)Ooverset(H_(2)O)underset((Hg^(2+)//H^(+)))rarrunderset("Butanone")underset()(CH_(3)-CH_(2)-overset(O)overset(||)C-CH_(3))` |
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| 90. |
When `CH_(2) = CHCOOH` is reduced with `LiAIH_(4)`., the compound obtained isA. `CH_(3)CH_(2)COOH`B. `CH_(2)=CHCH_(2)OH`C. `CH_(3)CH_(2)CH_(2)OH`D. `CH_(3)CH_(2)CHO` |
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Answer» Correct Answer - A (a) `LiAIH_(4)` reduces both C=C bond and COOH group. |
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| 91. |
Among the following the lowest `pK_(a)` value is of :A. `CH_(3)COOH`B. `HCOOH`C. `(CH_(3))_(2)CHCOOH`D. `CH_(3)CH_(2)COOH` |
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Answer» Correct Answer - B (b) HCOOH is the strongest acid. It has the lowest `pK_(a)` value. |
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| 92. |
Which of the following compound will have the smallest `pK_(a)` value ?A. Benzoic acidB. Formic acidC. Acetic acidD. Phenyl acetic acid |
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Answer» Correct Answer - B (b) Formic acid will have the smallest `pK_(a)` value and is the storngest acid. |
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| 93. |
Assertion : Carboxylic acids of lower molecular mass are water soluble. Reason : Carboxylic acids of lower molecular mass are hydrogen bonded with molecules of water.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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| 94. |
Which represents the correct order of relative acidic strengths ?A. `HCOOHgtCH_(3)COOHgtClCH_(2)COOHgtC_(2)H_(5)COOH`B. `ClCH_(2)COOHgtHCOOHgtCH_(3)COOHgtC_(2)H_(5)COOH`C. `CH_(3)COOHgtHCOOHgtClCH_(2)COOHgtC_(2)H_(5)COOH`D. `C_(2)H_(5)COOHgtCH_(3)COOHgtHCOOHgtClCH_(2)COOH.` |
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Answer» Correct Answer - B (b) It represents the correct order. |
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| 95. |
Match the reactions given in Column I with the suitable reagents given in Column II. |
| Answer» Correct Answer - A::B::C::D | |
| 96. |
Match the common names given in Column I with the IUPAC names given in Column II. |
| Answer» Correct Answer - A::B::C::D | |
| 97. |
Match the acids given in Column I with their correct IUPAC names given in Column II. |
| Answer» Correct Answer - A::B::C::D | |
| 98. |
Write IUPAC names of : |
| Answer» (i) Butane-1, 4-dioic acid. (ii) 4-Methylhexanoic acid. | |
| 99. |
Define the term fatty acids. Give the common and IUPAC names for the following fatty acids: (i) `CH_(3) (CH_(2))_(14) COOH` (ii) `CH_(3) (CH_(2))_(16) COOH` (ii) `CH_(3) (CH_(2))_(7) CH=CH(CH_(2))_(7) COOH` |
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Answer» Fatty acids are long chain aliphatic acids obtained by hydrolysis from naturally occuring oils and fats. (i) Palmitric or hexadecanoic acid (ii) Steric or octadenoic acid acid (iii) Oleic or cis-9-octadecanoic acid. |
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| 100. |
Write IUPAC names of the following : |
| Answer» (i) Ethane-1, 2-dial , (ii) Benzene-1, 4-dicarbaldehyde , (iii) 3-Bromobenzaldehyde. | |