Aldehydes, Ketones & Acids · JEE Main previous year questions

Match List - I with List - II. $$\begin{array}{llll}& \text{List - I}& & \text{List - II}\\ & \text{Mixture of Compounds}& & \text{Reagent used to distinguish}\\ \text{A.}& \text{Diethyl amine}+\text{Ethyl amine}& \text{I.}& \text{Bromine water}\\ \text{B.}& \text{Acetaldehyde}+\text{Acetone}& \text{II.}& \mathrm{CHC}{\mathrm{l}}_3+\mathrm{KOH},\mathrm{\Delta }\\ \text{C.}& \text{Ethanol}+\text{Phenol}& \text{III.}& \text{Neutral }\mathrm{FeC}{\mathrm{l}}_3\\ \text{D.}& \text{Benzoic acid}+\text{Cinnamic acid}& \text{IV.}& \text{Ammonical silver nitrate}\end{array}$$ Choose the correct answer from the options given below :

1. A.A-IV, B-II, C-I, D-III
2. B.A-IV, B-II, C-III, D-I
3. C.A-II, B-IV, C-I, D-III
4. D.A-II, B-IV, C-III, D-I

1. A.B
2. B.D
3. C.A
4. D.C

1. A.A and D
2. B.A and B
3. C.B and D
4. D.B and C

1. A.A, B & C Only
2. B.A, C & E Only
3. C.B, D & E Only
4. D.A & C Only

Match the LIST-I with LIST-II $$\begin{array}{llll}& \text{List-I Reagents}& & \text{List-II Name of Reaction involving carbonyl compounds}\\ \text{A.}& N{H}_2-N{H}_2,KOH& \text{I.}& \text{Tollen’s Test}\\ \text{B.}& Ag(N{H}_3{)}_{2}OH& \text{II.}& \text{Clemmensen Reduction}\\ \text{C.}& \text{Aq. }CuS{O}_4\text{, Sodium Potassium tartrate, KOH}& \text{III.}& \text{Wolff - Kishner Reduction}\\ \text{D.}& Zn-Hg,HCl& \text{IV.}& \text{Fehling’s Test}\end{array}$$ Choose the correct answer from the options given below :

1. A.A-IV, B-III, C-II, D-I
2. B.A-III, B-I, C-IV, D-II
3. C.A-II, B-I, C-IV, D-III
4. D.A-III, B-IV, C-I, D-II

Match List - I with List - II. $$\begin{array}{ll}\text{List – I (Reagents)}& \text{List – II (Reaction Name (Involving aldehydes))}\\ \text{A. }{\mathrm{H}}_2,Pd–BaS{\mathrm{O}}_4& \text{I. Etard Reaction}\\ \text{B. }\mathrm{SnC}{\mathrm{l}}_2,\mathrm{HCl}& \text{II. Rosenmund Reduction}\\ \text{C. }\mathrm{Cr}{\mathrm{O}}_2\mathrm{C}{\mathrm{l}}_2,\mathrm{C}{\mathrm{S}}_2& \text{III. Gattermann–Koch Reaction}\\ \text{D. }\mathrm{CO},\mathrm{HCl},Anhyd.\mathrm{AlC}{\mathrm{l}}_3& \text{IV. Stephen Reaction}\end{array}$$ Choose the correct answer from the options given below :

1. A.A-II, B-III, C-IV, D-I
2. B.A-IV, B-III, C-I, D-II
3. C.A-IV, B-I, C-II, D-III
4. D.A-II, B-IV, C-I, D-III

1. A.
2. B.
3. C.
4. D.

1. A.
2. B.
3. C.
4. D.

1. A.Statement I is correct but Statement II is incorrect
2. B.Both Statement I and Statement II are correct
3. C.Both Statement I and Statement II are incorrect
4. D.Statement I is incorrect but Statement II is correct

In the Claisen-Schmidt reaction to prepare dibenzalacetone from 5.3 g of benzaldehyde, a total of 3.51 g of product was obtained. The percentage yield in this reaction was _______ %.

Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizzaro Reaction C. Aldol Condensation D. Tollen's Test E. Clemmensen Reduction Choose the correct answer from the options given below:

1. A.C and E Only
2. B.A, B and D Only
3. C.A, C and E Only
4. D.B, C and D Only

$\mathrm{Xg}$ of benzoic acid on reaction with aq $\mathrm{NaHC}{\mathrm{O}}_3$ released $\mathrm{C}{\mathrm{O}}_2$ that occupied $11.2\mathrm{L}$ volume at STP. $\mathrm{X}$ is ____ $\mathrm{g}$.

1. A.(A)-(III), (B)-(IV), (C)-(I), (D)-(II)
2. B.(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
3. C.(A)-(I), (B)-(III), (C)-(II), (D)-(IV)
4. D.(A)-(III), (B)-(IV), (C)-(II), (D)-(I)

1. A.$\mathrm{PbC}{\mathrm{l}}_2$, $\mathrm{PbS}{\mathrm{O}}_4$, $\mathrm{PbCr}{\mathrm{O}}_4$
2. B.$\mathrm{PbS}$, $\mathrm{PbS}{\mathrm{O}}_4$, $\mathrm{Pb}(\mathrm{C}{\mathrm{H}}_3\mathrm{COO}{)}_2$
3. C.$\mathrm{PbS}$, $\mathrm{PbS}{\mathrm{O}}_4$, $\mathrm{PbCr}{\mathrm{O}}_4$
4. D.$\mathrm{PbC}{\mathrm{l}}_2$, $\mathrm{Pb}(\mathrm{S}{\mathrm{O}}_4{)}_2$, $\mathrm{PbCr}{\mathrm{O}}_4$

1. A.Statement I is true but Statement II is false
2. B.Both Statement I and Statement II are true
3. C.Statement I is false but Statement II is true
4. D.Both Statement I and Statement II are false

1. A.(A), (C) and (D) Only
2. B.(A), (B) and (C) Only
3. C.(A), (D) and (E) Only
4. D.(C), (D) and (E) Only

Which of the following compounds will give silver mirror with ammoniacal silver nitrate? A. Formic acid B. Formaldehyde C. Benzaldehyde D. Acetone Choose the correct answer from the options given below :

1. A.B and C only
2. B.C and D only
3. C.A, B and C only
4. D.A only

Considering acetic acid dissociates in water, its dissociation constant is $6.25\times 10^{-5}$. If $5\mathrm{mL}$ of acetic acid is dissolved in 1 litre water, the solution will freeze at $-x\times 10^{-2\circ }\mathrm{C}$, provided pure water freezes at $0^{\circ }\mathrm{C}$. $x=$ ____. (Nearest integer) Given : $({\mathrm{K}}_{\mathrm{f}}{)}_{\text{water}}=1.86\mathrm{K}\mathrm{kg}\mathrm{mo}{\mathrm{l}}^{-1}$ density of acetic acid is $1.2\mathrm{g}\mathrm{m}{\mathrm{L}}^{-1}$. molar mass of water $=18\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$. molar mass of acetic acid$=60\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$. density of water $=1\mathrm{g}\mathrm{c}{\mathrm{m}}^{-3}$ Acetic acid dissociates as $\mathrm{C}{\mathrm{H}}_3\mathrm{COOH}\rightleftharpoons \mathrm{C}{\mathrm{H}}_3\mathrm{CO}{\mathrm{O}}^{\ominus }+{\mathrm{H}}^{\oplus }$

In the Claisen-Schmidt reaction to prepare $351\mathrm{g}$ of dibenzalacetone using $87\mathrm{g}$ of acetone, the amount of benzaldehyde required is ____ $\mathrm{g}$. (Nearest integer)

Given below are two statements : Statements I : Acidity of $\alpha$-hydrogens of aldehydes and ketones is responsible for Aldol reaction. Statement II : Reaction between benzaldehyde and ethanal will NOT give Cross - Aldol product. In the light of the above statements, choose the most appropriate answer from the options given below :

1. A.Both Statement I and Statement II are incorrect
2. B.Statement I is correct but Statement II is incorrect
3. C.Both Statement I and Statement II are correct
4. D.Statement I is incorrect but Statement II is correct

From the compounds given below, number of compounds which give positive Fehling's test is _________. Benzaldehyde, Acetaldehyde, Acetone, Acetophenone, Methanal, 4-nitrobenzaldehyde, cyclohexane carbaldehyde.

$$\text{D -(+)- Glyceraldehyde}\underset{\text{iii) }{\mathrm{HNO}}_3}{\overset{\text{i) HCN, ii) }{\mathrm{H}}_{2}O/{\mathrm{H}}^{+}}{\to }}$$ The products formed in the above reaction are

1. A.Two optically active products
2. B.One optically active and one meso product
3. C.Two optically inactive products
4. D.One optically inactive and one meso product.

The mass of ${\mathrm{NH}}_3$ produced when $131.8\text{ kg}$ of cyclohexanecarbaldehyde undergoes Tollen's test is _________ kg. (Nearest Integer) Molar Mass of $\mathrm{C}=12\text{ g/mol}$ $\mathrm{N}=14\text{ g/mol}$ $\mathrm{O}=16\text{ g/mol}$

1. A.Both A and R are true and R is the correct explanation of A
2. B.A is false but R is true
3. C.A is true but R is false
4. D.Both A and R are true but R is NOT the correct explanation of A

The descending order of acidity for the following carboxylic acid is- A. $\mathrm{C}{\mathrm{H}}_3\mathrm{COOH}$ B. ${\mathrm{F}}_3\mathrm{C}-\mathrm{COOH}$ C. $\mathrm{ClC}{\mathrm{H}}_2-\mathrm{COOH}$ D. $\mathrm{FC}{\mathrm{H}}_2-\mathrm{COOH}$ E. $\mathrm{BrC}{\mathrm{H}}_2-\mathrm{COOH}$ Choose the correct answer from the options given below:

1. A.$\mathrm{B}>\mathrm{C}>\mathrm{D}>\mathrm{E}>\mathrm{A}$
2. B.$\mathrm{D}>\mathrm{B}>\mathrm{A}>\mathrm{E}>\mathrm{C}$
3. C.$\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{E}>\mathrm{A}$
4. D.$\mathrm{E}>\mathrm{D}>\mathrm{B}>\mathrm{A}>\mathrm{C}$