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Test: MCQs (One or More Correct Option): Aldehydes, Ketones & Carboxylic Acids | JEE Advanced

19 Questions MCQ Test Class 12 Chemistry 35 Years JEE Mains &Advance Past yr Paper | Test: MCQs (One or More Correct Option): Aldehydes, Ketones & Carboxylic Acids | JEE Advanced

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Attempt Test: MCQs (One or More Correct Option): Aldehydes, Ketones & Carboxylic Acids | JEE Advanced | 19 questions in 40 minutes | Mock test for JEE preparation | Free important questions MCQ to study Class 12 Chemistry 35 Years JEE Mains &Advance Past yr Paper for JEE Exam | Download free PDF with solutions

*Multiple options can be correct

QUESTION: 1

Base catalysed aldol condensation occurs with :

A.
propionaldehyde
B.
ben zaldehyde
C.
2-methylpropionaldehyde
D.
2, 2-dimethylpropionaldehyde

Solution:

TIPS/Formulae :

Aldehydes having at least one α-hydrogen atom undergo aldol condensation.

*Multiple options can be correct

QUESTION: 2

Which of the following compounds will give a yellow precipitate with iodine and alkali?

A.
2-Hydroxypropane
B.
acetophenone
C.
methyl acetate
D.
acetamide

Solution:

TIPS/Formulae :
Iodoform reaction is given by the compounds containing
CH₃CHO and CH₃CH₂OH.2-Hydroxypropane (CH₃CHOHCH₃) contains the grouping CH₃CHOH— and acetophenone (C₆H₅COCH₃) contains the grouping CH₃CO– linked to carbon and hence give yellow ppt. with I₂ and alkali—iodoform test.
In methyl acetate (CH₃COOC₂H₅) and acetamide (CH₃CO–NH₂), CH₃CO is attached to a hetero atom but not to carbon atom and hence both these compounds do not give iodoform test.

*Multiple options can be correct

QUESTION: 3

Which of the following compounds will react with ethanolic KCN?

A.
ethyl chloride
B.
acetyl chloride
C.
chlorobenzene
D.
benzaldehyde

Solution:

NOTE :

Ethyl chloride and acetyl chloride react with alc. KCN by nucleophilic substitution reaction while benzaldehyde undergoes benzoin condensation :

*Multiple options can be correct

QUESTION: 4

Keto-enol tautomerism is observed in

Solution:

Keto-enol tautomer ism is sh own in compounds having a-hydrogen on the C adjacent to the CO group.

*Multiple options can be correct

QUESTION: 5

Which of the following are examples of aldol condensation?

Solution:

NOTE : Aldehydes and ketones containing a-Hydrogen atom undergo aldol condensation.

*Multiple options can be correct

QUESTION: 6

A new carbon-carbon bond formation is possible in

A.
Cannizzaro reaction
B.
Friedel–Craft alkylation
C.
Clemmensen reduction
D.
Reimer–Tiemann reaction

Solution:

*Multiple options can be correct

QUESTION: 7

Which of the following will react with water?

A.
CHCI₃
B.
Cl₃CCHO
C.
CCI₄
D.
CICH₂CH₂Cl

Solution:

TIPS/Formulae :
Three Cl of chloral makes its carbonyl carbon highly electron deficient, hence H₂O, a nucleophile easily adds on it forming chloral hydrate, CCl₃CH(OH)₂, which is quite stable due to intramolecular H–bonding between two –OH groups.

*Multiple options can be correct

QUESTION: 8

Which of the following will undergo aldol condensation?

A.
acetaldehyde
B.
propanaldehyde
C.
benzaldehyde
D.
trideuteroacetaldehyde

Solution:

TIPS/Formulae :
Carbonyl compounds having α – H or α - D undergo aldol condensation.

*Multiple options can be correct

QUESTION: 9

Which of the following reactants on reaction with conc. NaOH followed by acidification gives following lactone as the product?

Solution:

*Multiple options can be correct

QUESTION: 10

The major products P and Q are

Solution:

*Multiple options can be correct

QUESTION: 11

The smallest ketone and its next homologue are reacted with NH₂OH to form oxime

A.
Two different oximes are formed
B.
Three different oximes are formed
C.
Two oximes formed are optically active
D.
All oximes formed are optically active

Solution:

*Multiple options can be correct

QUESTION: 12

Identify the binary mixture(s) that can be separated into individual compounds, by differential extraction as shown in the given scheme.

A.
C₆H₅OH and C₆H₅COOH
B.
C₆H₅COOH and C₆H₅CH₂OH
C.
C₆H₅CH₂OH and C₆H₅OH
D.
C₆H₅CH₂OH and C₆H₅CH₂COOH

Solution:

(A) Both are soluble in NaOH, hence inseparable.
(B) Only benzoic acid (C₆H₅COOH) is soluble in NaOH and NaHCO₃, while benzyl alcohol (C₆H₅CH₂OH) is not.
Hence, separable.
(C) Although NaOH can enable separation between benzyl alcohol (C₆H₅CH₂OH) and phenol (C₆H₅OH) as only the later is soluble in NaOH. However, in NaHCO₃, both are insoluble. Hence, inseparable.
(D) a-Phenylacetic acid (C₆H₅CH₂COOH) is soluble in NaOH and NaHCO₃. While benzyl alcohol (C₆H₅CH₂OH) is not. Hence, separable.

*Multiple options can be correct

QUESTION: 13

With reference to the scheme given below, which of the given statement(s) about T, U, V and W is (are) correct ?

A.
T is soluble in hot aqueous NaOH
B.
U is optically active
C.
Molecular formula of W is C₁₀H₁₈O₄
D.
V gives effer vescen ce on treatment with aqueous NaHCO₃.

Solution:

*Multiple options can be correct

QUESTION: 14

In the following reaction, the product(s) formed is(are)

A.
P (major)
B.
Q (minor)
C.
R (minor)
D.
S (major)

Solution:

*Multiple options can be correct

QUESTION: 15

After completion of the reactions (I and II), the organic compound(s) in the reaction mixtures is(are)

A.
Reaction I : P and Reaction II : P
B.
Reaction I : U, acetone and Reaction II : Q, acetone
C.
Reaction I : T, U, acetone and Reaction II : P
D.
Reaction I : R, acetone and Reaction II : S, acetone

Solution:

*Multiple options can be correct

QUESTION: 16

The major product of the following reaction is

Solution:

*Multiple options can be correct

QUESTION: 17

Positive Tollen’s test is observed for

Solution:

Aldehydes and a-Hydroxyketones show positive Tollen's test.

*Multiple options can be correct

QUESTION: 18

The correct statement(s) about the following reaction sequence is(are)

A.
R is steam Volatile
B.
Q gives dark violet coloration with 1% aqueous FeCl₃ solution
C.
S gives yellow precipitat e w ith 2, 4 –dinitro phenylhydrazine
D.
S gives dark violet coloration with 1% aqueous FeCl₃ solution

Solution:

Q is steam volatile not R.
Q and R show positive test with 1% aqueous FeCl₃ solution.
Q, R, S give yellow precipitate with 2, 4-dinitrophenyl hydrazine.

*Multiple options can be correct

QUESTION: 19

Reagent(s) which can be used to bring about the following transformation is (are)

A.
LiAlH₄ in (C₂H₅)₂O
B.
BH₃ in THF
C.
NaBH₄ in C₂H₅OH
D.
Raney Ni/H₂ in THF

Solution:

LiAlH₄/(C₂H₅)₂O : Reduces to ester s, carboxylic acid, epoxides and aldehydes and ketones.
BH₃ in T.H.F : Reduces to –COOH and aldeh ydes into alcohols but do not reduce to esters and epoxides.
NaBH₄ in C₂H₅OH : Reduces only aldehydes and ketones into alcohols but not to others.
Raney Ni in T.H.F. : Do not reduce to –COOH, –COOR and epoxide but it can reduce aldehyde into alcohols.