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Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids


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25 Questions MCQ Test Chemistry for JEE | Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids for JEE 2023 is part of Chemistry for JEE preparation. The Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids questions and answers have been prepared according to the JEE exam syllabus.The Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids MCQs are made for JEE 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids below.
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Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 1

What is B?

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 1


Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 2

On vigorous oxidation by permanganate solution.

(CH3)2C = CH - CH2 - CHO gives

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 2

On vigrous oxidation with potassium permanganete, the aldehyde group is oxidized to acid.
The carbon carbon double bond is broken and both the carbons attached to double bond are oxidized to carboxylic groups.
(CH3​)2​C=CH−CH2−CHO ---------->(Acidified potassium permanganate) ​(CH3​)2​COOH + CH2​(COOH)2

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 3

Picric acid is:

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 3

2,4,6-trinitrophenol is also known as picric acid.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 4

When CH2 = CH — COOH is reduced with LiAlH4, the compound obtained will be

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 4

LiAlH4 can reduce COOH group and not the double bond.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 5

On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 5

There is no reaction hence the resultant mixture contains CH3 COOC2H5 + NaCl.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 6

Acetyl bromide reacts with excess of CH3MgI followed by treatment with a saturated solution of NH4Cl gives

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 6

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 7

Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 7

It is Clemmensen’s reduction

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 8

Which one of the following undergoes reaction with 50% sodium hyroxide solution to give the corresponding alcohol and acid?

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 8

This reaction  is known as cannizzaro’s reaction. In this reaction benzaldehyde in presence of  50%. NaOH undergoes disproportionation  reaction and form one mol of Benzyl  alcohol (Red. product) and one mole of sod. benzoate (ox. product)

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 9

Among the following acids which has the lowest pKa value?

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 9

pKa = –log Ka; HCOOH is the strongest acid and hence it has the highest Ka or lowest pKa value.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 10

Reaction of cycloh exan on e with dimethylamine in th e presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 10

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 11

The increasing order of the rate of HCN addition to compound A – D is

(A) HCHO
(B) CH3COCH3
(C) PhCOCH3
(D) PhCOPh

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 11

NOTE : Addition of HCN to carbonyl compounds is nucleophilic addition reaction. The order of reactivity of carbonyl compounds is Aldehydes (smaller to higher) Ketones (smaller to higher), Then                    

HCHO > CH3COCH3 > Ph.COCH3 > PhCOPh

NOTE : The lower reactivity of Ketones is due to presence of two alkyl group which shows +I effect.
The reactivity of Ketones decreases as the size of alkyl group increases.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 12

Th e correct order of increasing acid stren ght of the compounds

(A) CH3CO2H
(B) MeOCH2CO2H
(C) CF3CO2H

is

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 12

The correct order of increasing acid strength

CF3 . COOH > MeOCH2COOH > CH3COOH > (Me)2CH.COOH

[NOTE : Electron withdrawing groups increase the acid strength and electron donating groups decrease the acid strength.]

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 13

A liquid was mixed with ethanol and a drop of concentrated H2SO4 was added. A compound with a fruity smell was formed. The liquid was :

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 13

Fruity smell is due to ester formation which is formed between ethanol and acid.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 14

Which of the following on heating with aqueous KOH, produces acetaldehyde?

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 14

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 15

In Cannizzaro reaction given below

the slowest step is :

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 15


Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 16

Which of the following reagents may be used to distinguish between phenol and benzoic acid?

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 16

Phenol gives a violet colour with neutral ferric chloride solution whereas benzoic acid does not give this test.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 17

Trichloroacetaldehyde was subjected to Cannizzar o’s reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. 

The other compound is :

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 17

In Cannizzaro’s reaction the compounds which do not contain a-hydrogen atoms undergo oxidation and reduction simultaneously i.e undergo disproportion ation and form one molecule of sodium salt of carboxylic acid as oxidation product and one molecule of alcohol as reduction product.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 18

The strongest acid amongst the following compounds is :

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 18

The electron withdrawing (–I) group – Cl withdraws electrons from O – H bond and thus helps the cleavage of the O – H bond releasing hydrogen as H+.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 19

Sodium ethoxide has reacted with ethanoyl chloride. The compound that is produced in the above reaction is :

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 19

*Multiple options can be correct
Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 20

Silver Mirror test is given by which one of the following compounds?

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 20

Both for maldeh yde an d a cetaldeh yde give silver mirror with Tollen’s reagent.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 21

Iodoform can be prepared from all except : 

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 21

Iodoform is given by 
1) methyl ketones R-CO-CH3
2) alcohols of the type R-CH(OH)CH3
where R can be hydrogen also

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 22

In the given transformation, which of the following is the most appropriate reagent ?

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 22

Aldehydes and ketones canbereduced to hydrocarbons by the action (i) of amalgamated zinc and concentrated hydrochloric acid (Clemmensen reduction), or (b) of hydrazine (NH2NH2) and a strong base like NaOH, KOH or potassium tert-butoxide in a high-boiling alcohol like ethylene glycol or triethylene glycol (Wolf-Kishner reduction)

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 23

The most suitable reagent for the conversion of R - CH2 - OH → R- CHO is:

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 23

An excellent reagent for oxidation of 1° alcohols to aldehydes is PCC.

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 24

In the reaction,

the product C is:

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 24

Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 25

In the following sequence of reactions :

the product C is :

Detailed Solution for Test: 35 Year JEE Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - Question 25

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