Chemistry Part-II
Class 12
NCERT
1
Chapter 1: Haloalkanes and Haloarenes
33 questions
2
Chapter 2: Alcohols, Phenols and Ethers
38 questions
3
Chapter 3: Aldehydes, Ketones and Carboxylic Acids
26 questions
Q1
Give plausible explanation for each of the following:
(i) Cyclohexanone forms cyanohydrin in good yield but 2,2,6-trimethylcyclohexanone does not.
(ii) There are two groups in semicarbazide. However, only one is involved in the formation of semicarbazones.
(iii) During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the ester should be removed as soon as it is formed.
(i) Cyclohexanone forms cyanohydrin in good yield but 2,2,6-trimethylcyclohexanone does not.
(ii) There are two groups in semicarbazide. However, only one is involved in the formation of semicarbazones.
(iii) During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the ester should be removed as soon as it is formed.
Q2
An organic compound contains % carbon, % hydrogen and rest oxygen. The molecular mass of the compound is . It does not reduce Tollens reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation, it gives ethanoic and propanoic acid. Write the possible structure of the compound.
Q3
Give names of the reagents to bring about the following transformations:
(i) Hexan-1-ol to hexanal
(ii) Cyclohexanol to cyclohexanone
(iii) -Fluorotoluene to
(iv) Ethanenitrile to ethanal
-fluorobenzaldehyde
(v) Allyl alcohol to propenal
(vi) But-2-ene to ethanal
View all question4
Chapter 4: Amines
18 questions
5
Chapter 5: Biomolecules
25 questions
6
Chapter 6: Polymers
21 questions
7
Chapter 7: Chemistry in Everyday Life
27 questions
Question
Hard
Solving time: 6 mins
An organic compound contains % carbon, % hydrogen and rest oxygen. The molecular mass of the compound is . It does not reduce Tollens reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation, it gives ethanoic and propanoic acid. Write the possible structure of the compound.
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Text solution
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An organic compound contains carbon, hydrogen and rest oxygen. The molecular mass of the compound is .
Simple atomic ratio
The empirical formula is
Empirical formula mass . It is equal to molecular formula mass. Hence, molecular formula is same as empirical formula.
It does not reduce Tollens reagent. Hence, it is not an aldehyde
It forms an addition compound with sodium hydrogensulphite.
Hence, it contains carbonyl group.
It give positive iodoform test.
Hence, it is a methyl ketone
On vigorous oxidation it gives ethanoic and propanoic acid.
Hence, it is -pentanone.
Simple atomic ratio
The empirical formula is
Empirical formula mass . It is equal to molecular formula mass. Hence, molecular formula is same as empirical formula.
It does not reduce Tollens reagent. Hence, it is not an aldehyde
It forms an addition compound with sodium hydrogensulphite.
Hence, it contains carbonyl group.
It give positive iodoform test.
Hence, it is a methyl ketone
On vigorous oxidation it gives ethanoic and propanoic acid.
Hence, it is -pentanone.
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Practice more questions from Chemistry Part-II (NCERT)
Q1
Give plausible explanation for each of the following:
(i) Cyclohexanone forms cyanohydrin in good yield but 2,2,6-trimethylcyclohexanone does not.
(ii) There are two groups in semicarbazide. However, only one is involved in the formation of semicarbazones.
(iii) During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the ester should be removed as soon as it is formed.
(i) Cyclohexanone forms cyanohydrin in good yield but 2,2,6-trimethylcyclohexanone does not.
(ii) There are two groups in semicarbazide. However, only one is involved in the formation of semicarbazones.
(iii) During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the ester should be removed as soon as it is formed.
Q2
An organic compound contains % carbon, % hydrogen and rest oxygen. The molecular mass of the compound is . It does not reduce Tollens reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation, it gives ethanoic and propanoic acid. Write the possible structure of the compound.
Q3
Give names of the reagents to bring about the following transformations:
(i) Hexan-1-ol to hexanal
(ii) Cyclohexanol to cyclohexanone
(iii) -Fluorotoluene to
(iv) Ethanenitrile to ethanal
-fluorobenzaldehyde
(v) Allyl alcohol to propenal
(vi) But-2-ene to ethanal
View allPractice questions from Chemistry Part-II (NCERT)
Question 1
Easy
Views: 5,922
Question 2
Medium
Views: 6,395
(i) PropanonetoPropene
(ii) Benzoic acid to Benzaldehyde
(iii) Ethanol to 3-Hydroxybutanal
(iv) Benzene to m-Nitroacetophenone
(v) Benzaldehyde to Benzophenone €“
(vi) Bromobenzeneto 1-PhenylethanoL
(vii) Benzaldehyde to 3-Phenylpropan-1-ol.
(viii) Benzaldehyde to α Hydroxyphenylacetk acid
(ix) Benzoic acid to m-Nitrobenzy 1 alcohol
Question 3
Medium
Views: 5,889
Question 4
Medium
Views: 5,636
(i) the amide which gives propanamine by Hoffmann bromamide reaction.
(ii) the amine produced by the Hoffmann degradation of benzamide.
Practice more questions from Aldehydes, Ketones and Carboxylic Acids
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| Question Text | An organic compound contains % carbon, % hydrogen and rest oxygen. The molecular mass of the compound is . It does not reduce Tollens reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation, it gives ethanoic and propanoic acid. Write the possible structure of the compound. |
| Updated On | Jan 21, 2024 |
| Topic | Aldehydes, Ketones and Carboxylic Acids |
| Subject | Chemistry |
| Class | Class 12 |
| Answer Type | Text solution:1 Video solution: 6 |
| Upvotes | 660 |
| Avg. Video Duration | 6 min |
