12th Class Chemistry Chapter 13 MCQs with Answers

12th Class Chemistry Chapter 13 MCQs with Answers: The twelfth-grade chemistry chapter on carboxylic acids delves into the fascinating world of organic compounds containing the carboxyl functional group (-COOH). Students will explore the fundamental characteristics, properties, and reactions of these compounds, gaining an understanding of their importance and applications in various fields.

12th Class Chemistry Chapter 13 MCQs with Answers

The chapter proceeds to examine the physical properties of carboxylic acids, including their solubility behavior, boiling points, melting points, and acidity. Students will explore the factors that influence these properties and understand the relationship between molecular structure and physical characteristics.

Next, the chapter delves into the methods of preparing carboxylic acids. Students will study the oxidation of primary alcohols and aldehydes, hydrolysis reactions involving nitriles and esters, and the carboxylation of Grignard reagents. Practical examples and reaction mechanisms will be elucidated to facilitate comprehension.

Chapter No 13 Carboxylic Acid

1. Ninhydrin reacts with amino acid to form product which has colour choose which one is correct:

1. Blue
2. Violet
3. Bluish violet
4. Red

2. Slight oxidation of primary alcohol gives choose which one is correct:

1. Ketone
2. Organic acid
3. Aldehyde
4. An ester

3. Which of the following is the strongest acid choose which one is correct:

1. HCOOH
2. CH₃COOH
3. CH₃ − CH₂ − COOH
4. Cl − CH₂ − COOH

4. Which of the following esters shows the flavour of orange choose which one is correct:

1. Benzyl acetate
2. Iso-butyl formate
3. Octyl acetate
4. Ethyl butyrate

5. Which acid is used in the manufacture of synthetic fibre choose which one is correct:

1. Formic acid
2. Acetic acid
3. Carbonic acid
4. Benzoic acid

6. Some amino acids are most important because they are the final product of hydrolysis of peptide and protein and they are choose which one is correct:

1. α-amino acid
2. β-amino acid
3. γ-amino acid
4. All of the above

7. In amino acid proton is transferred from one point to the other point and this dipolar ion is called choose which one is correct:

1. Oxonium ion
2. Carbonium ion
3. Zwitter ion
4. Carbanion

8. Which of the following is neutral amino acid choose which one is correct:

1. Glycine
2. Histidine
3. Lysine
4. Aspartic acid

9. The amino acid which body can synthesize are called choose which one is correct:

1. Essential
2. Non-essential
3. Acidic
4. Basic

10. Amino acids are classified into following types choose which one is correct:

1. Acidic
2. Basic
3. Neutral
4. All

11. By convention a peptide having molecular mass upto 10,000 is called choose which one is correct:

1. Peptide
2. Polypeptide
3. Protein
4. Dipeptide

12. Acetic acid is manufactured commercially by choose which one is correct:

1. Distillation
2. Fermentation
3. Ozonolysis
4. Esterification

13. Which of the following derivative can’t be prepared directly from acetic acid choose which one is correct:

1. Acetic anhydride
2. Acetyl chloride
3. Acetamide
4. Ethyl ethanoate

14. Which reagent is used to reduce a carboxylic group to an alcohol choose which one is correct:

1. H₂/Ni
2. HI/P
3. NaBH₄
4. LiAlH₄

15. The solution of which acid is used for seasoning of food choose which one is correct:

1. Formic acid
2. Acetic acid
3. Benzoic acid
4. Butanoic acid

16. Which one of the following element is not present in all proteins choose which one is correct:

1. Carbon
2. Hydrogen
3. Nitrogen
4. Sulphur

19. Which of the following will react with both ethanol and ethanoic acid at room temperature choose which one is correct:

1. CaCO₃
2. CuO
3. Na-metal
4. CH₃OH

20. Which one of the following is not an amino acid choose which one is correct:

1. Alanine
2. Glycine
3. Aspartic acid
4. Aniline

21. Which one of the following metal can evolve hydrogen from acetic acid choose which one is correct:

1. Na
2. Fe
3. Al
4. Cu

22. Which one of the following is not a dicarboxylic acid choose which one is correct:

1. Malonic acid
2. Valeric acid
3. Maleic acid
4. Succinic acid

24. Reverse of esterification is known as choose which one is correct:

1. Trans esterification
2. Dehydration
3. Hydrolysis
4. Decarboxylation

25. The general formula of monocarboxylic acid choose which one is correct:

1. C_nH_nCOOH
2. C_nH_2n+1COOH
3. C_nH_2nCOOH
4. C_nH_2n−2COOH

26. The simplest of all amino acid choose which one is correct:

1. Lysine
2. Glycine
3. Alanine
4. Aspartic acid

27. Carboxylic acid can be changed to acid chloride by the treatment with choose which one is correct:

1. S₂Cl₂
2. SOCl₂
3. HCl
4. HOCl

28. Which product is not formed when acetic acid reacts with SOCl₂ (Thionyl chloride) choose which one is correct:

1. CH₃Cl
2. CH₃COCl
3. HCl
4. SO₂

29. Which one of the following reagent is used to convert acetic acid to ethane?

1. LiAlH₄
2. HI and Red P
3. P₂O₅
4. SOCl₂ and pyridine

30. The weakest carboxylic acid choose which one is correct:

1. HCOOH
2. CH₃CH₂COOH
3. CH₃COOH
4. ClCH₂COOH