| ⇦ | 
| ⇨ |
Phenol is heated with pthalic anhydride in the presence of concentrated H₂SO₄.The product gives pink colour with alkali. The product is
Options
(a) salicylic acid
(b) bakelite
(c) phenolphthalein
(d) fluorescein
Correct Answer:
phenolphthalein
Explanation:
When phenol is heated with phthalic anhydride and a few drops of concentrated sulphuric acid (H₂SO₄) are added, phenolphthalein is formed. On adding excess of sodium hydroxide to this product, a pink colour is produced. This process is called phthalein fusion test.
Related Questions: - Which of the following shows linear structure
- Benzenediazonium chloride on treated with water gives
- Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together
- The standard heat of formation of carbon disulphide (l) given that the standard
- If electron has spin quantum number +1/2 and magnetic quantum number –1,it cannot
Topics: Alcohols Phenols and Ethers
(80)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which of the following shows linear structure
- Benzenediazonium chloride on treated with water gives
- Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together
- The standard heat of formation of carbon disulphide (l) given that the standard
- If electron has spin quantum number +1/2 and magnetic quantum number –1,it cannot
Topics: Alcohols Phenols and Ethers (80)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply