April 2025
Intermediate to advanced
608 pages
27h 36m
English
book
Pearson JEE Main Chemistry Vol 2 – 2026 | As Per NTA Syllabus | 2021 to 2025 Solved Previous Years’ Questions | 5000+ Topic-wise, Miscellaneous and Numerical–Based ... Papers on MyInsights | 7th Edition
by A.K. Singhal, U.K. Singhal
Content preview from Pearson JEE Main Chemistry Vol 2 – 2026 | As Per NTA Syllabus | 2021 to 2025 Solved Previous Years’ Questions | 5000+ Topic-wise, Miscellaneous and Numerical–Based ... Papers on MyInsights | 7th Edition
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13 |
Practical Chemistry |
DETECTION AND IDENTIFICATION OF FUNCTIONAL GROUP
Detection and Identification of –OH Group
There are three tests which can be used to detect the presence of a hydroxyl group in an unknown organic compound. For these tests, we can use the liquid substance or a solution of the solid substance in dry ether or benzene.
• Take this solution and add small pieces of sodium metal in it. If bubbles of hydrogen are given off, it confirms the presence of –OH group.
2ROH + 2Na → 2RONa + H2
• Take this solution and add phosphorous pentachloride in it. If the mixture becomes warm with liberation of HCl gas, it confirms that the given substance is a hydroxyl compound.
ROH + PCl5 → RCl + POCl3 + HCl ↑
• Add acetyl chloride or benzoyl ...
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