Home
Class 11
CHEMISTRY
Can Li or K metal be used in place of Na...

Can Li or K metal be used in place of Na during detection of elements by Lassaigne's test ?

Text Solution

AI Generated Solution

**Step-by-Step Solution:** 1. **Understanding Lassaigne's Test**: Lassaigne's test is a qualitative analysis method used to detect the presence of certain elements (like nitrogen, sulfur, and halogens) in organic compounds. Sodium (Na) is typically used in this test because of its reactivity. 2. **Role of Sodium in Lassaigne's Test**: In the test, sodium reacts with the organic compound to form sodium cyanide (NaCN) when nitrogen is present, and sodium sulfide (Na2S) when sulfur is present. The presence of halogens is detected by forming sodium halides (NaX). 3. **Considering Lithium (Li)**: Lithium is less reactive than sodium. This means that it may not react efficiently with the organic compound to form the necessary sodium salts (like NaCN or Na2S) needed for the test. Therefore, using lithium could lead to inconclusive or poor results. ...
Promotional Banner

Topper's Solved these Questions

  • ORGANIC CHEMISTRY-SOME BASIC PRINCIPLES TECHNIQUES

    PRADEEP|Exercise Problem For Practice|27 Videos

  • ORGANIC CHEMISTRY-SOME BASIC PRINCIPLES TECHNIQUES

    PRADEEP|Exercise Test Your Grip (Multiple Choice Questions)|19 Videos

  • ORGANIC CHEMISTRY-SOME BASIC PRINCIPLES TECHNIQUES

    PRADEEP|Exercise Competition Focus (Jee (Main and Advanced)/Medical Entrance) VIII. Assertion-Reason Type Questions|25 Videos

  • HYDROGEN

    PRADEEP|Exercise COMPETITION FOCUS (Assertion-Reason Type Questions) Type 2|15 Videos

  • P-BLOCK ELEMENTS (NITROGEN FAMILY)

    PRADEEP|Exercise Competition focus jee(main and advanced)/ medical entrance special) (VIII. Assertion-Reason Type Questions)|10 Videos

Similar Questions

Explore conceptually related problems

Here paragraphs are given. Based upon the paragraphs some multiple choice questions are given. Each question has 4 choices A, B, C and D. Out of which one is correct. Choose the correct option Paragraph/comprehension In the detection of elements by Lassaigne’s test, the covalent compounds are converted into ionic compounds on fusion with sodium metal. The nitrogen, sulphur and halides present in the organic compounds are test with their usual tests. In this test blue or green colour is obtained when only nitrogen is present whereas red colour is obtained when both nitrogen and sulphur are present. The Lassaigne’s extract is boiled with HNO_(3) so as to decompose Na_(2) and NaCN if present. Phosphorus is detected in the organic compound by fusing it with sodium peroxide. When sodium phosphate formed is detected with cone. HNO_(3) and ammonium molybdate. During detection of phosphours in an organic compound,yellow precipitate are formed due to the formation of

Qualitative analysis of organic compounds is performed by Lassaigne's test by fusion with metallic sodium, by which the covalent compounds are converted into ionic compounds. Extra elementsline N,S,P andhalogensaredetected by their usual tests. Q. Prussian blue colour in the detection of nitrogen in lassaigne's test in due to the fomation of:

The element which cannot be detected by Lassaigne's test is