Question Detail

CHM 102 Qualitative and Quantitative Analysis in Organic Chemistry Objective Question
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Question

What interference can occur if both nitrogen and sulfur are present in an organic compound during Lassaigne's test?
Options
A Formation of sodium thiocyanate (NaSCN), giving a blood-red color with FeCl₃
Correct Answer
B No reaction
C Formation of a white precipitate
D Evolution of oxygen gas
Correct Answer

Option A is the correct answer.

Detailed Explanation

When both N and S are present, sodium thiocyanate (NaSCN) forms. This gives a blood-red color with FeCl₃, which can be mistaken for a positive nitrogen test.

Hint

Red color interference.

Question Info

Course: CHM 102
Topic: Qualitative and Quantitative Analysis in Organic Chemistry
Type: Objective
Difficulty: Not specified
Question 809 of 1999
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