-
Engineering and Architecture
Exams
Colleges
Predictors
Resources
-
Computer Application and IT
Quick Links
Colleges
-
Pharmacy
Colleges
Resources
-
Hospitality and Tourism
Colleges
Resources
Diploma Colleges
-
Competition
Other Exams
Resources
-
School
Exams
Top Schools
Products & Resources
-
Study Abroad
Top Countries
Student Visas
-
Arts, Commerce & Sciences
Exams
Colleges
Upcoming Events
Resources
-
Management and Business Administration
Colleges & Courses
Predictors
-
Learn
Online Courses
Engineering Preparation
Medical Preparation
-
Online Courses and Certifications
Top Streams
Specializations
- Digital Marketing Certification Courses
- Cyber Security Certification Courses
- Artificial Intelligence Certification Courses
- Business Analytics Certification Courses
- Data Science Certification Courses
- Cloud Computing Certification Courses
- Machine Learning Certification Courses
- View All Certification Courses
Resources
-
Medicine and Allied Sciences
Colleges
Predictors
Resources
-
Law
Resources
Colleges
-
Animation and Design
Predictors & Articles
Colleges
Resources
-
Media, Mass Communication and Journalism
Colleges
Resources
-
Finance & Accounts
Top Courses & Careers
Colleges
Get Answers to all your Questions
- #Organic Chemistry - some Basic principles and techniques
- #Medical
- #National Eligibility Cum Entrance Test
- #Chemistry
Q.76) Which one of the following NOT belong to "Lassaigne's test"?
A) $2 \mathrm{CuO}+{\mathrm{C}} \underset{\Delta}{\longrightarrow} 2 \mathrm{Cu}+\mathrm{CO}_2$
B) $\mathrm{Na}+\mathrm{C}+\mathrm{N} \xrightarrow[\Delta]{ } \mathrm{NaCN}$
C) $2 \mathrm{Na}+\mathrm{S}{\longrightarrow} \mathrm{Na}_2 \mathrm{~S}$
D) $\mathrm{Na}+\mathrm{X} \xrightarrow[\Delta]{ }+\mathrm{NaX}$
Answers (1)
Q.76) $$
2 \mathrm{CuO}+\mathrm{C} \xrightarrow{\Delta} 2 \mathrm{Cu}+\mathrm{CO}_2
$$
This reaction does not belong to the Lassaigne's test.
Explanation:
Lassaigne's test is a qualitative analysis used to detect nitrogen, sulfur, and halogens in an organic compound. It involves fusion with sodium ( Na ) to convert these elements into ionic, water-soluble forms that can be detected by specific tests.
Here's what the other options represent:
- (2): Formation of NaCN - used to detect nitrogen.
- (3): Formation of $\mathrm{Na}_2 \mathrm{~S}$ - used to detect sulfur.
- (4): Formation of NaX - used to detect halogens $(\mathrm{X}=\mathrm{Cl}, \mathrm{Br}, \mathrm{I})$.
Option (1), involving CuO and C, is a reduction reaction, not part of Lassaigne's test.
It's unrelated to the sodium fusion method and is typically seen in inorganic reduction reactions or metallurgy.
Hence, the correct answer is option (1).
NEET 2024 Most scoring concepts
- Just Study 32% of the NEET syllabus and Score up to 100% marks
