6 public questions tagged with this topic.
No reaction with Lassaigne’s test indicates no halogens. CH₃CH₂COCH₂CH₃ (pentan-3-one) is a ketone consistent with C₅H₁₀O.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Structural Isomerism - Chain Position Functional Metamerism
CH₃CH₂CHO (propanal) contains the -CHO group, characteristic of aldehydes.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism
CH₃CH₂COOH (propanoic acid) contains the -COOH group, characteristic of carboxylic acids.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Electronic Effects - Inductive Mesomeric Hyperconjugation and Resonance
No halogen (negative Lassaigne’s test). Degree of unsaturation = 1. CH₃CH₂COCH₂CH₃ (ketone) fits C₅H₁₀O.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Classification and Nomenclature of Organic Compounds - IUPAC
CH₃COCH₃ (acetone) contains a carbonyl group (C=O) attached to two alkyl groups, characteristic of ketones.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Classification and Nomenclature of Organic Compounds - IUPAC
A functional group comprises species that perform similar ecological roles, such as nitrogen fixation, grazing, pollination, or decomposition, even if they are not close relatives. In the redundancy hypothesis, overlap within such a group allows one species to compensate partly for loss of another. A functional relationship should be interpreted by asking whether change is gradual, buffered, abrupt, or irregular. Gradual loss is consistent with accumulating contributions; an initial plateau suggests compensation; an abrupt drop points to loss of a disproportionately important species; and an irregular curve indicates identity-dependent effects. These are conceptual expectations, not immutable laws. Different ecosystem processes—such as productivity, decomposition, pollination, or resistance—may follow different curves in the same community because they depend on different organisms and interactions. In this context, the keyed term, Same ecological role, identifies the relevant mechanism or quantitative relationship and links the observed pattern to its underlying ecological cause. The distinction is testable by measuring changes in organisms, resources, or process rates through time rather than relying on the label alone.
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 20
