Question

Baeyers strain theory and its limitation

Answer 1

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Dalton’s atomic theory consists of following postulates:

(i) Matter is made up of very small particles called atoms.

(ii) Atoms can neither be created nor destroyed.

(iii) Atoms of similar substances are similar in all respects (mass, shape and properties)

(iv) Atoms of different substances are different in all respects(mass, shape and properties)

(iv) Atoms of elements combine in the ratio of whole numbers to produce a large number of compound-atoms of a new substance.

Limitations of Dalton’s atomic theory

Dalton’s atomic theory suffered from the following drawbacks:

(i) It failed to explain how and why atoms of different elements combine together to form a new ‘group of atoms’.

(ii) It failed to explain how atoms of different elements differ from each other i.e the structure of atom was unknown.

(iii) It failed to explain the nature of the binding forces between different atoms in a molecule.

(iv) According to Dalton, an atom is indivisible, whereas, it can be divided into sub- atomic particles- electrons, protons and neutrons.

(v) Atoms of the same element can differ from each other.Example – isotopes (atoms of the same element with different masses)

(vi) Atoms of different elements can have same masses (isobars).

Answer 2

Hi there,

Adolf Baeyer proposed a theory to explain the relative stability of cycloalkanes. The limitations of Baeyer's theory are

1. Baeyer was unable to explain the effect of angle strain in Larger Ring System.

2. Baeyer proposed that the cyclopentane should be much Stable than cyclohexane but cyclohexane has zero angle strain.

3. Larger ring systems are not possible but they exist and highly stable.

Hope it helps you.