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Class 11 NEET Chemistry Organic Chemistry Some Basic Principles And Techniques Part 2

Section: Chemistry

Question : 3 of 30

Marks: +1, -0

During Lassaigne's test, the elements present in an organic compound are converted from :

[NEET 3 May 2026]

Ionic form to ionic form
Covalent form to ionic form
Covalent form to covalent form
Ionic form to covalent form

Validate

Solution:

Concept:

Lassaigne's test uses sodium metal to convert the covalently bonded elements of an organic compound into ionic sodium salts, which can then be detected by simple ionic tests.

Chemical Equations:

For nitrogen:

\mathrm{C + N + Na \rightarrow NaCN}

For sulphur:

\mathrm{S + 2Na \rightarrow Na_2S}

For halogens:

\mathrm{X + Na \rightarrow NaX}

(where

\mathrm{X = Cl, Br, I}

)

Explanation:

In an organic compound, elements such as nitrogen, sulphur and halogens are held by covalent bonds.

Covalent species do not give the ionic reactions required for their identification.

Hence the organic compound is fused with sodium metal.

Sodium reduces these elements, giving water-soluble ionic sodium salts such as

\mathrm{NaCN}

\mathrm{Na_2S}

and

\mathrm{NaX}

These ionic salts then undergo the usual ionic tests for

\mathrm{CN^-}

\mathrm{S^{2-}}

and

\mathrm{X^-}

Therefore, the conversion taking place is from covalent form to ionic form.

Answer:

Option B (option B): Covalent form to ionic form

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