Test Index

Aldehydes, Ketones and Carboxylic Acids

Section: Physics

Question : 2 of 77

Marks: +1, -0

S on warming with ammoniacal AgNO_{3} results in the formation of silver mirror.
Q on treatment with Cl_{2}(excess)/UV gives gammaxane.
T is a heterocyclic compound.
R on acid catalyzed intramolecular cyclization followed by treatment with Zn-Hg/HCl gives 9,10-dihydroxyanthracene.

Solution:

Concept:

Identifying major products in a multi-step organic reaction sequence and evaluating given statements.

Explanation:

The sequence starts with benzene.

Chlorination of benzene under UV light with excess

\mathrm{Cl}_2

gives gammaxane (

\mathrm{C}_6\mathrm{H}_6\mathrm{Cl}_6

Thus Q is benzene and statement B is correct.

R is formed from Q and undergoes further transformations.

S gives a silver mirror with ammoniacal

\mathrm{AgNO}_3

, indicating the presence of an aldehyde or terminal alkyne group.

Statement A is correct.

T is a cyclic compound containing a heteroatom (e.g., oxygen or nitrogen), making it heterocyclic.

Thus statement C is correct.

Statement D is incorrect because the product described (9,10-dihydroxyanthracene) does not form from the given reaction path.

Answer:

A, B, C

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