Question

The pigment responsible for red color in tomato has one functional group. The CORRECT statement(s) about this functional group is (are)

• A. It decolorizes bromine water
• B. It gives hydrazone derivative on reaction with 2,4-dinitrophenylhydrazine
• C. It gets cleaved on reaction with ozone
• D. It gives positive silver mirror test

Hint:

Lycopene is a conjugated polyene hydrocarbon. Alkenes decolorize bromine water and undergo ozonolysis but do not give 2,4-DNP or Tollen’s tests.

Answer 1

The Correct Option is A, C

Step 1: Identify the functional group.
The red pigment in tomato is lycopene, which contains a long chain of conjugated double bonds (polyene).
Step 2: Reactions of alkenes.
- Alkenes decolorize bromine water due to electrophilic addition → (A) is correct.
- Ozonolysis cleaves C=C bonds to form carbonyl compounds → (C) is correct.
- The 2,4-DNP and silver mirror tests apply to carbonyl compounds, not alkenes → (B) and (D) are incorrect.
Step 3: Conclusion.
Correct statements: (A) and (C).