Question

Given below are two statements:
Statement I: All the pairs of molecules (PbO, PbO₂); (SnO, SnO₂) and (GeO, GeO₂) contain amphoteric oxides.
Statement II: Glycine does not have any chiral carbon.
In the light of the above statements, choose the correct option.

• A. Both Statement I and Statement II are correct.
• B. Both Statement I and Statement II are incorrect.
• C. Statement I is correct and Statement II is incorrect.
• D. Statement I is incorrect and Statement II is correct.

Hint:

GeO is acidic, and only glycine lacks a chiral carbon. Amphoteric oxides can react with both acids and bases.

Answer 1

The Correct Option is D

To determine the correct option, we need to analyze each statement provided in the question:

Statement I: All the pairs of molecules (PbO, PbO₂); (SnO, SnO₂) and (GeO, GeO₂) contain amphoteric oxides.

• Amphoteric oxides have the ability to react with both acids and bases. They can act both as an acid and a base to form salts and water.
• In the given pairs, PbO₂, SnO₂, and GeO₂ are known to be amphoteric. However, only SnO is amphoteric; PbO and GeO are predominantly basic oxides.
• Thus, Statement I is incorrect as not all listed oxides in the pairs are amphoteric.

Statement II: Glycine does not have any chiral carbon.

• A chiral carbon atom is a carbon atom that is attached to four different types of atoms or groups.
• Glycine is the simplest amino acid with the formula NH₂CH₂COOH. The central carbon atom in glycine is bonded to two hydrogen atoms, an amino group, and a carboxyl group.
• Since two of the groups are identical (both are hydrogen), glycine does not have a chiral center.
• Therefore, Statement II is correct.

Conclusion: Based on the analysis, Statement I is incorrect and Statement II is correct. Thus, the correct option is:

Statement I is incorrect and Statement II is correct.