The compound which shows metamerism is: 

1. C3H6O 2. C4H10O
3. C5H12 4. C3H8O
Subtopic:  Structural Isomers |
 65%
From NCERT
NEET - 2021
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 and  are-

1. Resonating structures

2. Tautomers

3. Geometrical isomers

4. Optical isomers

Subtopic:  Structural Isomers |
 72%
From NCERT
AIPMT - 2002
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