Compounds having the same molecular formula but different number of carbon atoms ( alkyl groups) on either side of functional group ( i.e., -O-,-S-, -NH-, -C(=O)-) are called metamers and the phenomenon is called metamerism. metamerism occurs amongst the members of the same homologus family.For example,
 
CH3CH2-O-CH2CH3 is metamer of CH3-O-CH2CH2CH3 OR CH3-O-CH(CH3)2
 
CH3CH2COCH2CH3 is metamer of CH3COCH2CH2CH3 OR CH3COCH(CH3)2
 
It may be noted that metamers may also be position isomers, e.g., pentan-2-one and pnetan-3-one may be regarded as position isomers as well as metamers.
						

							HELLO,HI,NAMESTE SALAM VALEKUM   chlo ab aapko apka ans. Btati huCompound having the same molecular formula bt different carbon atoms(alkyl groups) on either side of functional group( I.e.,-O-S-,-NH-,-C(=0)-) are called metamers and the pheneomenon is called metamerism.OR You can`t understand I write another one that is.......A compound exhibiting metamerism with one or more other compound.  I hope u understand. Plz approved my ans. If you understand.  Biiiiii.★