Choose the pair of chain isomers.

Match the column $I$ with column $II$.

Column $I$ (Compounds)	Column $II$ (Relation)
$(i)$ $CH_3-CH_2-C(CH_3)_2-Cl$ and $(CH_3)_3C-Cl$	$(P)$ Homologues
$(ii)$ $C_6H_5-O-CH_2-CH_3$ and $C_6H_5-O(CH_3)-CH_3$ (ortho-methylanisole)	$(Q)$ Functional group isomers
$(iii)$ $C_6H_5-O-CH_3$ and $2-methylphenol$	$(R)$ Metamers
$(iv)$ $CH_3-CH(CH_3)-CH_2-OH$ and $(CH_3)_3C-OH$	$(S)$ Position isomers

Which of the following compounds are isomers of propionic acid?

Given below are two statements :
Statement $(I) :$ $CH_3CH=CHCH_3$ and $cyclobutane$ are isomeric compounds.
Statement $(II) :$ $CH_3CH_2CH_2CH_2NH_2$ and $(CH_3CH_2)_2NH$ are functional group isomers.
In the light of the above statements,choose the correct answer from the options given below :

Tautomerism is exhibited by:

Which of the following compounds is asymmetric?