Define position isomerism and provide an example.
(N/A) When two or more compounds differ in the position of a substituent atom or functional group on the carbon skeleton,they are called position isomers,and this phenomenon is termed as position isomerism.
Example: The molecular formula $C_3H_8O$ represents two alcohols because the same functional group $-OH$ is present,but its position differs.
Example structures: Propan$-1-$ol $(CH_3-CH_2-CH_2-OH)$ and Propan$-2-$ol $(CH_3-CH(OH)-CH_3)$.
Example: The molecular formula $C_3H_8O$ represents two alcohols because the same functional group $-OH$ is present,but its position differs.
Example structures: Propan$-1-$ol $(CH_3-CH_2-CH_2-OH)$ and Propan$-2-$ol $(CH_3-CH(OH)-CH_3)$.
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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
| 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 |
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