(i) Write one chain isomer of 1-methoxy-2-methyl propane.
(ii) Write one functional isomer of methoxymethane
(iii) Write one metamer of ethoxyethane.

Explanation

(i) `underset("1-Methoxy-2-methylpropane")(CH_(3)-O-CH_(3)-"" underset(CH_(3)) underset(|)(CH))-CH_(3) " "underset("1-Methoxybutane")(CH_(3)-O-CH_(2))-CH_(2)-CH_(3)`
(ii) `underset("Methoxymethane")(CH_(3)OCH_(2)) " " underset("Ethanol")(CH_(3)CH_(2)OH)`
(iii) `underset("Ethoxyethane")(CH_(3)CH_(2)OCH_(2)CH_(3)) " " underset("Methoxypropane")(CH_(3)CH_(2)CH_(2)OCH_(3))`