Draw the structrue and name the product formed if the following alcohols are oxidized. Assume that an excess of oxidising agent is used.
(i) `CH_(3)CH_(2)CH_(2)CH_(2)OH`
(ii) 2-butenol
(iii) 2-methyl-1-propanol

Explanation

(i) Oxidation of saturated alcohols is usually carried out with strong oxidising gents such as `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)` or `KMnO_(4)//OH^-` which first gives the corresponding aldehydes annd then the corresponding acids. For example,
`underset("1-Butanol")(CH_(3)CH_(2)CH_(2)CH_(2)OH) underset([O])overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to underset("Butanal")(CH_(3)CH_(2)CH_(2)CHO) underset([O])overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to underset("Butanoic acid")(CH_(3)CH_(2)CH_(2)COOH)`
(ii) Oxidation of unsaturated alcohols such as 2-butenol is carried out with `PC C//CH_(2)Cl` because oxidation with stronger oxidising aents such as `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)` or `KMnO_(4)//OH^(-)` will bring about cleavage at the double bond. further, with `PC C//CH_(2)Cl_(2)`, oxidation stops at the aldehyde stage evenn if excess o the reagent is used.
`underset("2-Butenol")(CH_(3)-CH=CH-CH_(2)OH) underset([O])overset(P C C//CH_(2)Cl_(2))to underset("2-Butenal")(CH_(3)-CH-CHO)`
(iii) `underset("2-Methyl-1-propanol")(CH_(3)-overset(CH_(3))overset(|)(C)H-CH_(2)OH) underset([O])overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to underset("2-Methylpropanal")(CH_(3)-overset(CH_(3))overset(|)(C)H-CHO) underset([O])overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to underset("2-Methylpropanoic acid")(CH_(3)-overset(CH_(3))overset(|)(C)H-COOH)`