Which series of compounds can be prepared by oxidation of primary alcohols?

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Solution

Oxidation of primary alcohols gives aldehydes. Further oxidation gives carboxylic acids.
$R - C H_{2} - O H oxidation - ---- \to R - C H O oxidation - ---- \to R - C O O H$
For example, ethanol on oxidation gives acetaldehyde. On further oxidation, acetaldehyde gives acetic acid.
$C H_{3} - C H_{2} - O H oxidation - ---- \to C H_{3} - C H O oxidation - ---- \to C H_{3} - C O O H$

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Q. Primary alcohols can be prepared from alkenes by:

Which of the following is true regarding preparation of aldehydes and ketones ?
(i) Both can be prepared by the oxidation of the concerned alcohol with copper at about $250^{\circ} C$
(ii) Both can be prepared by the oxidation of the concerned alcohol by oppenauer oxidation.
(iii) Both can be prepared by the oxidation of respective alcohol with acidic dichromate.

Q. Primary alcohol can not be prepared by the reduction of________.

Q. Assertion (A):

C H_{3} C H_{2} O H

can be converted into

C H_{3} C H O

by treatment with pyridinium chlorochromate.

Reason (R): PCC is a better reagent for oxidation of primary alcohols to aldehydes.
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