Hey
C is correct because firstly it is a secondary alcohol and can be oxidised to carboxylic acid as pottasium dichromate act as an oxidising agent and itself turns green during the reaction. Moreover, it can react with carboxylic acid to form an ester.
A is incorrect because tertiary alcohol does not change the colour of potassium dichromate.
B is a carboxylic acid and it cannot be oxidised by potassium dichromate even though it can be esterified.
And D is a ketone it fails to fulfill the first condition as it cannot be esterified.
hello! thank you for a nicely worded explanation. I have a question, where can I find information simply enough to memorize for imat about colors changing and solutions (basically what you explained)?