Jones Reagent is:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → \(CrO_3 | H_2SO_4\)
Jones reagent is chromium trioxide (\( \ce{CrO3} \)) in aqueous sulphuric acid (acidic medium). It is a strong oxidising agent: primary alcohols are oxidised to carboxylic acids and secondary alcohols to ketones.
\( \displaystyle \ce{RCH2OH} \xrightarrow{\ce{CrO3}-\ce{H2SO4}} \ce{RCOOH} \)
NCERT (2026-27 edition):
Methods of Preparation of Carboxylic Acids – …
