Question

The reagents most suitable for converting primary alcohol into an aldehyde is:

• A. $K_{2}C{r}_2{O}_7$ and $H_{2}S{O}_4$
• B. $KMn{O}_4$ and $NaOH$
• C.
• D. $HN{O}_3$

Answer 1

The correct option is C

(a)
Potassium permanganate (KMnO₄) is a powerful oxidant able to react with primary alcohol to form carboxylic acid.

(b) Similarly, K₂Cr₂O₇ with H₂SO₄ act as a strong oxidizing agent that can change primary alcohols to carboxylic acid.

(c) By using mild oxidizing agents i.e., PDC or PCC, we can convert primary alcohols to aldehyde.


(d) $R-C{H}_2-OH\stackrel{HN{O}_3}{\to }R-COOH$
\ HNO₃ is a strong oxidizing agent; therefore it converts primary alcohol into a carboxylic acid.

Hence, the correct option is (c).