Which of the following compounds will produce yellow/ orange precipitate with 2,4 dinitrophenylhydrazine? \(i\). \(CH -\) \({ }_{3} CH _{2} OH\) ii. \(CH _{3} CH _{2} CH ( OH )\) iii. \(CH _{3} CHO\) iv. \(CH _{3} COCH _{3}\)
A. i & ii B. i, ii & iii C. iii & iv D. i, ii, iii & iv
Correct Answer: C
Explanation
(i) and (ii) are alkanols, (iii) is an alkanal (aldehyde) while (iv) is an alkenone (ketone). Aldehydes and ketones react with 2,4 dinitro-phenylhydrazine to form yellow, orange or reddish orange precipitates whereas alkanols do not.
