Question

S. In this question, indicate what you would do and the observations you would expect for each case. Describe how to distinguish between each of the Be explicit in your explanations. Use simple chemical tests (not including spectroscopy) whenever possible and more elaborate tests for other cases. following a. 1-phenylpropyne and 3-phenylpropyne (1 point) b. phenol and p-hydroxybenzyl alcohol (1 point) c. 1,2-dibromo-1-phenylethane (m.p. 73°C) and 1,4-dibromo-2,5-dimethylbenzene (m.p. 74°C) (1 point) Page 4 of 5

Answer 1

a) Tollens reagent (silver nitrite + ammonium hydroxide) reacts with Acetylene derivative that is with 3-phenylpropyne to form silver acetylide which precipitateout of solution while there will be no reaction with 1-phenylpropyne.

b) Phenols reacts with ferric chloride to formed coloured complex while there will not be any reaction with ferric chloride

c) 1,2 dibromo-1 phenylethane on reaction with sodium hydroxide would result alkyne while there will no reaction for 1,2 dibromo, 2,5 dimethyle benzene