Which of the following is a suitable reagent that will quickly distinguish between pentanal and 3-pentanone? why methanol doesn't give positive iodoform test while ethanol gives positive results ? 0 0. Lv 4. When ethanol is warmed with iodine in the presence of NaOH, it forms a yellow colored precipitate but methanol do not react positively to Iodoform test. Answer Save. Ethanol gives a yellow precipitate when treated with I2/NaOH while methanol does not give. 3 Answers. 43. Darla. Iodoform Test Alcohol. 3806 Views. Mix sodium hydroxide (NAOH) and iodine (I2) in methanol. 7 years ago. Lots of secondary alcohols give this reaction, but those that do all have a methyl group attached to the carbon with the -OH group. (C) on reaction with Cu at 573 K will give Propanone as (D). To give a positive Haloform test a molecule must have at least two carbon atoms. Answer. 5 years ago. Acetaldehyde gives iodoform test with Iodine and alkali, benzaldehyde does not give iodoform test. Benzaldehyde and butanal V. phenol and cyclohexane 2) (Acetone, propanal, benzladehyde) A. Tollens ... Identify which of the following compounds would give positive iodoform test. An organic compound (A) of molecular formula C 3 H 8 O gives blue colour in Victor Meyer’s test. Ethanol is the only primary alcohol to give the triiodomethane (iodoform) reaction. a. Na metal b. NH2OH c. 2,4-DNP d. Ag(NH 3) 2 + OH-4. thanks and peace! Methanol and ethanol are distinguished by a type of test known as Iodoform. Arrange the following compounds in the ascending order of their basic strength and give reasons for your answer: Methylamine, Aniline, Ethylamine, Diethyl ether. Methanol and ethanol can be distinguished by using iodoform test. DrBob1. Propan – 2 – ol is secondary alcohol and so it gives blue colour in Victor Meyer’s test. Source(s): https://shrinkurl.im/a8dzC. Ethanol and methanol IV. If "R" is a hydrocarbon group, then you have a secondary alcohol. These must be the first two carbons in a chain and carbon number two must have an oxygen atom … 3. Favourite answer. A yellow precipitate of CHI3 (iodoform) will indicate the presence of methanol. Relevance. Methanol can be detected by using the iodoform test. Lv 7. please answer briefly! Question 15. 4.