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Distinguishing tests

38 questions on Distinguishing tests from the Alcohols, Phenols and Ethers chapter: 6 NEET level, 16 JEE Main, 16 JEE Advanced. Each one opens with its answer and solution.

Practice this topic All Alcohols, Phenols and Ethers topics

Which compound gives a violet colour with neutral FeCl3 solution? NEET level
Several alcohols are warmed with I2 and NaOH. Which of the following does NOT give a yellow precipitate of iodoform? NEET level
A white precipitate is obtained on adding bromine water to NEET level
Which reagent distinguishes propan-1-ol from propan-2-ol? JEE Main level
Which pair of compounds can be distinguished by neutral FeCl3 solution? JEE Main level
Which pair of compounds can be distinguished by sodium metal? JEE Main level
Butan-1-ol, butan-2-ol and 2-methylpropan-2-ol are tested separately with Lucas reagent at room temperature. The observations in the order given are JEE Main level
Which alcohol does NOT turn the orange chromic acid (CrO3 in aqueous H2SO4, Jones reagent) green within a few seconds? JEE Main level
Which reagent distinguishes 2,4,6-trinitrophenol (picric acid) from phenol? JEE Main level
Ceric ammonium nitrate, (NH4)2[Ce(NO3)6], gives a red colour with JEE Main level
Which of the following give a positive iodoform test with I2/NaOH? JEE Main level
A compound X of formula C7H8O liberates H2 with sodium, is insoluble in aqueous NaOH, gives no colour with neutral FeCl3, and is oxidised by PCC to a compound t... JEE Advanced level
P and Q are isomers of C4H10O. P gives turbidity immediately with Lucas reagent and a negative iodoform test. Q gives turbidity after about 5 minutes and a posi... JEE Advanced level
Phenol is converted into P by CHCl3/NaOH followed by H3O+ (major ortho product), and into Q by heating its sodium salt with CO2 at 4-7 atm and 400 K followed by... JEE Advanced level
Glycerol (propane-1,2,3-triol) is treated with excess HIO4. The organic products are JEE Advanced level
A compound of formula C8H10O liberates H2 with sodium, does not dissolve in aqueous NaOH, gives no colour with neutral FeCl3, and gives a yellow precipitate wit... JEE Advanced level
Which of the following compounds give positive results with BOTH sodium metal (H2 evolved) and I2/NaOH (yellow precipitate)? JEE Advanced level
Which statements about distinguishing tests are correct? JEE Advanced level
Which of the following give a white precipitate with excess bromine water? JEE Advanced level
Which of the following gives turbidity immediately with the Lucas reagent (ZnCl2/conc. HCl) at room temperature? NEET level
Which of these compounds gives a violet colour with neutral ferric chloride solution? NEET level
Which of the following gives a yellow precipitate on warming with I2 and aqueous NaOH? NEET level
A liquid of formula C_3H_8O reacts with sodium, becomes turbid with Lucas reagent after about five minutes at room temperature, and gives a yellow precipitate w... JEE Main level
Which reagents can be used to distinguish phenol from cyclohexanol? (Select all that apply.) JEE Main level
Which of the following does NOT turn orange chromic acid (CrO3 in aqueous H2SO4) green within a few seconds? JEE Main level
Which of the following diols does NOT react with periodic acid, HIO4? JEE Main level
With a yellow solution of ceric ammonium nitrate, which of the following gives a red colour? JEE Main level
In the Victor Meyer test, an alcohol is converted to the alkyl iodide, then to the nitroalkane, then treated with HNO2 and made alkaline. A blue colour is obtai... JEE Main level
Benzenediazonium chloride is added to an alkaline solution of each of the following compounds. Which one gives an orange-red azo dye? JEE Main level
Select all compounds that give a yellow precipitate of iodoform with I2 and aqueous NaOH. JEE Main level
Three isomeric alcohols A, B and C of formula C_4H_10O are tested. A gives turbidity immediately with Lucas reagent. B gives turbidity after about 5 minutes and... JEE Advanced level
Three isomers X, Y and Z of formula C_7H_8O are examined. X gives a violet colour with neutral FeCl3 and consumes 3 mol of Br2 per mole with excess bromine wate... JEE Advanced level
In each of the following pairs a test is suggested to distinguish the two compounds. Select all pairs where the test works. JEE Advanced level
One mole of propane-1,2,3-triol (glycerol) is treated with excess periodic acid, HIO4. The number of moles of HIO4 consumed and the organic products are JEE Advanced level
A mixture of phenol, benzoic acid and methoxybenzene in ether is shaken first with aqueous NaHCO3, the ether layer is separated and shaken with aqueous NaOH, an... JEE Advanced level
1-(4-Hydroxyphenyl)ethan-1-one is subjected to various tests. Select the tests that give a positive result. JEE Advanced level
Match the test in Column I with the observation in Column II. Column I: (P) phenol heated with phthalic anhydride and conc. H2SO4, then made alkaline with dilut... JEE Advanced level
A compound C_4H_10O_2 consumes one mole of HIO4 per mole and gives a single organic product, which gives a silver mirror with Tollens reagent and a yellow preci... JEE Advanced level