The first stage involves substitution of all three hydrogens in the methyl group by iodine atoms. (ii) CH 3 COOH (Acetic acid) and HCOOH (Formic acid). The reaction of iodine, a base and a methyl ketone gives a yellow precipitate along with an “antiseptic” smell. Step 1: First, an acid-base reaction. Acetophenone (C6H5COCH3) contains the group CH3CO attached to carbon and hence give iodoform test . (a) (i) Benzoic acid on warming with sodium hydrogen carbonate gives brisk effervescence of CO 2 gas while ethyl benzoate does not respond to this test (ii) Benzaldehyde and acetophenone Iodoform test: Acetophenone being a methyl ketone on treatment with I 2 /NaOH undergoes Iodoform reaction to give yellow ppt. (a) Sodium acetate (b) Resinous mass (c) Aldol (d) Ethyl acetate. C6H5COCH3 + 3I2 + 4NaOH give CHI3 + C6H5COONa + 3NaI + 3 H2O C6H5COC6H5 + I2 + NaOH give no reaction C6H5COC. The group to which the CH 3 —CO group is attached can be aryl, alkyl and hydrogen. Which compound is obtained when acetaldehydes are treated with dilute solution of caustic soda? Iodoform test is used to check the presence of carbonyl compounds with the structure R-CO-CH3 or alcohols with the structure R-CH(OH)-CH3 in a given unknown substance. Which benzophenone does not give iodoform test . of iodoform. Iodoform test In this test, Acetaldehyde, acetone, and acetophenone were able to exhibit the formation of yellow precipitate after it was added to 10% KI solution (Potassium Iodide) and NaClO. Answer: (a) Question 33. In this experiment you will explore a variant of the haloform reaction, using bleach as the oxidizing agent. The compound should have CH3CO group to show iodoform test . Answer. The compound should have CH 3 CO-group to show the iodoform test. We will take the reagents as being iodine and sodium hydroxide solution. Mechanism of the Classic Iodoform Reaction. Acetophenone, being a methyl ketone on treatment with I2/NaOH undergoes iodoform reaction to give a yellow ppt. By Iodoform test: Acetophenone being a methyl ketone on treatment with I 2 and NaOH (NaOI) undergoes iodoform test to give yellow ppt. of iodoform but benzaldehyde does not. Fill in the reagents for the given conversation: Answer. The presence of hydroxide ions is important for the reaction to happen - they take part in the mechanism for the reaction (not required for UK A level). one year ago Think You Can Provide A Better … Answer: (c) Aldol. Question 32. On the other hand, benzaldehyde does not give this test. The iodoform test is commonly used as a test for the CH 3 —CO group. Equations for the triiodomethane (iodoform) reaction. Answer: (b) Pentan-2-one will give iodoform test. Question 34. of iodoform on heating whereas benzaldehyde does not. This is because acetaldehyde, acetone and acetophenone contains a methyl group beside the carbonyl group or the alpha position. Acetophenone (C 6 H 5 COCH 3) contains the group CH 3 CO attached to carbon and hence given iodoform test while benzophenone does not contain this group and hence does not give iodoform test.. C 6 H 5 COCH 3 (Acetophenone) + 3I 2 + 4 NaOH → CHI 3 + C 6 H 5 COONa (Iodoform) + 3 NaI + 3 H 2 O .

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