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Chapter 5: Problem 149

Identify the incorrect statement among the following. (a) Both pyruvic acid and lactic acid answer the haloform test (b) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}\) can be reduced to \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}\) using red \(\mathrm{P}\) and \(\mathrm{HI}\) (c) Kolbe's electrolysis of potassium succinate gives ethylene and \(\mathrm{CO}_{2}\) (d) Strong heating of ammonium acetate gives methylcyanide

Short Answer

Expert verified
a) Both pyruvic acid and lactic acid answer the haloform test. b) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}\) can be reduced to \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}\) using red \(\mathrm{P}\) and \(\mathrm{HI}\). c) Kolbe's electrolysis of potassium succinate gives ethylene and \(\mathrm{CO}_{2}\). d) Strong heating of ammonium acetate gives methylcyanide. Answer: a) Both pyruvic acid and lactic acid answer the haloform test.

Step by step solution

01

Statement A

Haloform test is generally given by compounds containing a \(\ce{C-CH3-CO-}\) group, such as methyl ketones. Neither pyruvic acid nor lactic acid contains this group. So, this statement is incorrect.
02

Statement B

Ethanoic acid (\(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}\)) can be reduced to ethane (\(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}\)) using red phosphorus and hydrogen iodide. This reaction is a reduction process where the carboxyl group is replaced with a hydrogen atom which results in a complete reduction of the ethanoic acid to ethane. So, this statement is correct.
03

Statement C

Kolbe's electrolysis is a process where a carboxylate salt undergoes electrolysis to form a radical, which further decomposes to give alkane radicals, alkene, and carbon dioxide. Potassium succinate, when subjected to Kolbe's electrolysis, would give ethylene (\(\ce{C2H4}\)) and carbon dioxide (\(\ce{CO2}\)) as products. So, this statement is correct.
04

Statement D

When ammonium acetate is subjected to strong heating, it undergoes thermal decomposition to produce methylcyanide (\(\ce{CH3CN}\)) as the major product. This reaction proceeds via the formation of an amide as an intermediate. So, this statement is correct. Based on the above analysis, the incorrect statement is (a) Both pyruvic acid and lactic acid answer the haloform test.

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Most popular questions from this chapter

The acylating species in the Friedel-Crafts acylation of benzene to give acetophenone is (a) \(\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{O}^{\odot}\) (b) \(\mathrm{AlCl}_{4}\) (c) \(\mathrm{CH}_{3}-\stackrel{\oplus}{\mathrm{C}}=\ddot{\mathrm{O}}\) (d) \(\mathrm{CH}_{3}^{-\mathrm{C} \mathrm{C} \mathrm{Cl}}-\mathrm{O}-\mathrm{AlCl}\)

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