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Which of the following cannot convert carboxylic acid into its acyl chloride?

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Important Questions on Aldehydes, Ketones and Carboxylic Acids

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JEE Main
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Chemistry Crash Course JEE Main>Chapter 2 - Aldehydes, Ketones and Carboxylic Acids>Level 1>Q 78
On strong heating, ammonium acetate gives
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JEE Main
IMPORTANT
Chemistry Crash Course JEE Main>Chapter 2 - Aldehydes, Ketones and Carboxylic Acids>Level 1>Q 79
Acetyl chloride cannot be obtained by treating acetic acid with:
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Chemistry Crash Course JEE Main>Chapter 2 - Aldehydes, Ketones and Carboxylic Acids>Level 1>Q 80
Among the following acids, the strongest one is:
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Chemistry Crash Course JEE Main>Chapter 2 - Aldehydes, Ketones and Carboxylic Acids>Level 1>Q 81
Ethyl isocyanide on hydrolysis in an acidic medium generates
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Chemistry Crash Course JEE Main>Chapter 2 - Aldehydes, Ketones and Carboxylic Acids>Level 1>Q 82

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Select best reagent to carry out above conversion.

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Chemistry Crash Course JEE Main>Chapter 2 - Aldehydes, Ketones and Carboxylic Acids>Level 1>Q 83

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Chemistry Crash Course JEE Main>Chapter 2 - Aldehydes, Ketones and Carboxylic Acids>Level 1>Q 84
2DCDO →OH− X and Y are
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Chemistry Crash Course JEE Main>Chapter 2 - Aldehydes, Ketones and Carboxylic Acids>Level 1>Q 85
A compound C5H10O gives a positive test of carbonyl group, a negative test with Fehling solution, a positive haloform test and on reduction it gives normal pentane. Identify the compound.