NEET Aldehydes Ketones and Carboxylic Acids — Set 16

Question 1

Which reagent converts butanoic acid to butanal in two steps?

Accepted Answer

Step 1: $ \ce{LiAlH4} $ reduces butanoic acid ($ \ce{CH3CH2CH2COOH} $) to butan-1-ol ($ \ce{CH3CH2CH2CH2OH} $). Step 2: PCC oxidizes it to butanal ($ \ce{CH3CH2CH2CHO} $).

Question 2

What is the product of the Wolff-Kishner reduction of benzophenone?

Accepted Answer

Wolff-Kishner reduction ($ \ce{NH2NH2, KOH} $) converts ketones to hydrocarbons. Benzophenone ($ \ce{C6H5COC6H5} $) yields diphenylmethane ($ \ce{C6H5CH2C6H5} $).

Question 3

Which of the following is a product of the oxidation of pentan-1-ol with $ \ce{K2Cr2O7/H2SO4} $?

Accepted Answer

Strong oxidation of a primary alcohol like pentan-1-ol ($ \ce{CH3CH2CH2CH2CH2OH} $) with $ \ce{K2Cr2O7/H2SO4} $ yields pentanoic acid ($ \ce{CH3CH2CH2CH2COOH} $).

NEET Chemistry: Aldehydes Ketones and Carboxylic Acids — Practice Set 16

Q1. Which reagent converts butanoic acid to butanal in two steps?

Q2. What is the product of the Wolff-Kishner reduction of benzophenone?

Q3. Which of the following is a product of the oxidation of pentan-1-ol with \( \ce{K2Cr2O7/H2SO4} \)?

Q4. Arrange in decreasing order of acidity: \( \ce{CH3COOH} \), \( \ce{C6H5COOH} \), \( \ce{CH3CH2COOH} \).

Q5. Which alkene produces pentan-2-one and methanal upon ozonolysis?

Q6. Which pair of compounds can be distinguished by Tollens' test but not by Schiff’s test?

Q7. Which compound gives a positive Schiff’s test and forms a primary alcohol in the Cannizzaro reaction?

Q8. Which compound does not give a positive Fehling’s test?

Q9. What is the product when butanal reacts with \( \ce{HCN} \)?

Q10. What is the IUPAC name of \( \ce{CH3CH2CH2COCH2CH3} \)?