NEET Aldehydes Ketones and Carboxylic Acids — Set 19

Question 1

How can ethanal be converted to but-2-enal?

Accepted Answer

Ethanal ($ \ce{CH3CHO} $) undergoes aldol condensation with base, forming 3-hydroxybutanal, which dehydrates to but-2-enal ($ \ce{CH3CH=CHCHO} $).

Question 2

What is the final product when hexan-2-one undergoes Clemmensen reduction?

Accepted Answer

Clemmensen reduction ($ \ce{Zn(Hg), HCl} $) converts hexan-2-one ($ \ce{CH3COCH2CH2CH2CH3} $) to hexane ($ \ce{CH3CH2CH2CH2CH2CH3} $).

Question 3

What is the product when 3-methylbutanal undergoes Cannizzaro reaction?

Accepted Answer

3-Methylbutanal ($ \ce{(CH3)2CHCH2CHO} $) lacks α-hydrogens, so it undergoes Cannizzaro reaction, forming 3-methylbutanol ($ \ce{(CH3)2CHCH2CH2OH} $) and 3-methylbutanoate.

NEET Chemistry: Aldehydes Ketones and Carboxylic Acids — Practice Set 19

Q1. How can ethanal be converted to but-2-enal?

Q2. What is the final product when hexan-2-one undergoes Clemmensen reduction?

Q3. What is the product when 3-methylbutanal undergoes Cannizzaro reaction?

Q4. Which test gives a yellow precipitate with pentan-2-one?

Q5. Which compound forms a violet color with neutral \( \ce{FeCl3} \) when derived from benzoic acid?

Q6. What is the product when methanal reacts with \( \ce{NaOH} \) in the Cannizzaro reaction?

Q7. What is the product when propanone is treated with \( \ce{NaBH4} \)?

Q8. Which compound is formed when acetone reacts with \( \ce{CH3MgBr} \) followed by hydrolysis?

Q9. Which compound yields only methanal upon ozonolysis of its alkene precursor?

Q10. Which carboxylic acid is prepared by oxidation of a primary alcohol?