Aldehydes, Ketones and Carboxylic Acids — Class 12 Chemistry PYQs

Which of the following is the strongest acid ?
(A) p-Cl – C₆H₄COOH
(B) p-OH – C₆H₄COOH
(C) C₆H₅COOH
(D) p-NO₂ – C₆H₄COOH

The product formed as a result of reaction of CH₃MgBr and CO₂ followed by hydrolysis is :
(A) CH₃CHO
(B) CH₃COCH₃
(C) HCOOH
(D) CH₃COOH

Acetic acid reacts with PCl₅ to give :
(A) Cl – CH₂ – COCl
(B) Cl – CH₂ – COOH
(C) CH₃ – COCl
(D) CCl₃ – COOH

Decarboxylation of sodium benzoate on heating with soda lime gives :
(A) benzene
(B) benzoic acid
(C) benzaldehyde
(D) toluene

The formation of cyanohydrin from an aldehyde is an example of :
(A) nucleophilic addition
(B) electrophilic addition
(C) nucleophilic substitution
(D) electrophilic substitution

The product (X) obtained in the following reaction is :

[Cyclohexanecarbaldehyde] $\stackrel{\text{[Ag(NH₃)₂]⁺OH⁻}}{\to }$ (X)

(A) [Cyclohexyl methanol]
(B) [Cyclohexyl carboxylic acid]
(C) [Cyclohexanone]
(D) [Cyclohexyl carboxylate ion]

The IUPAC name of CH₃–C(=O)–CH₂–CHO is :

(A) 1-oxobutanal-3-one
(B) 1-oxobutanal
(C) 3-oxobutanal
(D) 3-oxobutanone

Which of the following has the highest boiling point ?
(A) CH₃CHO
(B) CH₃COCl
(C) CH₃COCH₃
(D) CH₃COOH

Assertion (A) : Fluoroacetic acid is stronger acid than chloroacetic acid.
Reason (R) : This is due to greater electron withdrawing nature of F than Cl.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(C) Assertion (A) is true, but Reason (R) is false.
(D) Assertion (A) is false, but Reason (R) is true.

Assertion (A) : The pKa of O₂N – CH₂ – COOH is lower than that of CH₃ – COOH.
Reason (R) : – NO₂ group shows electron withdrawing effect which increases the acidic character of O₂N – CH₂ – COOH.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(C) Assertion (A) is true, but Reason (R) is false.
(D) Assertion (A) is false, but Reason (R) is true.