CBSE Class 12 Chemistry Aldehydes Ketone and Carboxylic Acids Worksheet Set B

Question. If 3-hexanone is reacted with NaBH4 followed by hydrolysis with D₂O, the product will be
(a) CH₃CH₂CH(OH)CH₂CH₂CH₃
(b) CH₃CH₂CD(OH)CH₂CH₂CH₃
(c) CH₃CH₂CH(OD)CH₂CH₂CH₃
(d) CH₃CH₂CD(OD)CH₂CH₂CH₃
Answer : C

Question. Which gives lactic acid on hydrolysis after reacting with HCN ?
(a) HCHO
(b) CH₃CHO
(c) C₆H₅CHO
(d) CH₃COCH₃
Answer : B

Question. The increasing order of the rate of HCN addition to compound A – D is
(A) HCHO (B) CH₃COCH₃
(C) PhCOCH₃ (D) PhCOPh
(a) D < C < B < A
(b) C < D < B < A
(c) A < B < C < D
(d) D < B < C < A
Answer : A

Question. Oxidation of acetaldehyde with selenium dioxide produces
(a) ethanoic acid
(b) methanoic acid
(c) glyoxal
(d) oxalic acid
Answer : C

Question. The reaction of C₆H₅CH = CHCHO with NaBH4 gives
(a) C₆H₅CH₂CH₂CH₂OH
(b) C₆H₅CH = CHCH₂OH
(c) C₆H₅CH₂CH₂CHO
(d) C₆H₅CH₂CHOHCH₃
Answer : A

Question. Consider the following statements :
I. Acetophenone can be prepared by oxidation of 1-phenylethanol
II. Acetophenone can be prepared by reaction of benzaldehyde with methyl magnesium bromide
III. Acetophenone can be prepared by Friedel- Craft’s reaction of benzene with acetyl chloride
IV. Acetophenone can be prepared by distillation of calcium benzoate
Which of the above statements are correct ?
(a) II and III
(b) I and IV
(c) I and III
(d) III and IV
Answer : C

Question. Which of the following on oxidation followed by hydrolysis gives pyruvic acid ?
(a) Acetaldehyde cyanohydrin
(b) Acetone cyanohydrin
(c) Formaldehyde cyanohydrin
(d) None of these
Answer : A

Numeric Value Answer

Question. 1, 2-Diethylbenzene on ozonolysis gives how many different products?
Answer : 3

Question. The amount (in mol) of bromoform (CHBr₃) produced when 1.0 mole of acetone reacts completely with 9.0 mole of bromine in the presence of aqueous NaOH is
Answer : 11

Question. How many products are formed when ethanal reacts with propanal in the presence of a base?
Answer : 4

 CBSE Class 12 Chemistry Aldehydes Ketone and Carboxylic Acids Worksheet Set B

             Very Short Answer

Q1)       Define cross aldol condensation?

Q2)       What are the uses of aldol reaction?

Q3)       What is ethylene glycol ketals?

Q4)       What are fatty acids?

Q5)       What are the uses of aldehydes?

              Short Answer

Q6)       What do you understand by Tollens’ test?

Q7)       What is aldol condensation?

Q8)       What do you mean by Fehling’s test?

Q9)       What are the effects of substituents on the acidity of carboxylic acids?

Q10)     What are the uses of carboxylic acid?

              Long Answer

Q11)     Explain the physical properties of carboxyl acids?

Q12)     State the difference between carboxyl group and carbonyl group?

Q13)     Explain the preparation of carboxylic acids?

Q14)     State the difference between aldol condensation and Cannizzaro reduction?

Q15)     State the difference between benzaldehyde and acetaldehyde?

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