CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids Question Bank Set C

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Unit 12 Aldehydes, Ketones and Carboxylic Acids Chemistry Worksheet for Class 12

Class 12 Chemistry students should refer to the following printable worksheet in Pdf in Class 12. This test paper with questions and solutions for Class 12 Chemistry will be very useful for tests and exams and help you to score better marks

Class 12 Chemistry Unit 12 Aldehydes, Ketones and Carboxylic Acids Worksheet Pdf

ALDEHYDES, KETONES AND CARBOXYLIC ACIDS
 
1 Assertion and reasoning:
 
In the following questions a statement of assertion followed by a statement of reason is given.
 
Choose the correct answer out of the following choices.
 
(i) Assertion and reason both are correct and reason is correct explanation of assertion.
(ii) Assertion is correct statement but reason is wrong statement.
(iii) Assertion is wrong statement but reason is correct statement.
(iv) Assertion and reason both are correct statements but reason is not correct explanation of assertion.
 
Q1) Assertion: Alpha hydrogen atoms of aldehydes and ketones are acidic
       Reason: Aldehydes and ketones with alpha hydrogen undergo aldol condensation
 
Q2) Assertion: Benzaldehydes and formaldehyde undergo Cannizzaro reaction.
       Reason: Both are equally reactive
 
2 Write short notes on the following:
 
a. Clemmensen reduction b. Aldol Condensation c. Rosenmund reduction
d. Hell-Volhard-Zelinsky reaction
e. Cannizzaro reaction
f. Cross Aldol Condensation reaction
 
3 Give the structure of the following:
 
a. Hex-2-en-4-ynoic acid b. 3-hydroxy butanal
c. p-Nitropropiophenone d. 3-Bromo-4-phenylpentanoic acid
e. 3-Methylcyclohexane carbaldehyde
 
4 Explain the following mechanisms:
 
a) Nucleophilic attack on a carbonyl group of an aldehyde or a ketone.
b) Nucleophilic addition of Grignard reagent on a carbonyl group of an aldehydeor a ketone.
 
5 Distinguish the following:
 
a) Formic acid and Acetic acid           b) Phenol and benzoic acid
c) Benzaldehyde and Acetaldehyde    d) Benzaldehyde and acetophenone
 
6 Arrange the following in the increasing order of the property given as indicated:
 
a) Acetaldehyde, acetone, Di-ter-butylketone, methyl-ter-butylketone (Reactivity towards HCN)
b) 2-Bromobutanoic acid, 3-bromobutanoic acid, 2-methylpropanoic acid, butanoic acid (Acid strength)
c) CH3CHO, CH3CH2OH, CH3OCH3, CH3CH2CH3 (Boiling point)
d) Ethanal, Propanal, Propanone, Butanone (Nucleophilic addition)
e) Benzoic acid , 4- nitrobenzoic acid , 3,4- dinitrobenzoic acid , 4- methoxybenzoic acid (acid strength)
 
7 Effect the following conversions:
 
a. Propanone to propene b. Propanal to Butan-2-one
c. Ethanol to 3-hydroxy butanal
e.Styrene to benzoic acid
d. Benzaldehyde to 2-hydroxyphenyl aceticacid.
 
8 Account for the following:
a) Carboxylic acids do not give reactions of carbonyl group.
b) Aldehydes are more reactive to nucleophilic addition than ketones.
c) Carboxylic acids have higher boiling points than aldehyde, ketones and even alcohols
of comparable molecular mass.
d) Chloroacetic acid is stronger than acetic acid.
e) There is two –NH2 groups in semicarbazide , however only one is involved in the formation of semicarbazone.
 
9 a) An organic compound A contains 69.77% carbon, 11.63% hydrogen and rest oxygen. The molecular mass of the compound is 86. It does not reduce Tollens’ reagent but forms an addition compound with sodium hydrogen sulphite and give positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Write the possible structure of the compound A.
 
b) Write the chemical tests to distinguish between the following pairs of compounds:
i. Acetophenone and Benzophenone
ii. Ethanal and Propanal
 
Multiple choice questions:
 
1 Catalytic hydration of propyne gives
(a) Propanol   (b) Propanone   (c) Propene   (d) Propanal
 
2 Benzene is converted into benzaldehyde in the reaction
(a) Cannizzaro reaction (b) Etard reaction   (c) Gatterman –Koch reaction
(d) Rosenmund reaction
 
3 The most acidic in the following
(a) CH3COOH   (b) CF3COOH   (c) CCl3COOH  (d) CBr3COOH
 
4 Which compound forms silver mirror with Tollen’s reagent
(a) Alcohol   (b) Aldehyde   (c) Ketone   (d) Acid
 
5 The product of Wolff-Kishner reduction is
(a) Aldehyde   (b) Ketone   (c) Alkane   (d) Alcohol


Please click on below link to download CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids Question Bank Set C

Unit 12 Aldehydes, Ketones and Carboxylic Acids CBSE Class 12 Chemistry Worksheet

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