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Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids MCQs | Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids Objective Type Questions and Answers

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Free download in PDF Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) Which one of the following on oxidation gives a ketone?
[A] primary alcohol
[B] secondary alcohol
[C] tertiary alcohol
[D] All of these
Answer: secondary alcohol
(2) Consider the following transformations
CH3COOHThe molecular formula of C is
[A]
[B] ICH2-COCH3
[C] CHI3
[D] CH3I
Answer: ICH2-COCH3
(3) A and B in the following reactions are
[A]
[B]
[C]
[D]
Answer:
(4) The product formed in aldol condensation is
[A] a beta-hydroxy acid
[B] a beta-hydroxy aldehyde or a beta-hydroxy ketone
[C] an alpha-hydroxy aldehyde or ketone
[D] an alpha, beta unsaturated ester
Answer: a beta-hydroxy aldehyde or a beta-hydroxy ketone
(5) Consider the following reaction,

The product Z is
[A] toluene
[B] benzaldehyde
[C] benzoic acid
[D] benzene
Answer: benzoic acid
(6) Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called
[A] Clemmenson reduction
[B] Cope reduction
[C] Dow reduction
[D] Wolff-Kishner reduction
Answer: Clemmenson reduction
(7) Aldol condensation will not take place in
[A] HCHO
[B] CH3CHO
[C] CH3COCH3
[D] CH3CH2CHO
Answer: HCHO
(8)
In the above reaction product, 'P' is
[A]
[B]
[C]
[D]
Answer:
(9) The -OH group of an alcohol or the -COOH group of a carboxylic acid can be replaced by -Cl using
[A] phosphorus pentachloride
[B] hypochlorous acid
[C] chlorine
[D] hydrochloric acid
Answer: phosphorus pentachloride
(10) An ester is boiled with KOH. The product is cooled and acidified with conc. HCl. A white crystalline acid separates. The ester is
[A] methyl acetate
[B] ethyl acetate
[C] ethyl formate
[D] ethyl benzoate
Answer: ethyl benzoate
(11) The compound formed when malonic acid heated with urea, is
[A] cinnamic acid
[B] butyric acid
[C] barbituric acid
[D] crotonic acid
Answer: barbituric acid
(12) What is formed when a primary alcohol undergoes catalytic dehydrogenation?
[A] Aldehyde
[B] Ketone
[C] Alkene
[D] Acid
Answer: Aldehyde
(13) The compound which on reduction with LiAlH4 gives two diffrent alcohols:
[A] CH3COOCH3
[B] CH3COOC2H5
[C] CH3COCH3
[D] CH3CHO
Answer: CH3COOCH3
(14) HCHO and HCOOH are distinguished by treating with:
[A] Tollens reagent
[B] NaHCO3
[C] Fehling's Solution
[D] Benedict Solution
Answer: NaHCO3
(15) Lacrymator or tear gas is:

[A] C6H5COCl
[B] C6H5OC6H5
[C] C6H5COCH2Cl
[D] C6H5COCH3
Answer: C6H5COCH2Cl
(16) Formaldehyde can be distinguished from acetaldehyde by:
[A] Fehling's solution
[B] Schiff's reagent
[C] Ammonia
[D] Ammoniacal AgNO3
Answer: Ammonia
(17) The correct acidity order of the following is:
[A] (III)>(IV)>(II)>(I)
[B] (IV)>(III)>(I)>(II)
[C] (III)>(II)>(I)>(IV)
[D] (II)>(III)>(IV)>(I)
Answer: (III)>(IV)>(II)>(I)
(18) Acetone reacts with iodine (I2) to form iodoform in the presence of
[A] CaCO3
[B] NaOH
[C] KOH
[D] MgCO3
Answer: NaOH
(19) Genrally Aldehydes behave as:
[A] oxidising agent
[B] reducing agent
[C] dehydration agent
[D] oxidizing as well as reducing agent
Answer: reducing agent
(20) Compound (A) C5H10O forms a phenyl hydrazone and gives negative Tollen's and iodoform tests. Compound (A) on reduction gives n-pentane. Compound (A) is:
[A] a primary alcohol
[B] an aldehyde
[C] a ketone
[D] a secondary alcohol
Answer: a ketone

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