Chemistry QuestionsAldehydes; Ketones And Carboxylic Acids Questions for CBSE Class 12th

Aldehydes; Ketones And Carboxylic Acids Questions for CBSE Class 12th

Final product of the below reaction is

Observe the following reaction & choose the correct option/s :

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    In how many reactions 3º alcohol will be major product ?

    The above compounds cannot be distinguished by which of the following reagent(s):

    Match the reactions from Colum I with the properties of products from Column II. Mark the correct option form the codes given below.

    The correct order of ease of deprotonation of labelled H-atoms is:

    COLUMN – I Reaction COLUMN – II Product a. ( COOH ) 2 ⋅ 2 H 2 O Δ 105 ∘ C (I) p. 2 CO 2 + H 2 O b. (I) Δ at 200 ∘ C or H 2 SO 4 , at 90 ∘ C q. ( COOH ) 2 c. r. CO + CO 2 + H 2 O d. (I) Δ KMnO 4 s. Carbon suboxide ( O = C = C = C = O ) e. 2 HCOONa Δ , 360 ∘ C H 3 O ⊕ t. MeCOOH + CO 2 f.

    Which compound will be most reactive in nucleophilic addition?

    Consider the following reaction scheme. The number of carbon atoms in the ketone is

    Match the following Column-1 Column-2 A. Ethanal 1. Mesitylene on reaction with conc.sulphuric acid. B. Acetophenone 2.Used to prepare Nylon-6 fibres. C. Acetone 3.Crotonaldehyde on heating with Dil.NaOH D. Cyclohexanone 4.Crotonic acid on reaction with KOH 5.Gives sodium Benzoate and yellow ppt with base and Iodine solution

    Sum of double bond equivalent in A,B,C is x then x – 8 = ?

    X= number of aldol condensation product (including stereoisomer). Find out the value of (X).

    Methylation of chiral ketone I as shown below affords a mixture of two dimethyl ketone products II and III. Which of the following is (are) true ?

    where A and B are respectively.

    Identify correct statement for (A) and (B) products.

    An organic compound on reaction with 2,4-dinitrophenylhydrazine (2,4-DNP) gives a yellow precipitate. It also gives silver mirror on reaction with ammonical AgNO3. It gives an alcohol and sodium salt of a carboxylic acid on reaction with concentrated NaOH. It yields benzene-1,2-dicarboxylic acid on heating with alkaline KMnO4. The structure of the compound among the following is

    An aromatic compound X with molecular formula, C 9 H 10 O gives the following chemical tests. i) Forms 2,4-DNP derivative ii) Reduces Tollen’s reagent. iii) Undergoes Cannizaro reaction iv) On vigorous oxidation 1,2-benzene decarboxylic acid is obtained . X is.

    See the following reaction sequence. Correct statement regarding A

    Which of the following reaction(s) can produce as one of the product on prolonged treatment with given reagents.

    The final product (B) in the following sequence of reaction, would be

    Identify the correct option with respect to structure of the product

    Identify the product(s) formed during the following reaction

    Which of the following statement(s) is/are correct about (X)?

    Which of the following compound(s) forms stable hydrates?

    Which of the following is (are) possible combination(s) to prepare 1-phenyl-1,3-butadiene by Wittig reaction?

    In the following reactions

    An organic acid P (C 11 H 12 O 2 ) can easily be oxidized to a dibasicacid which reacts with ethyleneglycol to produce a polymer dacron. Upon ozonolysis, P gives an aliphatic ketone as one of the products. P undergoes the following reaction sequences to furnish R via Q . The compound P also undergoes another set of reactions to produce S .

    Treatment of compound O with K M n O 4 / H + gave P, which on heating with ammonia gave Q. The compound Q on treatment with B r 2 / N a O H produced R. On strong heating, Q gave S, which on further treatment with ethyl 2-bromopropanoate in the presence of KOH followed by acidification, gave a compound T.

    A and B are two structural isomers with their molecular formula C 7 H 14 O and both gives-off effervescence on heating with Na-metal. However, neither A nor B decolourise brown colour of B r 2 − H 2 O . Treating either A or B with hot conc. sulphuric acid solution results in the formation of the same compound C   ( C 7 H 12 ) . C on treatment with O 3 followed by Z n − H 2 O gives D   ( C 7 H 12 O 2 ) . D gives E ( C 7 H 16 O 2 ) on treatment with N a B H 4 . E has only one methyl group and forms yellow ppt. with I 2 / K O H . Also, A gives delayed turbidity on treatment with conc. H C l / Z n C l 2 while B gives immediate turbidity on similar treatment.

    Consider the following scheme of reactions: A C 6 H 12 HCl B + C C 6 H 13 Cl B alc. KOH D    ( isomer of A ) D Ozonolysis E    ( it gives negative test with Fehling solution but responds to iodoform test ) A Ozonolysis F + G    ( both give positive Tollen’s test but do not give iodoform test ) F + G conc. NaOH H C O O N a + a primary alcohol

    In the reaction scheme shown below Q, R and S are the major products. The correct structure of

    In the following reaction, compound Q is obtained from compound P via an ionic intermediate What is the degree of unsaturation of Q ?

    Which is/are correctly matched with R and to have acetone as the sole organic product.

    An organic compound C 10 H 10 O A which do not decolorize bromine water, reacts with MeMgBr to form an alcohol C 11 H 14 O B which on dehydration gave C 11 H 12 C . Compound(C) on ozonolysis gave a compound C 10 H 12 O 2 D which on oxidation with Ag NH 3 2 + gave C 11 H 12 O 3 E E on decarboxylation gave C 10 H 12 O F is one of the isomers formed by Friedel Craft acetylation of ethyl benzene

    Nucleophillic addition reaction can be represented as:

    Three isomeric compounds (C 8 H 8 O) X, Y and Z give the following laboratory tests. Isomers FeCl 3 [Ag(NH 3 ) 2 ] + Na metal X Coloured solution Negative Effervescence Y Negative Precipitate Negative Z Negative Negative Negative

    Observe the following reaction Choose the correct options

    Observe the following reaction Number of –COOH functional groups are present in major product

    Acetaldehyde and acetone is subjected to treatment with base, How many possible unsaturated products are obtained?

    Two aliphatic aldehydes P and Q react in the presence of aqueous K 2 CO 3 to give compound R, which upon treatment with HCN provides compound S. On acidification and heating, S gives the product shown below:

    Column I(Reaction) Column II (Product) (A) Beckman rearrangement (P) α , β -unsaturated carbonyl (B) Perkin’s condensation (Q) N-Alkylamide (C) Aldol condensation (R) α , β -unsaturated acid (D) Claisen condensation (S) β -ketoester

    Nucleophillic addition reaction can be represented as: Correct decreasing order of hydrate formation amongst the following compound is/are……….

    Nucleophillic addition reaction can be represented as: Product S is:

    C 6 H 5 − CH = CHCHO ⟶ ( X ) C 6 H 5 CH = CHCH 2 OH In the above sequence (X) can be:

    The reaction sequence(s) that would lead to o-xylene as the major product is(are)

    Consider the reaction sequence in the following synthesis The end product (s) is/are

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