Question 1

The addition of HCN to carbonyl compounds is an example of &#8230;&#8230;&#8230;.&#10;A)Nucleophilic substitution&#10;B)Electrophilic addition&#10;C)Nucleophilic addition&#10;D)Electrophilic substitution

Accepted Answer

The addition of HCN to carbonyl compounds is an example of nucleophilic addition, where the nucleophile (CN-) attacks the electrophilic carbon atom of the carbonyl group, leading to the formation of a cyanohydrin.

Question 2

Which of the following reagents is used to distinguish acetone and Acetophenone? A)NaHSO₃ B)Grignard reagent C)Na₂SO₄ D)NHCl₄

Accepted Answer

Sodium bisulfite (NaHSO₃) reacts with acetone to form a bisulfite addition compound, but it does not react with acetophenone, allowing for differentiation between the two.

Question 3

The product formed by the reaction of chlorine with benzaldehyde in the absence of a catalyst is&#8230;&#8230;&#8230;&#8230;..&#10;A)Chlorobenzene&#10;B)Benzyl chloride&#10;C)Benzoyl Chloride&#10;D)o -Chlorobenzaldehyde

Accepted Answer

Benzaldehyde reacts with chlorine in the absence of a catalyst to form benzoyl chloride. This reaction is a part of the halogenation of aldehydes under substitution conditions, where the chlorine replaces the aldehyde's hydrogen in the formyl group, leading to the formation of an acyl chloride.

Question 4

Enol content is highest in&#8230;&#8230;&#8230;&#8230;..&#10;A)Acetone&#10;B)Acetophenone&#10;C)Acetic acid&#10;D)Acetyl acetone

Accepted Answer

Acetyl acetone has the highest enol content due to the presence of two keto groups which stabilize the enol form through intramolecular hydrogen bonding, making the enol form more favorable.

Question 5

Which one of the following reacts with HCN and Tollen's reagent, but is not oxidised by Fehling's solution&#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Methanal&#10;B)Ethanal&#10;C)Benzaldehyde&#10;D)Acetone

Accepted Answer

Benzaldehyde reacts with HCN to form cyanohydrins and with Tollen's reagent to give a silver mirror, but it is not oxidized by Fehling's solution because it lacks the necessary hydroxyl group adjacent to the carbonyl group that is required for oxidation by Fehling's solution.

Question 6

During reaction of benzaldehyde with alkali one of the product is&#8230;&#8230;&#8230;&#8230;&#10;A)Phenol&#10;B)Benzyl alcohol&#10;C)Benzene&#10;D)Benzophenone

Accepted Answer

The reaction of benzaldehyde with alkali (such as sodium hydroxide) typically involves a Cannizzaro reaction, where benzaldehyde is disproportionated into benzyl alcohol and benzoic acid. Benzyl alcohol is one of the products formed.

Question 7

Cannizzaro reaction is given by………… A)HCHO B)CH₃COCH₃CH C)CH₃CHO D)CH₃CH₂OH

Accepted Answer

The Cannizzaro reaction is a redox reaction that occurs with aldehydes that do not have an alpha hydrogen. Formaldehyde (HCHO) is the only option without an alpha hydrogen, making it suitable for the Cannizzaro reaction.

Question 8

When two molecules of acetaldehyde condense in the presence of dilute alkali, it forms&#8230;&#8230;&#8230;&#8230;.&#10;A)Acetal&#10;B)Sodium formate&#10;C)Aldol&#10;D)Methylene

Accepted Answer

When two molecules of acetaldehyde condense in the presence of dilute alkali, they undergo an aldol condensation to form an aldol. This reaction involves the formation of a β-hydroxy aldehyde.

Question 9

Acetaldehyde and acetone can be distinguished by&#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Molisch test&#10;B)Bromoform test&#10;C)Solubility in water&#10;D)Tollen's test

Accepted Answer

Tollen's test can distinguish between acetaldehyde and acetone because acetaldehyde is an aldehyde and will give a positive result (silver mirror), while acetone, a ketone, will not react.

Question 10

Aldehyde turns pink with &#8230;&#8230;&#8230;&#8230;.&#10;A)Benedict solution&#10;B)Schiff reagent&#10;C)Fehling solution&#10;D)Tollen's reagent

Accepted Answer

Schiff reagent is specifically designed to react with aldehydes, causing a color change to pink, indicating the presence of an aldehyde group.

Question 11

Boiling point of acetone is&#8230;&#8230;&#8230;&#8230;..&#10;A)56&#176;C&#10;B)60&#176;C&#10;C)100&#176; C&#10;D)90&#176;C

Accepted Answer

The answer of Boiling point of acetone is&#8230;&#8230;&#8230;&#8230;..&#10;A)56&#176;C&#10;B)60&#176;C&#10;C)100&#176; C&#10;D)90&#176;C...

Question 12

The reagent with which both aldehyde and acetone react easily is&#8230;&#8230;&#8230;&#8230;&#8230;.&#10;A)Fehling's reagent&#10;B)Grignard reagent&#10;C)Schiff's reagent&#10;D)Tollen's reagent

Accepted Answer

The answer of The reagent with which both aldehyde and...

Question 13

Acetal is obtained by reacting in the presence of dry HCl and alcohol with&#8230;&#8230;&#8230;&#8230;..&#10;A)Aldehyde&#10;B)Ketone&#10;C)Ether&#10;D)Carboxylic acid

Accepted Answer

The answer of Acetal is obtained by reacting in the...

Question 14

Which of the following is used to detect aldehydes&#8230;&#8230;&#8230;&#8230;..&#10;A)Million's test&#10;B)Tollen's reagent&#10;C)Neutral ferric chloride solution&#10;D)Molisch's test

Accepted Answer

The answer of Which of the following is used to...

Question 15

Which of the following aldehydes give red precipitate with Fehling solution ?&#10;A)Benzaldehyde&#10;B)Salicylaldehyde&#10;C)Acetaldehyde&#10;D)None of these

Accepted Answer

The answer of Which of the following aldehydes give red...

Question 16

Acetaldehyde and Acetone can be distinguished by&#8230;&#8230;&#8230;..&#10;A)Iododorm test&#10;B)Nitroprusside test&#10;C)Fehling's solution test&#10;D)DNP test

Accepted Answer

The answer of Acetaldehyde and Acetone can be distinguished by&#8230;&#8230;&#8230;..&#10;A)Iododorm...

Question 17

Which of the following will fail to react with potassium dichromate and dilute sulphuric acid&#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Ethyl alcohol (ethanol)&#10;B)Acetaldehyde (ethanal)&#10;C)Secondary propyl alcohol (2-propanol)&#10;D)Acetone (propanone)

Accepted Answer

The answer of Which of the following will fail to...

Question 18

The key step in cannizzaro's reaction is the intermolecular shift of &#8230;&#8230;&#8230;.&#10;A)Proton&#10;B)Hydride ion&#10;C)Hydronium ion&#10;D)Hydrogen bond

Accepted Answer

The answer of The key step in cannizzaro's reaction is...

Question 19

A compound, containing only carbon, hydrogen and oxygen, has a molecular weight of 44. On complete oxidation it is converted into a compound of molecular weight 60. The original compound is ?&#10;A)An aldehyde&#10;B)An acid&#10;C)An alcohol&#10;D)an ether

Accepted Answer

The answer of A compound, containing only carbon, hydrogen and...

Question 20

Which of the following has the most acidic hydrogen?&#10;A)3-hexanone&#10;B)2, 4-hexanedione&#10;C)2, 5-hexanedione&#10;D)2, 3-hexanedione

Accepted Answer

The answer of Which of the following has the most...

Question 21

Which of the following statements regarding chemical properties of acetophenone are wrong……
(1) It is reduced to methyl phenyl carbinol by sodium and ethanol
(2) It is oxidised to benzoic acid with acidified KMnO₄
(3) It does not undergo iodoform electrophilic substitution like nitration at meta position
(4) It does not undergo iodoform reaction with iodine and alkali

A)1 and 2
B)2 and 4
C)3 and 4
D)1 and 3

Accepted Answer

The answer of Which of the following statements regarding chemical...

Question 22

Which of the following will not give iodoform test ?&#10;A)Isopropyl alcohol&#10;B)Ethanol&#10;C)Ethanal&#10;D)Benzyl alcohol

Accepted Answer

The answer of Which of the following will not give...

Question 23

What is color is Chloral hydrate?&#10;A)Yellow&#10;B)White&#10;C)Colourless&#10;D)None

Accepted Answer

The answer of What is color is Chloral hydrate?&#10;A)Yellow&#10;B)White&#10;C)Colourless&#10;D)None...

Question 24

Aldol condensation is dose not ocurre between&#8230;&#8230;&#8230;..&#10;A)Two different ketone&#10;B)Two different aldehyde&#10;C)An ketone and aldehyde&#10;D)An aldehyde and ester

Accepted Answer

The answer of Aldol condensation is dose not ocurre between&#8230;&#8230;&#8230;..&#10;A)Two...

Question 25

In which of the following reaction new carbon carbon bond is not formed?&#10;A)Cannizzaro reaction&#10;B)Friedel craft reaction&#10;C)Wurtz reaction&#10;D)Aldol condensation

Accepted Answer

The answer of In which of the following reaction new...

Deck 11: Carboxylic Acids Properties