Question 1

Aldol condensation will not be observed in&#8230;&#8230;&#8230;.&#10;A)Chloral&#10;B)Phenyl acetaldehyde&#10;C)Hexanal&#10;D)Ethanol

Accepted Answer

Chloral&#10;

Question 2

Which of the following organic compounds exhibits positive Fehling test as well as iodoform test&#8230;&#8230;&#8230;&#8230;.&#10;A)Methanal&#10;B)Ethanol&#10;C)Propanone&#10;D)Ethanal

Accepted Answer

Ethanal (acetaldehyde) gives a positive Fehling test because it is an aldehyde, and it also gives a positive iodoform test due to the presence of a methyl group attached to the carbonyl carbon, which is a requirement for the iodoform reaction.

Question 3

Which of the following will undergo aldol condensation&#8230;&#8230;&#8230;&#10;A)Acetaldehyde&#10;B)Propanaldehyde&#10;C)Benzaldehyde&#10;D)Trideuteroacetaldehyde

Accepted Answer

Acetaldehyde&#10;

Question 4

Acetaldehyde cannot show &#8230;&#8230;&#8230;&#8230;&#8230;.&#10;A)Iodoform test&#10;B)Lucas test&#10;C)Benedict's test&#10;D)Tollen's test

Accepted Answer

Acetaldehyde can show the Iodoform, Benedict's, and Tollen's tests due to its ability to be oxidized and its structure containing a methyl group attached to a carbonyl group. However, it cannot show the Lucas test, which is specific for alcohols, particularly distinguishing between primary, secondary, and tertiary alcohols based on their reactivity with hydrogen chloride and zinc chloride.

Question 5

Benzaldehyde + Sodium hydroxide&#10;A)Benzyl alcohol&#10;B)Benzoic alcohol&#10;C)Hydrobenzamide&#10;D)Cinnamic acid

Accepted Answer

Benzaldehyde reacts with sodium hydroxide in a Cannizzaro reaction to form benzyl alcohol and sodium benzoate.

Question 6

Benzyl alcohol and sodium benzoate is obtained by the action of sodium hydroxide on benzaldehyde. This reaction is known as &#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Perkin's reaction&#10;B)Cannizzaro's reaction&#10;C)Sandmeyer's reaction&#10;D)Claisen condensation

Accepted Answer

The reaction between benzaldehyde and sodium hydroxide that yields benzyl alcohol and sodium benzoate is known as the Cannizzaro's reaction. This reaction involves the disproportionation of an aldehyde without a hydrogen atom in the alpha position into a carboxylic acid and an alcohol.

Question 7

To distinguish between formaldehyde and acetaldehyde, we require&#8230;&#8230;&#8230;.&#10;A)Tollen's reagent&#10;B)Fehling's solution&#10;C)Schiff's reagent&#10;D)Caustic soda solution

Accepted Answer

The answer of To distinguish between formaldehyde and acetaldehyde, we...

Question 8

Which of the following will not give iodoform test?&#10;A)Ethanal&#10;B)Ethanol&#10;C)2-propanone&#10;D)3-pentanon

Accepted Answer

The iodoform test is positive for compounds with at least one methyl group attached to a carbonyl group (C=O) or compounds that can be oxidized to such a structure. Ethanal (A) can be oxidized to acetic acid, which has the necessary methyl group next to a carbonyl. Ethanol (B) can be oxidized to acetaldehyde, which then meets the criteria. 2-propanone (C) already has the necessary methyl group next to a carbonyl. However, 3-pentanone (D) does not have a methyl group adjacent to the carbonyl group and thus will not give a positive iodoform test.

Question 9

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

Accepted Answer

The iodoform test is positive for compounds with a methyl ketone group or ethanol. Acetophenone (a methyl ketone), ethanal (which can oxidize to give a methyl ketone), and ethanol (which directly gives the iodoform test) all react positively. Benzophenone, lacking the necessary methyl group adjacent to the carbonyl, does not give the iodoform test.

Question 10

Haloform test is given by the following substance…………… A)HCHO B)(CH₃)₂ CO C)CH₃OCH₃ D)CH₃CH₂Cl

Accepted Answer

The haloform test is given by methyl ketones, such as acetone ((CH3)2CO), which have the CH3C=O group.

Question 11

Dimethyl ketones are usually characterized through&#8230;&#8230;&#8230;&#8230;.&#10;A)Tollen's reagent&#10;B)Iodoform test&#10;C)Schiff's test&#10;D)Benedict's reagent

Accepted Answer

The answer of Dimethyl ketones are usually characterized through&#8230;&#8230;&#8230;&#8230;.&#10;A)Tollen's reagent&#10;B)Iodoform...

Question 12

If formaldehyde and KOH heated then we gets,&#10;A)Acetylene&#10;B)Methane&#10;C)Methyl alcohol&#10;D)Ethyl formate

Accepted Answer

The answer of If formaldehyde and KOH heated then we...

Question 13

Acetaldehyde reacts with C₂H₅ MgCl the final product is………… A)An aldehyde B)A ketone C)A primary alcohol D)A secondary alcohol

Accepted Answer

The answer of Acetaldehyde reacts with C₂H₅ MgCl the final...

Question 14

Aldol condensation of acetaldehyde involves the formation of which of the following intermediate?&#10;A)Acetate ion&#10;B)A carbanion&#10;C)A carbonium ion&#10;D)A free radical

Accepted Answer

The answer of Aldol condensation of acetaldehyde involves the formation...

Question 15

Aromatic aldehyde undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known as &#8230;&#8230;&#8230;&#8230;..&#10;A)Wurtz's reaction&#10;B)Cannizzaro reaction&#10;C)Friedel-Craft's reaction&#10;D)Claisen reaction

Accepted Answer

The answer of Aromatic aldehyde undergo disproportionation in presence of...

Question 16

Which of the following does not give yellow precipitate with KINaOH&#8230;&#8230;&#8230;&#8230;&#10;A)Acetone&#10;B)Acetaldehyde&#10;C)Benzaldehyde&#10;D)Acetophenone

Accepted Answer

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

Question 17

Which of the following does not turn Schiff's reagent to pink&#8230;&#8230;&#8230;&#8230;&#10;A)Formaldehyde&#10;B)Benzaldehyde&#10;C)Acetone&#10;D)Acetaldehyde

Accepted Answer

The answer of Which of the following does not turn...

Question 18

Fehling's test is positive for&#8230;&#8230;&#8230;.&#10;A)Acetaldehyde&#10;B)Benzaldehyde&#10;C)Ether&#10;D)Alcohol

Accepted Answer

The answer of Fehling's test is positive for&#8230;&#8230;&#8230;.&#10;A)Acetaldehyde&#10;B)Benzaldehyde&#10;C)Ether&#10;D)Alcohol...

Question 19

Acetaldehyde and acetone differ in their reaction with&#8230;&#8230;&#8230;&#8230;..&#10;A)Sodium bisulphite&#10;B)Ammonia&#10;C)Phosphorus pentachloride&#10;D)Phenyl hydrazine

Accepted Answer

The answer of Acetaldehyde and acetone differ in their reaction...

Question 20

The final product formed when acetaldehyde is reduced with sodium and alcohol is&#8230;&#8230;&#8230;&#8230;&#10;A)Ethylene&#10;B)Ethyl alcohol&#10;C)Ethene&#10;D)All of these

Accepted Answer

The answer of The final product formed when acetaldehyde is...

Question 21

The compound obtained by the reduction of propionaldehyde by amalgamated zinc and concentrated HCl is&#8230;&#8230;&#8230;&#8230;&#8230;.&#10;A)Propanol&#10;B)Propane&#10;C)Propene&#10;D)All of these

Accepted Answer

The answer of The compound obtained by the reduction of...

Question 22

Formaldehyde when treated with KOH gives methanol and potassium formate. The reaction is known as&#8230;&#8230;&#8230;..&#10;A)Perkin reaction&#10;B)Claisen reaction&#10;C)Cannizzaro reaction&#10;D)Knoevenagel reaction

Accepted Answer

The answer of Formaldehyde when treated with KOH gives methanol...

Question 23

Acetaldehyde reacts with &#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Electrophiles only&#10;B)Nucleophiles only&#10;C)Free radicals only&#10;D)Both electrophiles and nucleophiles

Accepted Answer

The answer of Acetaldehyde reacts with &#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Electrophiles only&#10;B)Nucleophiles only&#10;C)Free radicals...

Question 24

The typical reactions of aldehyde is&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.&#10;A)Electrophilic addition&#10;B)Nucleophilic substitution&#10;C)Nucleophilic addition&#10;D)Nucleophilic elimination

Accepted Answer

The answer of The typical reactions of aldehyde is&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.&#10;A)Electrophilic addition&#10;B)Nucleophilic...

Question 25

Which will not give acetamide on reaction with ammonia &#8230;&#8230;&#8230;&#8230;&#10;A)Acetic acid&#10;B)Acetyl chloride&#10;C)Acetic anhydride&#10;D)Methyl formate

Accepted Answer

The answer of Which will not give acetamide on reaction...

Deck 10: Aldol Condensation and Fehling Test