Preparation and Properties of Aldehydes and Ketones
Chemistry ⇒ Carbon and Organic Chemistry
Preparation and Properties of Aldehydes and Ketones starts at 12 and continues till grade 12.
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A student adds 2,4-DNP to an unknown compound and observes a yellow precipitate. What does this indicate about the functional group present?
Aldehydes are generally more reactive than ketones towards nucleophilic addition reactions. State one reason for this difference.
Describe the difference in the chemical reactivity of aldehydes and ketones towards oxidation.
Describe the mechanism of nucleophilic addition of HCN to an aldehyde.
Describe the process of ozonolysis of alkenes for the preparation of aldehydes and ketones.
Describe the role of acid or base in the aldol condensation of aldehydes and ketones.
A student adds 2,4-DNP to an unknown compound and observes a yellow precipitate. What does this indicate about the functional group present?
A compound with molecular formula C4H8O does not react with Tollens' reagent but gives a positive Iodoform test. Identify the compound and explain your reasoning.
Which of the following compounds will give a positive Tollens' test?
(1) Propanone
(2) Benzaldehyde
(3) 2-Butanone
(4) Acetone
Which of the following is a method for the preparation of aromatic aldehydes?
(1) Gattermann-Koch reaction
(2) Wurtz reaction
(3) Friedel-Crafts alkylation
(4) Kolbe-Schmitt reaction
Which of the following is a product of the Clemmensen reduction of a ketone?
(1) Alcohol
(2) Alkane
(3) Carboxylic acid
(4) Ester
Which of the following is a property of formaldehyde?
(1) It is a gas at room temperature
(2) It is a colorless liquid with a pungent odor
(3) It is insoluble in water
(4) It is a solid at room temperature
Fill in the blank: The reaction of a ketone with a Grignard reagent followed by hydrolysis gives a ________.
Fill in the blank: The reaction of an aldehyde with ammonia produces a ________.
Fill in the blank: The reaction of an aldehyde with an alcohol in the presence of acid produces a ________.
Fill in the blank: The reaction of an aldehyde with hydrogen cyanide (HCN) produces a ________.
True or False: All aldehydes and ketones are soluble in water.
True or False: Both aldehydes and ketones can reduce Fehling's solution.
True or False: Ketones can be prepared by the oxidation of secondary alcohols.
True or False: The Cannizzaro reaction occurs only with aldehydes that lack alpha-hydrogen atoms.
