Organic Chemistry - Aldehydes & Ketones

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Q1. Which of the following statements is true regarding aldehydes? (2023)

Solution:

Aldehydes are generally more reactive than ketones due to the presence of the hydrogen atom attached to the carbonyl carbon.

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Q2. Which of the following is a method for the preparation of aldehydes? (2019)

Solution:

Aldehydes can be prepared by the oxidation of primary alcohols.

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Q3. What is the general formula for aldehydes? (2023)

Solution:

The general formula for aldehydes is C_nH_(2n+1)CHO, where n is the number of carbon atoms.

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Q4. Which of the following reactions is characteristic of aldehydes? (2023)

Solution:

Aldehydes can undergo oxidation to form carboxylic acids, reduction to form alcohols, and condensation with alcohols to form hemiacetals.

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Q5. Which of the following is a property of aldehydes? (2023)

Solution:

Aldehydes are generally more reactive than ketones due to the presence of the hydrogen atom attached to the carbonyl carbon.

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Q6. Which of the following statements is true regarding the boiling points of aldehydes and ketones? (2023)

Solution:

Ketones generally have higher boiling points than aldehydes due to stronger dipole-dipole interactions.

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Q7. Which of the following is the correct structure for propan-2-one? (2020)

Solution:

Propan-2-one, also known as acetone, has the structure CH3COCH3, indicating it is a ketone.

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Q8. What is the main product when an aldehyde is treated with sodium bisulfite? (2019)

Solution:

The main product formed when an aldehyde reacts with sodium bisulfite is a bisulfite adduct.

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Q9. Which of the following is a property of ketones? (2020)

Solution:

Ketones are generally less polar than aldehydes due to the absence of a hydrogen atom attached to the carbonyl carbon.

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Q10. What is the main product when propanal is treated with sodium bisulfite? (2019)

Solution:

Propanal reacts with sodium bisulfite to form a bisulfite adduct, which is a characteristic reaction of aldehydes.