COMEDK 2024 Evening Shift | Aldehyde and Ketone Question 3 | Chemistry

What is/are the product/s formed when Benzaldehyde and Ethanal react in presence of dil. $$\mathrm{NaOH}$$ followed by heating the intermediate product formed?

2-Methylpent-2-enal & But-2-enal

3-Phenylprop-2-enal & But-2-enal

Only product is But-2-enal

Only product is 2-Phenylprop-2-enal

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

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Which one of the following is the correct order of reagents to be used to convent [A] to [X] ?

COMEDK 2024 Evening Shift Chemistry - Aldehyde and Ketone Question 1 English

$$ \text { Reagents: } \mathrm{PCC}, \mathrm{PCl}_5, \mathrm{LiAlH}_4, \frac{\mathrm{KCN}}{\mathrm{H}_3 \mathrm{O}^{+}} $$

$$ \frac{K C N}{H_3 \mathrm{O}^{+}} \quad \mathrm{PCl}_5 \quad \mathrm{PCC} \quad \mathrm{LiAlH}_4 $$

$$ \mathrm{PCl}_5, \quad \frac{K C N}{H_3 \mathrm{O}^{+}} \quad \mathrm{LiAlH}_4 \quad \mathrm{PCC} $$

$$ \mathrm{LiAlH}_4, \frac{K C N}{H_3 \mathrm{O}^{+}} \quad \mathrm{PCl}_5 \quad \mathrm{PCC} $$

$$ \mathrm{PCC} \quad \mathrm{PCl}_5 \quad \frac{K C N}{\mathrm{H}_3 \mathrm{O}^{+}} \quad \mathrm{LiAlH}_4 $$

COMEDK 2024 Morning Shift

MCQ (Single Correct Answer)

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$$\text { Identify }[\mathrm{B}] \text { and }[\mathrm{C}] \text { formed in the reactions given below. }$$

COMEDK 2024 Morning Shift Chemistry - Aldehyde and Ketone Question 5 English

[B] Propene [C] Propanal

[B] Cyclopropane [C] Ethanal

[B] Propane [C] Ethanol

[B] Propyne [C] Propanone

COMEDK 2024 Morning Shift

MCQ (Single Correct Answer)

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Which one of the following statements is incorrect regarding acetal and ketal formation when Propanal and Propanone are separately reacted with Ethanol in presence of anhydrous $$\mathrm{HCl}$$ gas.

Anhydrous $$\mathrm{HCl}$$ gas decreases the electrophilicity of the Carbonyl Carbon.

Rate of formation of acetal is greater than that of ketal formation.

Propanal and Ethanol should be taken in the approximate ratio of $$1: 2$$ for acetal formation.

Both Propanal and Propanone undergo Nucleophilic addition reaction during this process.

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