Quiz-12 Aldehydes and Ketones

Aldehydes and Ketones Quiz-12

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Q1. Name the end product in the following series of reactions,

•  CH₄
•  CH₃OH
•  Acetonitrile
•  Ammonium acetate

Solution

CH₃ CN is ethane nitrile or acetonitrile or methyl cyanide.

Q2.The enolic form of acetone contains:

•  9 σ-bonds, 1π-bond and 2 lone pairs
•  8 σ-bonds, 2π-bond and 2 lone pairs
•  10 σ-bonds, 1π-bond and 1 lone pair
•  9 σ-bonds, 2π-bond and 1 lone pairs

Solution

Q3.   Acetaldehyde cannot show

•  Iodoform test
•  Lucas test
•  Benedict’s test
•  Tollen’s test

Solution
Acetaldehyde cannot show Lucas test because Lucas test is given by alcohols only. It is used in the distinction between primary, secondary and tertiary alcohols. Conc. HCl+ anhydrous ZnCI_2 is called Lucas reagent.

Q4. α,β- unsaturated aldehyde is formed in the sequence

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Solution

Q5. In the conversion of Grignard reagent into an aldehyde, the other component used in

•  Ethyl formate
•  Ethyl acetate
•  Ethyl cyanide
•  Hydrogen cyanide

Solution
 

Q6. 

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Solution

Q7.

in given compounds is :

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Solution
Positive IE of alkyl gp. decreases positive charge on C^+ centre of carbonyl gp. and thus, reactivity order is, HCHO>CH₃ CHO>C₂2 H₅ CHO>CH₃ COCH₃

Q8.

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Solution

This reaction is an example of intramolecular Cannizaro’s reaction.

Q9.The end product ‘C’ in the following sequence of chemical reactions is

•  Acetaldehyde oxime
•  Formaldehyde oxime
•  Methyl nitrate
•  Acetoxime

Solution

acetoxime

Q10. The ease of hydrolysis with an alkali in the compounds Is of the order

•  I>II>III>IV
•  IV>III>II>I
•  I>II>IV>III
• II>I>IV>III

Solution
The order of the acidic characters of acid derivative or their ease of hydrolysis with alkali is given below : CH₃COCl>CH₃CO-O-COCH₃>CH₃COOC₂H₅>CH₃CONH