Functional Groups Quiz - CBSE Class 12 Chemistry

Free practice quiz: Functional Groups (CBSE Class 12 Chemistry). 11 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Chemistry practice quiz has 11 multiple-choice questions on Functional Groups, and 11 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following functional groups is characterized by a carbonyl group bonded to a hydroxyl group?

   1. Alcohol
   2. Aldehyde
   3. Carboxylic acid
   4. Ketone
   Show answer

   Answer: C. Carboxylic acid

   Carboxylic acids contain the -COOH group, which consists of a carbonyl group (C=O) bonded to a hydroxyl group (-OH).

2. What is the general formula for an aldehyde?

   1. R-COOH
   2. R-CHO
   3. R-CO-R
   4. R-OH
   Show answer

   Answer: B. R-CHO

   Aldehydes have the general formula R-CHO, where R is an alkyl or aryl group.

3. A compound with the formula C3H6O can be either a ketone or an aldehyde. Which spectroscopic technique would be most useful in distinguishing between these two possibilities?

   1. Mass Spectrometry
   2. Infrared Spectroscopy
   3. Nuclear Magnetic Resonance Spectroscopy
   4. Ultraviolet-Visible Spectroscopy
   Show answer

   Answer: B. Infrared Spectroscopy

   Infrared spectroscopy can distinguish between aldehydes and ketones based on the characteristic absorption frequencies of their carbonyl groups (C=O). Aldehydes show additional absorption bands not present in ketones.

4. Describe the mechanism of esterification.

   1. Nucleophilic addition
   2. Electrophilic addition
   3. Nucleophilic acyl substitution
   4. Electrophilic aromatic substitution
   Show answer

   Answer: C. Nucleophilic acyl substitution

   Esterification involves the nucleophilic attack of the alcohol on the carbonyl carbon of the carboxylic acid, leading to the formation of an ester and water.

5. Design a synthetic route to prepare a specific ester from a given carboxylic acid and alcohol, considering reaction conditions and potential side reactions.

   1. Multiple steps may be required involving acid catalysis and purification techniques.
   2. Direct reaction of the acid and alcohol under acidic conditions is sufficient.
   3. Reaction with a Grignard reagent is required.
   4. The reaction is not feasible.
   Show answer

   Answer: A. Multiple steps may be required involving acid catalysis and purification techniques.

   Ester synthesis often requires careful control of reaction conditions (acid catalysis) and purification techniques (e.g., distillation) to obtain a high yield and purity of the desired ester, potentially needing to address side reactions.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Identify the functional group present in CH3CH2OH.
2. Which functional group contains a carbon-oxygen double bond and is found in both aldehydes and ketones?
3. Predict the products of the oxidation of a secondary alcohol.
4. Explain the difference in reactivity between aniline and nitrobenzene towards electrophilic aromatic substitution.
5. Discuss the application of various spectroscopic techniques (IR, NMR, Mass Spec) in the structural elucidation of an unknown organic compound containing multiple functional groups.
6. Analyze a complex reaction scheme involving multiple functional groups, predicting the major and minor products and justifying your reasoning based on reaction mechanisms and regioselectivity.

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