Organic Chemistry Quiz - ICSE Class 10 Chemistry
Free practice quiz: Organic Chemistry (ICSE Class 10 Chemistry). 37 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following functional groups is characterized by a carbonyl group bonded to a hydroxyl group?
- Aldehyde
- Ketone
- Carboxylic acid
- Ester
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Answer: C. Carboxylic acid
A carboxylic acid group (-COOH) consists of a carbonyl group (C=O) directly attached to a hydroxyl group (-OH).
The functional group -CHO is characteristic of which class of organic compounds?
- Ketones
- Aldehydes
- Carboxylic acids
- Alcohols
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Answer: B. Aldehydes
The -CHO group is the aldehyde functional group, where a carbonyl group is bonded to at least one hydrogen atom.
The reaction of ethene with bromine water results in:
- Decolorization of bromine water and formation of 1,2-dibromoethane
- No reaction and bromine water remains colored
- Formation of ethanol and hydrogen
- Formation of ethene dibromide and water
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Answer: A. Decolorization of bromine water and formation of 1,2-dibromoethane
Ethene, an alkene, undergoes an electrophilic addition reaction with bromine water. The double bond breaks, and bromine atoms add across the carbon atoms, forming 1,2-dibromoethane. This process consumes bromine, leading to the decolorization of the bromine water.
What is the name of the process used to convert alkenes into alkanes by adding hydrogen across the double bond?
- Dehydrogenation
- Hydrogenation
- Halogenation
- Hydrolysis
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Answer: B. Hydrogenation
Hydrogenation is the addition of hydrogen to unsaturated compounds like alkenes and alkynes, typically in the presence of a catalyst (e.g., Ni, Pt, Pd), to form saturated compounds (alkanes).
The process of adding hydrogen to unsaturated fatty acids to convert them into saturated fatty acids is:
- Hydrogenation
- Hydrolysis
- Hydrogenolysis
- Halogenation
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Answer: A. Hydrogenation
Hydrogenation involves the addition of hydrogen to double or triple bonds in unsaturated organic molecules. This process is used in the food industry to harden liquid vegetable oils into fats.