Chemistry MCQs
Topic Notes: Chemistry
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
Which chemical substance acts as a dehydrating agent to facilitate the conversion of ethanol into ethene?
Answer:
concentrated sulphuric acid
The dehydration of ethanol to ethene is an elimination reaction. Concentrated sulphuric acid acts as a powerful dehydrating agent by removing a water molecule from the ethanol structure. This process typically occurs at elevated temperatures, where the acid protonates the hydroxyl group, facilitating its departure as water and resulting in the formation of a carbon-carbon double bond.
2
Which reagent is commonly employed as a dehydrating agent to convert ethanol into ethene?
Answer:
concentrated sulphuric acid
The dehydration of ethanol to ethene is an elimination reaction typically catalyzed by concentrated sulfuric acid at high temperatures (around 170°C). The acid acts as a dehydrating agent, removing a water molecule from the ethanol structure to form the carbon-carbon double bond found in ethene.
3
Which alcohol will undergo elimination reaction to give alkene in the presence of acidic potassium dichromate ?
Answer:
Tertiary alcohol
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