Question:
What types of compounds are formed when alkanones react with ethane-1,2-diol?
What types of compounds are formed when alkanones react with ethane-1,2-diol?
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Ketones react with a diol under dry HCl to give a five-membered cyclic ketal.
Updated On: Nov 12, 2026
- hemiacetals
- cyclic ketals
- cyclic acetals
- acetals
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Aldehydes and ketones react with dihydric alcohols in the presence of dry \(\text{HCl}\) to form cyclic derivatives.
Step 2: Reaction
An alkanone (ketone) plus ethane-1,2-diol gives a five-membered ring with loss of water.
Step 3: Product name
The cyclic product from a ketone is called an ethylene glycol ketal.
Final Answer:
Alkanones form cyclic ketals with ethane-1,2-diol. \[ \boxed{\text{(B) }\text{cyclic ketals}} \]
Aldehydes and ketones react with dihydric alcohols in the presence of dry \(\text{HCl}\) to form cyclic derivatives.
Step 2: Reaction
An alkanone (ketone) plus ethane-1,2-diol gives a five-membered ring with loss of water.
Step 3: Product name
The cyclic product from a ketone is called an ethylene glycol ketal.
Final Answer:
Alkanones form cyclic ketals with ethane-1,2-diol. \[ \boxed{\text{(B) }\text{cyclic ketals}} \]
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