Home
Class 12
CHEMISTRY
A hydroxyl acid on heating gives a 5 - m...

A hydroxyl acid on heating gives a 5 - membered lactone. The acid is

A

`CH_2OHCH_2CH_2COOH`

B

`CH_3CHOHCH_2COOH`

C

`CH_3CH_2CHOHCOOH`

D

`CH_3CHOHCHOHCOOH`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem of identifying the hydroxyl acid that forms a 5-membered lactone upon heating, we can follow these steps: ### Step 1: Understand the Structure of Hydroxyl Acid A hydroxyl acid contains both a hydroxyl group (-OH) and a carboxylic acid group (-COOH). This means we need to identify a compound that has these functional groups. **Hint:** Look for compounds that have both -OH and -COOH groups in their structure. ### Step 2: Identify the Formation of a 5-Membered Lactone A lactone is a cyclic ester that can form when a hydroxyl acid undergoes dehydration (loss of water) upon heating. For a 5-membered lactone, the hydroxyl group and the carboxylic acid group must be positioned such that they can react to form a ring of five atoms. **Hint:** Consider how the -OH and -COOH groups can interact to form a cyclic structure. ### Step 3: Analyze Possible Hydroxyl Acids We need to find a specific hydroxyl acid that can yield a 5-membered lactone. One possible structure is: - **CH2OH (hydroxymethyl group)** - **CH2CH2 (two carbon chain)** - **COOH (carboxylic acid group)** This compound can be represented as CH2OH-CH2-CH2-COOH. **Hint:** Visualize the structure and see how the hydroxyl and carboxylic acid groups can come together to form a 5-membered ring. ### Step 4: Confirm the Structure When this hydroxyl acid is heated, the -OH group can react with the -COOH group, leading to the formation of a 5-membered lactone. The resulting lactone will consist of five atoms in the ring, including the carbon atoms from the chain and the carbonyl carbon from the carboxylic acid. **Hint:** Draw the reaction mechanism to see how the lactone is formed from the hydroxyl acid. ### Step 5: Conclusion Based on the analysis, the hydroxyl acid that forms a 5-membered lactone upon heating is CH2OH-CH2-CH2-COOH, which corresponds to option A. **Final Answer:** The acid is CH2OH-CH2-CH2-COOH (option A).
Promotional Banner

Similar Questions

Explore conceptually related problems

beta- Hydroxy propanoic acid on heating gives acrylic acid. Acrylic acid exists in two diastereomers.

Arachidonic acids gives rise to

Orthophosphorus acid on heating gives ______

The compound that gives a lactone on heating is

An alkene A on ozonolysis yields acetone and an aldehyde. The aldehyde is easily oxidised to an acid B. When B is treated with bromine in presence of yields a compound C which on hydrolysis gives a hydroxyle acid D. This acid can also be obatined from acetone by the reaction with hydrogen cyanide followed by hydrolysis. Identify the compounds A, B C and D.

Carboxylic acid on treating with which reagent does not give acid chloride ?

Which of the following acid will form an (a) Anhydride on heating and (b) Acid amide on strong heating with ammonia?

Identify which of the following terms matches with the appropriate descriptions 1 to 5 A: Hydracid (B) Monobasic acid (C ) Less volatile acid ( D) Weak acid (E ) Tribasic acid (F ) Dibasic acid (G ) More volatile acid 1. An acid having basicity 1 and having only one replacement hydrogen ion per molecular of the acid. 2. An acid which dissociates to give a low concentration of H^(+) ions 3. An acid containing hydrogen and a non-metallic element other than oxygen. 4. The type of acid which generally displaces another acid when the acid is heated with a salt 5. The type of acid which reacts with a base to give an acid salt and a normal salt

Although boric acid B(OH)_(3) , contains three hydroxyl groups yet it behaves as a monobasic acid. Explain why?