Give reasons for your answers 1. Whenever we feel drowsy or sleepy, we start yawning. Does yawning help us in anyway? 2. A rose plant was uprooted from the soil. Most of the root tips, with root hairs got left behind in the soil. It was planted in a pot with new soil and regularly watered. Will the plant grow or die? 3. A spaceship travels 36,000 km in one hour. Express its speed in km/s. 4. How does the magnetic effect of electric current help in working of electric bell? 5. You are given three mirrors of different types. How will you identify each one of them?Give reasons for your answers 1. Whenever we feel drowsy or sleepy, we start yawning. Does yawning help us in anyway? 2. A rose plant was uprooted from the soil. Most of the root tips, with root hairs got left behind in the soil. It was planted in a pot with new soil and regularly watered. Will the plant grow or die? 3. A spaceship travels 36,000 km in one hour. Express its speed in km/s. 4. How does the magnetic effect of electric current help in working of electric bell? 5. You are given three mirrors of different types. How will you identify each one of them?
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Answer:
Give reasons for your answers 1. Whenever we feel drowsy or sleepy, we start yawning. Does yawning help us in anyway? 2. A rose plant was uprooted from the soil. Most of the root tips, with root hairs got left behind in the soil. It was planted in a pot with new soil and regularly watered. Will the plant grow or die? 3. A spaceship travels 36,000 km in one hour. Express its speed in km/s. 4. How does the magnetic effect of electric current help in working of electric bell? 5. You are given three mirrors of different types. How will you identify each one of them?Give reasons for your answers 1. Whenever we feel drowsy or sleepy, we start yawning. Does yawning help us in anyway? 2. A rose plant was uprooted from the soil. Most of the root tips, with root hairs got left behind in the soil. It was planted in a pot with new soil and regularly watered. Will the plant grow or die? 3. A spaceship travels 36,000 km in one hour. Express its speed in km/s. 4. How does the magnetic effect of electric current help in working of electric bell? 5. You are given three mirrors of different types. How will you identify each one of them?
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Answer:
The reaction of carboxylic acid with alcohol forms an ester. This process of formation of ester is called esterification.
:CH3COOH+CH3CH2OH→CH3COOCH2CH3+H2O.
Activity :-
(i) Take 1 ml of ethanol and 1 ml of glacial acid in a boiling tube and mix the contents well.
(ii) Add few drops of conc. H2SO4 to it.
(iii) Warm the contents on a water bath for a few minutes.
(iv) Now pour the solution in a beaker containing 20-50 ml of water.
(v) A sweet fruity smell indicating formation of an ester is observed.