Advertisements
Advertisements
Question
Explain the following reaction with an example.
Esterification
Advertisements
Solution
Substances having ester as the functional group are formed by a reaction between a carboxylic acid and an alcohol. This reaction is known as esterification.
E.g. When ethanoic acid is heated with ethanol in a water bath in the presence of an acid catalyst (concentrated sulphuric acid), ethyl ethanoate and water are formed.
APPEARS IN
RELATED QUESTIONS
Consider the following comments about saponification reactions:
I. Heat is evolved in these reactions.
II. For quick precipitation of soap, sodium chloride is added to the reaction mixtures.
III. Saponification reactions are a special kind of neutralisation reactions.
IV. Soaps are basic salts of long-chain fatty acids.
The correct comments are
(a) I, II and III
(b) II, III and IV
(c) I, II and IV
(d) Only I and IV
What are esters ?
You have four test tubes, A, B, C and D containing sodium carbonate, sodium chloride, lime water and blue litmus solutions respectively. Out of these the material of which test tube/ test tubes would be suitable for the correct test of acetic/ethanoic acid?
(a) only A
(b) A and B
(c) B and C
(d) A and D
Draw the structure for the following compound:
Ethanoic acid
What is the common name of methanol?
What happens when propanoic acid is warmed with methanol in the presence of a few drops of concentrated sulphuric acid? Write equation of the reaction involved.
An organic compound X of molecular formula C2H4O2 gives brisk effervescence with sodium hydrogen carbonate. Give the name and formula of X.
Consider the following organic compound:
CH3OH, C2H5OH, CH3COCH3, CH3COOH, C2H5COOH, C4H9COOC2H5, CH4, C2H6, CH3CHO, HCHO
Out of these compound:
- Which compound is most likely to be sweet-smelling?
- Which compound on treatment with conc. H2SO4 at 170°C forms an alkene?
- Which compound on repeated chlorination forms chloroform?
- Which compound is added to alcohol to denature it?
- Which compound is a constituent of vinegar?
- Which compound is used to sterilise wounds and syringes?
What do you notice when acetic acid reacts with metals?
What do you notice when acetic acid reacts with alcohol?
What do you observe when acetic acid is added to sodium bicarbonate?
Which of the following observations is true about dilute solution of acetic acid?
(A) It smells like vinegar and turns red litmus blue
(B) It smells like onion and turns blue litmus red
(C) It smells like orange and turns red litmus blue
(D) It smells like vinegar and turns blue litmus red
On adding 2 mL acetic acid to 2 mL of water in a test tube, it was observed that
(A) a clear and transparent solution is formed
(B) a white precipitate is formed almost immediately
(C) two separate layers were formed
(D) a colourless and odourless gas is evolved
How Will You Carry Out the Following Conversions?
Ehane to acitic acid
The functional group present in acetic acid is ______.
Give reason for the following :
Ethyne is more reactive than ethane
Choose the correct alternative and rewrite the following:
Some acetic acid is treated with solid NaHCO3, the resulting solution will be _________________.
Distinguish between esterification and saponification reactions with the help of chemical equations for each.
Which of the following substance produces brisk effervescence with baking soda solution?
The reaction between acetic acid and sodium carbonate is shown in the following figure.
Answer the questions with the help of a diagram.
- Which gas does come out as effervescence in the big test tube?
- What is the colour change in the lime water present in the small test tube?
- Write the related reaction.
