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Question : 34
Total: 39
(a) (i) A compound 'A' with a molecular formula of C 2 H 4 O 2 A
(ii) When the above stated compound 'A B C 2 H 6 O C
(1) Identify 'B C
(2) State the role of acid in this reaction.
(3) Write chemical equation for the reaction involved
OR
b) (i) Name the compound formed when ethanol is heated at443 K H 2 SO 4
State the role of conc.H 2 SO 4
(ii) What is hydrogenation? Explain it with the help of a chemical equation. State the role of this reaction in industry.
(ii) When the above stated compound '
(1) Identify '
(2) State the role of acid in this reaction.
(3) Write chemical equation for the reaction involved
OR
b) (i) Name the compound formed when ethanol is heated at
State the role of conc.
(ii) What is hydrogenation? Explain it with the help of a chemical equation. State the role of this reaction in industry.
Solution:
(a) (i) Since,
As we know that, acid reacts with base to give salt and water CompoundA
Chemical equation for acid and base reaction:
Acid + Base → Salt + Water
HX + MOH → MX + HOH
CH 3 COOH ( a q ) + NaOH ( a q ) → CH 3 COONa ( a q ) + H 2 O ( l )
Thus, Compound 'A is CH 3 COOH
(ii) Carboxylic acids can react with alcohols to form esters in a process called Fischer esterification. An acid catalyst is required and the alcohol is also used as the reaction solvent.
(1) Compound B is Ethanol and C is Ethyl acetate.
(2)HCl
(3) A sweet-smelling compound formed by reacting acetic acid with ethanol in the presence of hydrochloric acid is ethyl acetate.
CH 3 −
− OH + HOC 2 H 5
CH 3 −
− OC 2 H 5
OR
(b) (i) Ethene is formed when ethanol at443 K
The mechanism of acid dehydration of ethanol to yield ethene is:
1. First step is the protonation of oxygen atom of -OH group.
2. Second step is the loss of a molecule of water to form carbonium ion.
3. Last step is deprotonation to form carbon- carbon double bond.
+
433 K H 2 SO 4
(ii) Hydrogenation is the process of addition between hydrogen and other compounds in presence of a catalyst.
For example: Alkene can be converted to alkane by usingH 2 Pt , Ni Pd
CH 2 = CH 2 → CH 3 CH 3
The industrial applications are as follows:
1. To convert alkenes into alkanes.
2. To prepare vegetable ghee from vegetable oils.
As we know that, acid reacts with base to give salt and water Compound
Chemical equation for acid and base reaction:
(ii) Carboxylic acids can react with alcohols to form esters in a process called Fischer esterification. An acid catalyst is required and the alcohol is also used as the reaction solvent.
(1) Compound B is Ethanol and C is Ethyl acetate.
(2)
(3) A sweet-smelling compound formed by reacting acetic acid with ethanol in the presence of hydrochloric acid is ethyl acetate.
(b) (i) Ethene is formed when ethanol at
The mechanism of acid dehydration of ethanol to yield ethene is:
1. First step is the protonation of oxygen atom of -OH group.
2. Second step is the loss of a molecule of water to form carbonium ion.
3. Last step is deprotonation to form carbon- carbon double bond.
Concentrated sulphuric acid can act as a dehydrating agent. Hence, ethanol when heated at
(ii) Hydrogenation is the process of addition between hydrogen and other compounds in presence of a catalyst.
For example: Alkene can be converted to alkane by using
The industrial applications are as follows:
1. To convert alkenes into alkanes.
2. To prepare vegetable ghee from vegetable oils.
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