Two different organic compounds A and B have the same molecular formula of C 2 H 6 O . A reacts with metallic sodium to produce hydrogen gas but B does not react with metallic sodium. Write structural formulas of the compounds A and B. Write the balanced chemical equation of the reaction of A with metallic sodium.

Molecular formula of the compound is given as C 2 H 6 O . The general formula can be written as, C n H 2 n + 2 O . The two compounds with this molecular formula are, CH 3 CH 2 OH and CH 3 - O - CH 3 . Compound A is ethanol as it reacts with metallic sodium to produce hydrogen gas while B is ether which does not react with sodium. The balanced chemical equation of the reaction of ethanol with metallic sodium is given as, 2 CH 3 CH 2 OH + 2 Na → 2 C 2 H 5 ONa + H 2

Write the condition for the reaction of addition of hydrogen to ethylene. Write the balanced chemical equation of the reaction. Mention one use of CNG.

Addition of hydrogen to ethylene takes place in the presence of catalyst such as finely divided nickel at 200 - 250 ° C or finely divided platinum or palladium at room temperature. The reaction can be given as, C 2 H 4 + H 2 → Ni 200 ° C C 2 H 6 CNG is compressed natural gas. It is used as fuel which can be used in place of gasoline (petrol), diesel fuel and propane/LPG. It is safer than other fuels in the event of a spill, because natural gas is lighter than air and disperses quickly when released.

Mention one use of ethylene.

Ethylene is the simplest alkene and also the second simplest unsaturated hydrocarbon with formula CH 2 = CH 2 . Ethylene is an industrial organic compound produced by heating either natural gas or petroleum. Ethylene regulates a number of physiological processes and hence is used as a plant growth regulator, it is widely used for ripening fruits and for the production of more flowers and fruits.

Write with an example what is meant by saturated hydrocarbon.

Hydrocarbons in which the carbon atoms are linked to each other by single bonds only are known as saturated hydrocarbons. A hydrocarbon is an organic compound whose only constituents are carbon and hydrogen. Examples include alkanes and cycloalkanes. Ethane ( CH 3 − CH 3 ), butane CH 3 − CH 2 − CH 2 − CH 3 ) etc are saturated compounds.

Write with an example what is meant by functional group.

Functional groups are the substituent atoms or groups of atoms that are attached to specific molecules. They are responsible for the chemical reactions that the molecule they are attached to participate in. The presence of a functional group in a molecule implies that the behaviour and the chemical reactions of the molecule in question can be predicted in a systematic fashion. For example, The alcohol group, − OH , present in ethanol C 2 H 5 OH is an example of a functional group.

Select the members of a homologous series from the following compounds and arrange them in increasing order of their molecular weights: CH 3 COOH , CH 3 CH 2 OH , CH 3 OCH 3 , CH 3 OH , C 2 H 4 , C 2 H 6 , CH 3 CH 2 CH 2 OH , C 3 H 4

A homologous series is a sequence of compounds with the same functional group and similar chemical properties in which the members of the series differ by - CH 2 group. The members of a homologous series and the increasing order of their molecular weight from the following compounds are: CH 3 OH < CH 3 OCH 3 = CH 3 CH 2 OH < CH 3 CH 2 CH 2 OH

The molecular formula of the organic compound is C 2 H 4 O 2 , the compound is soluble in water and on the addition of NaHCO 3 to the aqueous solution of the compound, CO 2 is evolved. Identify the organic compound. Write with condition and balanced chemical equation, the reaction of the compound with ethanol.

When carboxylic acid reacts with sodium bicarbonate solution, carbon dioxide is produced along with sodium acetate in a brisk effervescence. Hence, the given compound is a carboxylic acid which is acetic acid CH 3 COOH . The reaction is as follows: CH 3 COOH + NaHCO 3 → CH 3 COONa + H 2 O + CO 2 Further, acetic acid is soluble in water. When ethyl alcohol reacts with acetic acid, the hydroxyl group of the alcohol and the hydrogen of the acid react together and get eliminated as a water molecule. Ethanoic acid reacts with ethanol in the presence of concentrated sulphuric acid as a catalyst to produce the ester, ethyl ethanoate. The reaction is as follows: CH 3 COOH + C 2 H 5 OH → H 2 SO 4 CH 3 COOC 2 H 5 + H 2 O

Mention one use of tetrafluoroethylene.

Tetrafluoroethylene CF 2 = CF 2 , or teflon, finds its uses in industries. It is used to make electrical insulators and coating for non-stick cook wares.

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 13 - Organic Chemistry>West Bengal Board-2018>Q 10

MEDIUM

10th West Bengal Board

IMPORTANT

Earn 100

Write with balanced chemical equation of what happens when ethylene reacts with bromine.

Important Questions on Organic Chemistry

EASY

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 13 - Organic Chemistry>West Bengal Board-2019>Q 11

Which of the following is the alkyl group containing two carbon atoms?

EASY

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 13 - Organic Chemistry>West Bengal Board-2019>Q 12

Write down the unit of calorific value of fuel.

EASY

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 13 - Organic Chemistry>West Bengal Board-2019>Q 13

What is the value of

H - C - H

bond angle in methane?

EASY

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 13 - Organic Chemistry>West Bengal Board-2019>Q 14

What is the I.U.P.A.C name for

{CH}_{3} {CH}_{2} COOH

?

EASY

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 13 - Organic Chemistry>West Bengal Board-2019>Q 15

What is the industrial source of CNG?

MEDIUM

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 13 - Organic Chemistry>West Bengal Board-2019>Q 16

Write with balanced chemical equation what happens when methane is burnt in oxygen.

MEDIUM

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 13 - Organic Chemistry>West Bengal Board-2019>Q 17

Mention one use of each of acetic acid and ethyl alcohol.

HARD

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 13 - Organic Chemistry>West Bengal Board-2019>Q 18

Write a balanced chemical equation of the reaction of sodium hydroxide with acetic acid. Which one between jute and polythene is environmental friendly for packaging and why?

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