Match the following columns. Column I Column II (i) C 2 H 5 OH → 300 o C Al 3 O 3 (a) Ethane (ii) C 2 H 4 + H 2 → Ni 200 o C (b) Ethyne (iii) Br - CH 2 - CH 2 - Br + alc . KOH → Boil (c) Ethyl hydrogen sulphate (iv) CH 3 CH 2 OH + H 2 SO 4 → (d) Ethene

Dehydration is a process in which the water molecule is removed from a compound. Ethanol with the formula C 2 H 5 OH can be converted into ethene by dehydration with aluminium oxide Al 2 O 3 . C 2 H 5 OH Ethanol → 300 o C Al 3 O 3 C 2 H 4 Ethene + H 2 O Water The process in which hydrogen is added to an unsaturated compound with multiple bonds is known as hydrogenation. Alkene being an unsaturated compound contains a double bond which combines with hydrogen in the presence of a catalyst to give alkane as the product. Thus, ethene C 2 H 4 combines with hydrogen in the presence of a nickel catalyst give ethane as the product. H 2 C = CH 2 ethene + H 2 Hydrogen → Ni 200 o C H 3 C - CH 3 Ethane Ethyne with the chemical formula C 2 H 2 is the first member of the alkyne series with a triple bond between the carbon atoms. Ethyne can be prepared by boiling 1,2-dibromoethane with alcoholic potassium hydroxide. The chemical equation for the preparation is given below: Br - CH 2 - CH 2 - Br 1 , 2 - dibromoethane + 2 KOH alc Potassium hydroxide → Boiling HC ≡ CH Ethyne + 2 KBr Potassium bromide + 2 H 2 O Water Ethanol can be converted into ethene by dehydration with concentrated sulphuric acid. The initial step during this conversion is given below: CH 3 CH 2 OH Ethanol + H 2 SO 4 Sulphuric acid → CH 3 CH 2 HSO 4 Ethyl hydrogen sulphate + H 2 O Water Column I Column II (i) C 2 H 5 OH → 300 o C Al 3 O 3 (d) Ethene (ii) C 2 H 4 + H 2 → Ni 200 o C (a) Ethane (iii) Br - CH 2 - CH 2 - Br + alc . KOH → Boil (b) Ethyne (iv) CH 3 CH 2 OH + H 2 SO 4 → (c) Ethyl hydrogen sulphate

What is the special feature of the structure of ethyne?

Ethyne with the chemical formula C 2 H 2 is the first member of the alkyne series. Ethyne with a triple bond is an unsaturated simple alkyne with a linear structure, where two hydrogen atoms are bonded to each carbon atoms and the carbon atoms are bonded to each other with the triple bond. The structural formula of ethyne is given below.

E M B I B E

All in One - ICSE Chemistry>Chapter 10 - Hydrocarbons>CHECK POINT 04>Q 3

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IMPORTANT

Earn 100

How is acetylene prepared in the laboratory?

Important Questions on Hydrocarbons

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IMPORTANT

All in One - ICSE Chemistry>Chapter 10 - Hydrocarbons>CHECK POINT 04>Q 4

Write the reaction of oxyacetylene that takes place during a welding process.

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IMPORTANT

All in One - ICSE Chemistry>Chapter 10 - Hydrocarbons>CHECK POINT 04>Q 5

How does bromine solution in

{CCl}_{4}

helps to distinguish alkanes and alkenes?

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10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 10 - Hydrocarbons>CHAPTER EXERCISE>Q 1

The formula of ethane can be written as_____.

(A) $C_{2} H_{6}$

(B) ${CH}_{4}$

(C) $C_{2} H_{5}$

Enter the correct answer as A, B or C.

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All in One - ICSE Chemistry>Chapter 10 - Hydrocarbons>CHAPTER EXERCISE>Q 4

The formula of methane is

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All in One - ICSE Chemistry>Chapter 10 - Hydrocarbons>CHAPTER EXERCISE>Q 5

The formula of 1,1,2,2 -tetrachlorothane is

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All in One - ICSE Chemistry>Chapter 10 - Hydrocarbons>CHAPTER EXERCISE>Q 6

An organic compound undergoes addition reaction and gives a red colour precipitate with ammoniacal cuprous chloride. Therefore, the organic compound could be

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All in One - ICSE Chemistry>Chapter 10 - Hydrocarbons>CHAPTER EXERCISE>Q 7

The formation of 1,2 -dibromoethane from ethene and bromine is an example of

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10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 10 - Hydrocarbons>CHAPTER EXERCISE>Q 8

Match the following columns.

	Column I		Column II
(i)	$C_{2} H_{5} OH \to_{300^{o} C}^{{Al}_{3} O_{3}}$	(a)	Ethane
(ii)	$C_{2} H_{4} + H_{2} \to_{Ni}^{200^{o} C}$	(b)	Ethyne
(iii)	$Br - {CH}_{2} - {CH}_{2} - Br + alc . KOH \overset{Boil}{\to}$	(c)	Ethyl hydrogen sulphate
(iv)	${CH}_{3} {CH}_{2} OH + H_{2} {SO}_{4} \to$	(d)	Ethene

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