Match columns A, B, and C suitably. A Reactants B Products C Name of Reaction CH 4 + Cl 2 CO 2 + 2 H 2 O Addition CH 4 + 2 O 2 CH 2 = CH 2 Thermal cracking CH 3 - CH 2 - CH 3 CH 3 Cl + HCl Combustion CH ≡ CH + H 2 CH 2 = CH 2 + CH 4 Substitution

CH 4 + Cl 2 C H 3 C l + H C l Substitution reaction Methane undergoes a substitution reaction with chlorine in the presence of light. This reaction is a substitution reaction because one of the hydrogen atoms from the methane is replaced by a chlorine atom. CH 4 + 2 O 2 CO 2 + 2 H 2 O Combustion When methane is heated in the presence of sufficient air or dioxygen it forms carbon dioxide and water and an enormous amount of heat energy is released. CH 3 - CH 2 - CH 3 CH 2 = CH 2 + CH 4 Thermal cracking Propane when heated in the absence of air undergoes decomposition to form ethene and methane. Ethene reacts with hydrogen in presence of nickel (Ni) catalyst at high temperature to form ethene

Match column I with column II and select the correct option from the given codes. Column | Column II P Chlorination in presence of sunlight (i) Alcohols Q Addition of H 2 to give saturated compounds (ii) Carboxylic acids R Formation of alkene by heating with conc. H 2 SO 4 (iii) Alkenes S Reaction with alcohols to give esters (iv) Alkanes

P - ( iv ) , Q - ( iii ) , R - ( i ) , S - ( ii )

P - ( iv ) , Q - ( i ) , R - ( ii ) , S - ( iii )

P - ( iii ) , Q - ( ii ) , R - ( i ) , S - ( iv )

P - ( iii ) , Q - ( i ) , R - ( ii ) , S - ( iv )

Give reasons: Hydrocarbons are excellent fuels.

Hydrocarbons such as alkanes undergo combustion reactions with oxygen to produce carbon dioxide and water vapour. Alkanes are flammable which makes them excellent fuel.

Give the formula and names of A, B, C and D in the following equation : CH 4 → - HCl Cl 2 A → - HCl Cl 2 B → - HCl Cl 2 C → - HCl Cl 2 D

The given reaction is an example of substitution reaction. Formula of A= CH 3 Cl Name of A= monochloromethane Formula of B= CH 2 Cl 2 Name of B= dichloromethane Formula of C= CHCl 3 Name of C=Trichloromethane Formula of D= CCl 4 Name of D=Tetrachloromethane CH 4 → - HCl Cl 2 CH 3 Cl → - HCl Cl 2 CH 2 Cl 2 → - HCl Cl 2 CHCl 3 → - HCl Cl 2 CCl 4

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Earn 100

The gas used in the preparation of methane is:

50% studentsanswered this correctly

Important Questions on Carbon: An important element

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Science>Chemistry>Carbon: An important element>Methane

Mention one use of biogas.

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Science>Chemistry>Carbon: An important element>Methane

Match columns A, B, and C suitably.

A Reactants	B Products	C Name of Reaction
${CH}_{4} + {Cl}_{2}$	${CO}_{2} + 2 H_{2} O$	Addition
${CH}_{4} + 2 O_{2}$	${CH}_{2} = {CH}_{2}$	Thermal cracking
$CH 3 - {CH}_{2} - {CH}_{3}$	${CH}_{3} Cl + HCl$	Combustion
$CH \equiv CH + H_{2}$	${CH}_{2} = {CH}_{2} + {CH}_{4}$	Substitution

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Science>Chemistry>Carbon: An important element>Methane

What is the condition of substitution reaction of methane with chloride? Write the balanced chemical equation for the first step of the reaction.

EASY

Science>Chemistry>Carbon: An important element>Methane

A hydrocarbon which is a greenhouse gas is:

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Science>Chemistry>Carbon: An important element>Methane

Write the equation for the complete combustion of methane.

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Science>Chemistry>Carbon: An important element>Methane

Why is methane known as marsh gas?

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Science>Chemistry>Carbon: An important element>Methane

Match column I with column II and select the correct option from the given codes.

	Column \|		Column II
P	Chlorination in presence of sunlight	(i)	Alcohols
Q	Addition of $H_{2}$ to give saturated compounds	(ii)	Carboxylic acids
R	Formation of alkene by heating with conc. $H_{2} {SO}_{4}$	(iii)	Alkenes
S	Reaction with alcohols to give esters	(iv)	Alkanes