10th Class Chemistry Chapter 4 Hydrocarbons Short Question Answer

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10th Class Chemistry Chapter 4 Hydrocarbons Short Question Answer

Give some uses of alkynes?

Give some uses of alkynes?

Answer : It is also used for artificial ripening of fruits.
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Why the alkynes are called acetylenes?

Why the alkynes are called acetylenes?

Answer : Alkynes are also called acetylenes because of the name of the first member of the series id acetylene.
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What is petrochemical industry?

What is petrochemical industry?

Answer : The organic compounds prepared from hydrocarbons are called petrochemicals. Some of the important petrochemicals are methyl alcohol, ethyl alcohol,formic acid, chloroform, carbon tetrachloride, ethylene, butadiene, benzene, toluene,etc.
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Why the burning of alkanes require sufficient supply of oxygen?

Why the burning of alkanes require sufficient supply of oxygen?

Answer : Alkanes burn in the presence of excess of air or oxygen to produce a lot of heat, carbon dioxide and water. This reaction takes place in automobile combustion engines, domestic heaters and cooking appliances. It is highly exothermic reaction and because of it alkanes are used as fuel.
CH4 +2O2→ CO2 +2H2O +heat
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What is the difference between a straight and a branched chain hydrocarbons?

What is the difference between a straight and a branched chain hydrocarbons?

Answer : Straight hydrocarbons: Straight chain compound are those in which carbon atoms are linked with each other through double and triple bonds forming a straight chain
H3C-CH2-CH2-CH3
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Why are alkenes reactive?

Why are alkenes reactive?

Answer : Alkenes are reactive compounds because the electrons of the double bond are easily available for reaction.
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What is the simplest alkane?

What is the simplest alkane?

Answer : Methane is the simplest alkane CH₄.
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Why are hydrocarbons considered as parent organic compounds?

Why are hydrocarbons considered as parent organic compounds?

Answer : Hydrocarbons are regarded as the parent organic compounds since other organic compounds are considered to be derived from them by the replacement of one or more hydrogen atoms by other atoms or groups of atoms.
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Give a test used to identify unsaturation of an organic compound?

Give a test used to identify unsaturation of an organic compound?

Answer : Dissolve about 0.2 if organic compound in water in a test tube .add 2-3 drops of alkanes KMnO₄ solution in it shake the disappearance of pink color indicates the presence of unsaturation in the organic compound.
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Give few uses of ethene?

Give few uses of ethene?

Answer : Ethene is used for artificial ripening of fruits Use as a general anaesthetic for manufacture of polythene.
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Give a few uses of ethane.

Give a few uses of ethane.

Answer : Ethane is used
1: for a artificial ripening of fruits
2: as a general anaesthetic
3: for manufacture of polythene: Polythene is a plastic material used in packaging, toys, bags etc. ethyl alcohol, ethylene, glycol, diethyl ether etc. ethylene oxide is used as a fumigant, ethylene glycol is used as an anti-freeze, diethyl ether and ethyl alcohol are used as solvents and
4: for making poisonous mustard gas which is used in chemical warfar.
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Why are the alkanes used as fuel?

Why are the alkanes used as fuel?

Answer : Alkanes burn in the presence of excess of air or oxygen to produce a lot of heat, carbon dioxide and water. This reaction takes place in automobile combustion engines, domestic heaters and cooking appliances. It is highly exothermic reaction and because of it alkanes are used as fuel
CH4 + 2O2→ CO2 +2H2O +heat
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Physical properties of alkanes?

Physical properties of alkanes?

Answer : Physicsl state: Alkanes form a homologous series of compounds and first four members of the series are gases. The alkanes consisting of C3 to C10 are liquid while the higher members are solids.
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Define saturated hydrocarbons with examples.

Define saturated hydrocarbons with examples.

Answer : The hydrocarbons in which all the four valences of carbon atoms are fully satisfied (saturated) by single bonds with other carbon atoms and hydrogen atoms are called saturated hydrocarbons. Saturated hydrocarbons are also called alkanes. Thus, an alkane is a hydrocarbon in which the carbon atoms are connected by only single covalent bond (there are no double or triple covalent bonds in alkanes.Methane (CH4), Ethane (C2H6), propane (C3H8) and butane (C4H10) are all saturated hydrocarbons because they contain only carbon-carbon single bonds.
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What is plastic industry?

What is plastic industry?

Answer : Hydrocarbons are used as raw materials for the preparation of a large variety of synthetic polymers Called plastics like polythene, polyester. These can be given any shape when soft and on hardening make a durable article to be sued in electric and sewages items and a lot of other household items in common life.
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What do you mean by halogenation? Give the reaction of methane with chlorine in bright sunlight?

What do you mean by halogenation? Give the reaction of methane with chlorine in bright sunlight?

Answer : Halogenation in which one or more hydrogen atoms of a saturated compound are replaced with halogen atom is called halogenation reaction
CH4 + 2CL2 → C+4HCL
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Identify propane from propane with a test?

Identify propane from propane with a test?

Answer : Propane and propane can be identified by bromide water test. Propane does not give bromine water test because it is saturated hydrocarbons. While propene decolorized the bromine water because propane is unsaturated hydrocarbon having double bond.
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What is Rubber industry?

What is Rubber industry?

Answer : Hydrocarbons are used to prepare synthetic rubber, such as acetylene is used to prepare butadiene rubber used for making footwear, tyres and toys. Similarly, a good quality rubber neoprene is prepared from chloroprene.
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Why colour of bromine water discharge on addition of ethane in it?

Why colour of bromine water discharge on addition of ethane in it?

Answer : When bromine water (a solution of bromine in water having red-brown color) is added to ethane in an inert solvent like carbon tetrachloride, its color is discharges at once.
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Give the reduction of alkyl halide.

Give the reduction of alkyl halide.

Answer : Reduction means addition of nascent hydrogen. It is a replacement of a halogen atom with hydrogen atom in the presence of Zn metal and HCl.
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Why are hydrocarbons soluble in organic solvents?

Why are hydrocarbons soluble in organic solvents?

Answer : Hydrocarbon are soluble in organic solvents because both of them are non-polar covalent compounds the principle of solubility is like dissolve like.
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What is Synthetic detergents?

What is Synthetic detergents?

Answer : Long chain hydrocarbons obtained from petroleum are used to make synthetic detergents and washing powders. These detergents are sodium salts of alkyl hydrogen sulphate. These detergents have better and stronger cleaning properties than that of sofas. They can be used even in hard water.
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Why hydrocarbon used as a fuel?

Why hydrocarbon used as a fuel?

Answer : The main constituent of fuels (coal, petroleum and natural gas) are hydrocarbons. When hydrocarbons are burnt in air the reaction is called combustion. It is highly exothermic reaction, i.e. it produces a lot of heat. The basic combustion reaction is
CH4 + 2O2? CO2 + 2H2O + heat.
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How can you identify ethene from ethene?

How can you identify ethene from ethene?

Answer : We identify ethene from ethene by bromine water test, ethane does not give bromine water test while ethane decolourized the bromine water because ethene is saturated and ethane is unsaturated hydrocarbon.
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Why alkenes are known as olefins?

Why alkenes are known as olefins?

Answer : Alkenes are known as olefins because first members of alkenes form oily products when react with halogens. Olefins means oil forming.
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Why alkanes are called paraffins?

Why alkanes are called paraffins?

Answer : Inalkanes al the bonds of carbon atoms are single that means valences electrons of carbon atoms are saturated. Therefore they are least reactive that is the reason, alkanes are called parafins.
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State one important use of each.

State one important use of each.

Answer : Ethene: Ethene is used for artificial ripening of fruits
Acetylene: Acetylene is used to prepare other chemicals, such as alcohols, acetaldehyde and acids
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What do you mean by halogenations?

What do you mean by halogenations?

Answer : A reaction in which one or more hydrogen atoms of a saturated compounds are replaced with halogen atom is called halogenations.
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Justify the alkane give substitution reaction?

Justify the alkane give substitution reaction?

Answer : A reaction in which one or more hydrogen atoms of a saturated compound are replaced with some other atoms (like halogen) is called a substitution reaction. Because alkanes has single bonds not double bonds so it do not add more atoms, it give substitution reaction.
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What is Synthetic fiberindustry?

What is Synthetic fiberindustry?

Answer : Hydrocarbons are used to prepare synthetic fibers like nylon. Rayon polyesters these fibers have better qualities like greater strength good elasticity, resistance to wear and tear.
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