Write a balanced chemical equation for the following: Producing ethane from bromo-ethane using Zn / Cu couple in alcohol.

Alkyl halides are used to prepare respective alkanes. Bromo-ethane (ethyl bromide) gets reduced in the presence of Zn / Cu couple in alcohol and converts into ethane and forms hydrogen bromide. C 2 H 5 Br + 2 H → Zn / Cu couple in alcohol C 2 H 6 + HBr

Write a balanced chemical equation for the following: Complete combustion of ethane.

Ethane is used as a fuel to get energy. Complete combustion of ethane liberates carbon dioxide along with the formation of water as vapours due to high temperatures. The combustion of ethane gives heat energy. 2 C 2 H 6 + 5 O 2 → 4 CO 2 + 2 H 2 O + Heat

Draw the structural formula for the following: 2 , 2 dimethyl pentane

2 , 2 dimethyl pentane is called neo-pentane. It is a structural isomer of heptane with a chemical formula C 7 H 16 . Its structural formula is as follows:

State one relevant reason for the following: Soda-lime is preferred to sodium hydroxide in the laboratory preparation of methane.

In a laboratory, methane is prepared by heating the mixture of sodium acetate and soda-lime. Soda-lime is a mixture of sodium hydroxide and calcium oxide. Since, alone sodium hydroxide is a deliquescent substance that absorbs moisture from the atmosphere and becomes liquid and will affect the production of methane instead soda-lime absorbs less water and makes the production effective.

Draw the structural formula for the following: Iso propane

Propane does not exist as iso-propane. The term "-iso" is used when all carbons except one form a chain and the remaining one carbon form a side alkyl chain. The chemical formula for propane is C 3 H 8 . Its structural formula is as follows:

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

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.

MEDIUM

Earn 100

Methane has a low melting point and boiling point, give a reason for it.

Important Questions on Organic Chemistry

HARD

Science>Chemistry>Organic Chemistry>Alkanes

Write a balanced chemical equation for the following:

Producing ethane from bromo-ethane using $Zn / Cu$ couple in alcohol.

HARD

Science>Chemistry>Organic Chemistry>Alkanes

Write a balanced chemical equation for the following:

Complete combustion of ethane.

HARD

Science>Chemistry>Organic Chemistry>Alkanes

Draw the structural formula for the following:

$2, 2$ dimethyl pentane

EASY

Science>Chemistry>Organic Chemistry>Alkanes

Arrange the following according to the instruction given in bracket:

Ethane, methane, ethene, ethyne. (In the increasing order of the molecular weight) [ $H = 1, C = 12$ ]

MEDIUM

Science>Chemistry>Organic Chemistry>Alkanes

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

HARD

Science>Chemistry>Organic Chemistry>Alkanes

State one relevant reason for the following:

Soda-lime is preferred to sodium hydroxide in the laboratory preparation of methane.

HARD

Science>Chemistry>Organic Chemistry>Alkanes

Draw the structural formula for the following:

Iso propane

EASY

Science>Chemistry>Organic Chemistry>Alkanes

Name the saturated hydrocarbon containing two carbon atoms.

EASY

Science>Chemistry>Organic Chemistry>Alkanes

The organic compound which undergoes substitution reaction is _____.

MEDIUM

Science>Chemistry>Organic Chemistry>Alkanes

Among the following reactions, the reaction that "does not" give alkane product is

EASY

Science>Chemistry>Organic Chemistry>Alkanes

Write a balanced chemical equation for the preparation of Methane from sodium acetate.

MEDIUM

Science>Chemistry>Organic Chemistry>Alkanes

Mention one use of biogas.

MEDIUM

Science>Chemistry>Organic Chemistry>Alkanes

Which substance from the following is not obtained during destructive distillation of mineral coal?

MEDIUM

Science>Chemistry>Organic Chemistry>Alkanes

IUPAC name of lowest molecular mass alkane containing chiral carbon is

MEDIUM

Science>Chemistry>Organic Chemistry>Alkanes

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