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.

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

MEDIUM

Earn 100

Consider the following carbides.

I. ${Al}_{4} C_{3}$ II. ${Mg}_{2} C_{3}$

III. ${Be}_{2} C$ IV. ${CaC}_{2}$

Select the correct statement about these carbides when they react with water.

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Important Questions on Hydrocarbons

EASY

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

By which of the following reactions, methane can't be prepared:

A =

Wurtz reaction

B =

Reduction of alkyl halides with zinc and dil.

HCl

C =

Kolbe's electrolysis

D =

Catalytic hydrogenation of alkenes

EASY

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

Which of the following reactions is used for producing symmetrical alkane with double carbon atoms?

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

Assertion (A): Sodium acetate on Kolbe's electrolysis gives ethane.

Reason (R): Methyl free radical is formed at cathode.

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

{CH}_{3} Br + 2 Na + {CH}_{3} Br \overset{Dry ether}{\to} {CH}_{3} - {CH}_{3} + 2 NaBr

The reaction is

EASY

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

Which of the following alkane cannot be made in good yield by Wurtz reaction?

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

In the reaction of

1 -

bromo

- 3 -

chlorocyclobutane with two equivalents of sodium in ether, the major product is

EASY

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

Reaction of sodium acetate with soda lime will produce which of the following?

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

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

EASY

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

Which one of the following reactions gives the product with less number of carbon atoms than the starting material?

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

If a mixture of iodomethane and iodoethane is treated with sodium metal in presence of dry ether it forms

EASY

Chemistry>Organic Chemistry>Hydrocarbons>Alkanes

Hydrocarbon

(A)

reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to a gaseous hydrocarbon containing less than four carbon atoms,