Organic Flashcard 1: Alkanes and Alkenes

Front

What is the general formula for alkanes?

Back

CnH2n+2

Answer explanation

The general formula for alkanes is CnH2n+2. This formula represents that for every carbon atom, there are two hydrogen atoms plus two more hydrogen atoms.

Front

How many total atoms are present in heptane (with 7 carbon atoms)?

Back

23

Answer explanation

Heptane is a hydrocarbon with the molecular formula C7H16. To find the total number of atoms present in heptane, we add together the number of carbon atoms and the number of hydrogen atoms.

Number of carbon atoms (C) = 7 Number of hydrogen atoms (H) = 16

Total atoms in heptane = Number of carbon atoms + Number of hydrogen atoms Total atoms in heptane = 7 (C) + 16 (H) Total atoms in heptane = 23

Front

What is the difference between alkanes and alkenes?

Back

The difference is that alkanes have only single bonds between carbon atoms, while alkenes have at least one double bond between carbon atoms.

Answer explanation

Alkanes have single bonds, while alkenes have at least one double bond between carbon atoms.

Front

What is the double bond present in alkenes made up of?

Back

A double covalent bond between the carbon atoms

Answer explanation

The double bond in alkenes is made up of a C=C bond / a double covalent bonds between the carbon atoms.

Front

What is the name of the alkene with two carbon atoms?

Back

Ethene

Answer explanation

The correct name of the alkene with two carbon atoms is Ethene. Ethene is a two-carbon alkene and is the correct choice.

Front

The compound present in large amount in natural gas is: ethene, ethane, methane, methene

Back

methane

Front

What is the process by which alkenes are converted to alkanes?

Back

Addition of hydrogen

Answer explanation

Alkenes are converted to alkanes through catalytic hydrogenation or addition of hydrogen.

Front

A family of organic compound with similar chemical properties and same general formula are called ... .

Back

homologous series

Front

What is the difference between saturated and unsaturated hydrocarbons?

Back

Saturated hydrocarbons have single bonds between carbon atoms, while unsaturated hydrocarbons have at least one double or triple bond between carbon atoms.

Answer explanation

Saturated hydrocarbons have single bonds between carbon atoms, while unsaturated hydrocarbons have double or triple bonds.

Front

What is the name of this hydrocarbon? Options: butane, butene, butanol, polybutene

Back

butene