Question

1. Draw the structure of an alkane or cycloalkane that has more than three but fewer than 9 carbon atoms and only primary hydrogens.

B. Draw the structure of an alkane or cycloalkane that has 5 carbon atoms and only secondary Hydrogen atoms.

Answer 1

Concepts and reason

If the hydrogen atom present on a carbon atom which is bonded with other carbon atom, then that hydrogen is known as primary hydrogen.

If the hydrogen atom present on a carbon atom which is bonded with other two carbon atom, then that hydrogen is known as secondary hydrogen.

If the hydrogen atom present on a carbon atom which is bonded with other three carbon atom, then that hydrogen is known as tertiary hydrogen.

Fundamentals

Alkanes contain only linear and branched chains of carbon atoms. The molecular formula of alkanes is . Here, n is the integer.

Cycloalkanes contain one or more rings. The molecular formula for cycloalkanes is . Here, n is the integer.

Primary is represented as , secondary is represented as and tertiary is represented as .

Part A

The possible structures are as follows:

Draw the possible branched chain alkane which contains only secondary hydrogens as follows:

Part B

Draw the possible straight chain and cyclic alkanes that contains five carbon atoms.

Ans: Part A

The structure of an alkane which contains only primary hydrogens is,

Part B

The structure of cycloalkane which contains five carbon atoms in its ring with the secondary hydrogens is cyclopentane.