In the structure of 4-isopropyl-2,4,5-trimethylheptane, identify the primary, secondary, and tertiary hydrogens.

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In the structure of 4-isopropyl-2,4,5-trimethylheptane, identify the primary, secondary, and tertiary hydrogens.

Expert Answer
Expert Answer

Solved Chegg Answers

General guidance

Concepts and reason
 

The hydrogens which are attached to primary carbons are called primary hydrogens. The hydrogens which are attached to secondary carbons are called secondary hydrogens. Similarly, the hydrogens which are attached to tertiary carbons are called tertiary hydrogens.

 

Fundamentals

Primary is represented as 1o{1^{\rm{o}}} , secondary is represented as 2o{2^{\rm{o}}} and tertiary is represented as 3o{3^{\rm{o}}} . Primary carbons are the carbons which are attached to one other carbon atom and secondary carbons are the carbons which are attached to two other carbon atoms. Similarly, tertiary carbon atoms are attached to three other carbon atoms.

 
First Step | All Steps | Answer Only

Step-by-step

Step 1 of 2

The structure of 4−isopropyl−2,4,5−trimethylheptane{\rm{4 – isopropyl – 2,4,5 – trimethylheptane}} is as follows:

ÇHz
ÇHz ÇHz
H2 L
C—•— •—
H2
H2C—
C—
•—CH;
CH
H3C
CH3
4-isopropyl-2,4,5-trimethylheptane

There are 7 primary carbons, two secondary carbons and three tertiary carbons are present in this structure.

Explanation | Common mistakes | Hint for next step

In this compound, all the terminal carbons are attached to only other carbon atoms. Hence, they are primary carbons. In the remaining carbons, the carbons in −CH2− – {\rm{C}}{{\rm{H}}_2} – groups are attached to two other carbon atoms. Hence, they are secondary carbons. Similarly, the carbons in −CH−l\mathop { – {\rm{CH}} – }\limits^{\rm{l}} groups are attached to 3 other carbons. Hence, they are tertiary carbons.

Step 2 of 2

Identify the primary, secondary, and tertiary hydrogens as follows:

H2
H3C—
CH—
H2
C—
T
C—
C—
C—CH3
CH
P H3C
CH3 p
4-isopropyl-2,4,5-trimethylheptane

The primary, secondary, and tertiary hydrogens as follows:

H2
H3C—
CH—
H2
C—
T
C—
C—
C—CH3
CH
P H3C
CH3 p
4-isopropyl-2,4,5-trimethylheptane


Explanation

The hydrogens present on primary carbons are primary hydrogens, the hydrogens present on secondary carbons are secondary hydrogens and the hydrogens present on tertiary carbon are tertiary hydrogens.

Answer

The primary, secondary, and tertiary hydrogens as follows:

H2
H3C—
CH—
H2
C—
T
C—
C—
C—CH3
CH
P H3C
CH3 p
4-isopropyl-2,4,5-trimethylheptane

 
 

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