Question 23 of 32intermediate🔧 ApplyShort Answer2 marks

In the alkane H₃C–CH₂–C(CH₃)₂–CH₂–CH(CH₃)₂, identify 1°, 2°, 3° carbon atoms and give the number of H atoms bonded to each one of these.

Correct Answer

1° carbon atoms: The terminal C1C_1 and the three methyl carbons (two attached to C3C_3 and one attached to C5C_5). Each 1° carbon is bonded to 3 H atoms.

2° carbon atoms: C2C_2 and C4C_4. Each 2° carbon is bonded to 2 H atoms.

3° carbon atoms: C5C_5. It is bonded to 1 H atom. (Note: C3C_3 is a 4° carbon attached to four carbon atoms and has 0 H atoms).

Exercise: EXERCISES | Q: 9.14 | (Page Page 33)
For More Understanding

Explanation

Based on the number of carbon atoms attached to a carbon atom, it is classified as primary, secondary, tertiary, or quaternary. In the given structure H₃C–CH₂–C(CH₃)₂–CH₂–CH(CH₃)₂, the terminal C1 and the three branch methyl groups are attached to only one carbon, making them 1° (3 H each). C2 and C4 are attached to two carbons, making them 2° (2 H each). C5 is attached to three carbons, making it 3° (1 H). C3 is attached to four carbons, making it 4° (0 H).

Solution Steps

  1. Step 1: Identify 1° carbons (attached to 1 C): C1, two methyls on C3, one methyl on C5. Each has 3 H atoms.

  2. Step 2: Identify 2° carbons (attached to 2 C): C2 and C4. Each has 2 H atoms.

  3. Step 3: Identify 3° carbons (attached to 3 C): C5. It has 1 H atom. (C3 is 4° with 0 H atoms).

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