Question

in the structure of 2,3,3 - trimethylpentane, identify the primary (p), secondary (s), tertiary(t), and quaternary (q) carbons.

Explanation:

1. Primary (p) carbons: Bonded to only 1 other carbon; these are all the end (terminal) methyl carbons. There are 5 of these.
2. Secondary (s) carbon: Bonded to 2 other carbons; this is the CH₂ carbon on the right side of the main chain. There is 1 of these.
3. Tertiary (t) carbon: Bonded to 3 other carbons; this is the CH carbon on the left side of the main chain (carbon 2). There is 1 of these.
4. Quaternary (q) carbon: Bonded to 4 other carbons; this is the central carbon with four carbon branches (carbon 3). There is 1 of these.

To map to the structure:

• The 5 terminal (outermost) empty boxes = p
• The CH₂ box (right side, middle chain) = s
• The CH box (left side, connected to 3 carbons) = t
• The central box connected to 4 carbons = q

Answer:

• 5 terminal carbons: p
• Central 4-bonded carbon: q
• CH carbon (left middle): t
• CH₂ carbon (right middle): s