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What is a Y-shaped 3-carbon group with only single bonds?
Isopropyl
(CH₃)₂CH–
(CH₃)₂ = two CH₃ groups
CH = one more carbon
So 2 + 1 = 3 carbons ✅

What is a straight 4-carbon group with only single bonds?
n-Butyl
CH₃CH₂CH₂CH₂–
CH₃ = 1 carbon
CH₂ + CH₂ + CH₂ = 3 more carbons
1 + 3 = 4 carbons ✅

What is a 4-carbon group attached through carbon #2?
sec-Butyl
CH₃CH(–)CH₂CH₃
Has 4 carbons
The attachment is on carbon #2
4 carbons total ✅

What is a branched 4-carbon group attached through an end carbon?
Isobutyl
(CH₃)₂CHCH₂–
(CH₃)₂ = 2 carbons
CH = 1 carbon
CH₂ = 1 carbon
2 + 1 + 1 = 4 carbons ✅

What is a Y-shaped 4-carbon group where the attachment carbon connects to 3 carbons?
tert-Butyl
(CH₃)₃C–
(CH₃)₃ = 3 carbons
C = 1 more carbon
3 + 1 = 4 carbons ✅
