JEE Main Chemistry question

The compound which contains all four of 1°, 2°, 3° and 4° carbon atoms is

(A)2,3-dimethylpentane
(B)2,2,3-trimethylpentaneCorrect
(C)2,3,4-trimethylpentane
(D)3,3-dimethylpentane

Answer: (B)

Solution

In CH₃–C(CH₃)₂–CH(CH₃)–CH₂–CH₃: the gem-dimethyl carbon (C2) is bonded to four other carbons (quaternary, 4°); C3 is bonded to three carbons (tertiary, 3°); C4 is bonded to two carbons (secondary, 2°); and C1, C5

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Question ID VK-139008