Per NCERT §9.2.3 + Table 9.2, isomeric pentanes (n-pentane, 2-methylbutane, neopentane) have which boiling-point order?
An-pentane > 2-methylbutane > neopentane
BNeopentane > 2-methylbutane > n-pentane
C2-methylbutane > n-pentane > neopentane
DAll equal
Answer & Solution
Correct answer: A. n-pentane > 2-methylbutane > neopentane
NCERT §9.2.3: more branched → more spherical → less surface contact → lower van der Waals → lower b.p. Linear chain has highest.
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