JEE Main · 2010 · 11 Apr 2010 · Offline · Hydrocarbons

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One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u . The alkene is

(A)propene
(B)1-butene
(C)2-butene✓ Correct
(D)ethene

Answer: (C)

Solution

Ozonolysis cleaves the double bond and caps each of its carbons with an oxygen. A symmetrical alkene gives two identical carbonyl fragments, and here each is an aldehyde of molar mass

44

, which is acetaldehyde

C H_{3} CHO

. Rebuilding the alkene by rejoining two

C H_{3} CHO

units at their carbonyl carbons gives

C H_{3} CH = CHC H_{3}

, which is 2-butene.

JEE Main · 2010 · 11 Apr 2010 · Offline · Single correct option

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