One mole of alkene $\underline{X}$ on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of $\underline{X}$ is

• Correct answer
  A

  2-methyl-2-butene
• B

  2-methyl-1-butene
• C

  2-butene
• D

  1-butene

Solution

To decide the structure of alkene that undergoes ozonolysis, bring the products together in such a way that $\mathrm{O}$ atoms are face to face, and replace $\mathrm{O}$ by double $(=)$ bond. Thus,

Hence, the correct answer is option: 'A'.