MCQ
Which of the following is the most stable
- A$1-$butene
- B$2-$butene
- C$1-$pentene
- ✓$2-$pentene
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$I :$ form sets of compounds which display different oxidation states of the metal
$II :$ form coloured ions in solution
$III :$ burn vigorously in oxygen
$IV :$ act as catalyst

