How many structural isomers are possible for the molecular formula C4H9Br, including both straight and branched chains?
Q1. How many structural isomers are possible for the molecular formula C4H9Br, including both straight and branched chains?
Answer: 4
Explanation: C4H9Br has 4 isomers: n-butyl, isobutyl, sec-butyl, and tert-butyl bromide. Option B misses the branched chain variations possible in butanes.