Which halide forms CH₃CH₂CH₂CH₂CH₃ when treated with Mg in ether followed by H₂O ?
CH₃CH₂CH₂CH₂Br forms a Grignard reagent ( CH₃CH₂CH₂CH₂MgBr ), which hydrolyzes to pentane ( CH₃CH₂CH₂CH₂CH₃ ).
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Elimination Reactions and Reaction with Metals and Other Reactions