1.
The major product of the following reaction is:

CH3CH2CH2CH2COCH3(i) NaOBr, (ii) H3O+,(iii) Red P, Br2,(iv) H2O\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{COCH}_3 \xrightarrow{\text{(i) NaOBr, (ii) H}_3\text{O}^+, \text{(iii) Red P, Br}_2, \text{(iv) H}_2\text{O}}