This problem includes conceptual mixing of diazotisation and rearrangement of carbocation. To solve these problems, students are advised to complete the reaction by using appropriate mechanism and correct route of chemical reaction. Do the diazotisation first, then generate carbocation followed by rearrangement.
Diazotisation : This process of diazotisation in organic compound containing NH₂ group is done by using HNO₂ as a reagent, which is believed to be occurs as follows



This reaction completes through formation of carbocation which undergo rearrangement to give more stable carbocation.