Which of the following statement is wrong?

• In compression ignition engines, detonation occurs near the beginning of combustion.
• Since the fuel, in compression ignition engines, is injected at the end of compression stroke, therefore, there will be no pre-ignition.
• To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.
• In compression ignition engines, because of hetrogeneous mixture, the rate of pressure rise is comparatively lower.