Hello Om Prakash.
The error.log file is always a good place to start as it has revealed this
phyrtual wrote:[notice] Parent: child process exited with status 3221225477 -- Restarting.
This is Windows General Protection fault (Hex C0000005) which has been caught by the Windows Kernel and so has many causes and solutions.
In your case this could be a possible path issue that can be easily fixed by copying
these 2 files:libmysql.dll
from the \xampp\php
folder to the \xampp\apache\bin
Then you will need to restart Apache and MySQL servers.
Now try again and see if the issue has been solved.
BTW, the rest of your error.log file entries are correct and are placed there after a successful Apache start.