If all the persons are made to sit in alphabetical order from left to right, the positions of how many will remain unchanged as compared to the original seating positions?

Given that

H sits third to the left of P. So possible cases are

H _ _ P _ _

_ H _ _ P _

_ _ H _ _ P

Now it is given that ,P does not sit at an extreme end of the line and Only one person sits between M and K. and K is not the immediate neighbour of H, So possible cases are:

H _ K P M _

H _ M P K _

_ H _ K P M

_ H _ M P K

Now it is given that ,J is not an immediate neighbour of H or M. So,

H L M P K J - Only possible arrangement

Initial Arrangement - H L M P K J

Alphabetical Order- H J K L M P