Is this road trip from India to Singapore covering entire South-East Asia in the below mentioned route were possible? [closed]

In theory, yes it is possible to drive through those countries in that order.

I did a quick search using Google Maps and that route covers all the countries on your list...

It is worth noting that this trip is over 9000KM long and would take over a week of none stop driving. If you limit yourself to 6 hours driving per day then it would take approximately a month of traveling.

This is all according to Google Maps and does not consider the type or quality of the roads nor does it consider any political restrictions.

What you should do if you want to plan such a trip is to first see what Visa requirements you need to enter each country then research border crossings, there are some unfriendly borders in that region of the world so the most straight forward route might not be possible.

Depending on your nationality, you might need a visa for some of the countries in that list.

Also, countries like Nepal or Bhutan are not easily accessible by road due to their mountainous nature, especially if you are a foreigner.