There isn’t one car that meets all your requirements, though the Mercedes-Benz E 450 4Matic comes closest. It’s got fantastic rear seats with excellent legroom, though heating and ventilation are missing. 

The six-cylinder petrol engine is also a highlight, delivering great performance with silky refinement. The 4Matic AWD system also adds to confidence and helps you make the most of the power.

If your requirement is to carry five people, then the answer is definitely an SUV. 

While the Mercedes-Benz E Class has one of the best back seats for the money, it is designed to be best for two people and not three. 

The Audi Q7 is a good option, which also gives you the flexibility of a third row of seats. It's got a smooth and refined V6 petrol engine, comfortable air suspension, and though it is a bit old now, the latest update introduced about a year ago means it has most modern creature comforts. 

Bear in mind, however, that it is likely to go a little over your budget of Rs 90 lakh, but if you can manage the stretch, it is definitely the better choice.