Hi Nikhil Aggarwal, In order for a laptop to handle software like AutoCAD smoothly it must have specs like (Intel Core i5, 8GB RAM, 128GB SSD). You can also look at the system requirement for AutoCAD on the official website of Autodesk here:
https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/System-requirements-for-AutoCAD-2018.html
Now when it comes to the laptops, I would recommend you the following:
(a) Acer Aspire E 15
Here are the specs of Acer Aspire E 15:
8th Generation Intel Core i5-8250U Processor (Up to 3.4GHz)
15.6" Full HD (1920 x 1080) widescreen LED-lit IPS Display
8GB Dual Channel Memory & 256GB SSD
Up to 15-hours of battery life.Adapter: 65 W
Windows 10 Home
Amazon's Link: https://www.amazon.com/Acer-Aspire-i5-8250U-GeForce-E5-576G-5762/dp/B075FLBJV7/
(b) Dell Inspiron 15 7000 Series
Here are the specs of Dell Inspiron 15 7000 Series:
Intel Quad-Core i5-7300HQ 2.50 GHz with Turbo Boost Technology up to 3.50 GHz
8GB DDR4 2400MHz Memory,
1TB 5400 rpm Hybrid Hard Drive with 8GB Cache
NVIDIA GeForce GTX 1050 with 4GB GDDR5 Graphics Card
15.6-inch Full HD (1920 x 1080) Anti-Glare LED-Backlit Display
Amazon's Link: https://www.amazon.com/Dell-Inspiron-Gaming-15-6-Inch-Screen/dp/B071JPYP1Z/
In case you want to see the list of top 10 laptops, here's what Google's search result recommends you: https://theconsumerbasket.com/best-laptop-for-architecture/
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Just let me know if you have any doubt, I'm here for you always.