Hi,
No, it is not possible currently in case of 5 year Dual Degree Courses to leave college with a BTECH degree of 4 year. However if it was the other way round, where you were doing 4 year Btech and wanted to convert to Dual Degree then you could do that. But for you question, No you cannot leave a 5 year integrated degree with btech degree only.
I hope this helps,
All the best
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