PL Soni is a well-known author in the field of organic chemistry, and his books are widely used by students and professionals alike. Unfortunately, I couldn't find a direct link to a free PDF of his book. However, I can guide you on how to access his book and provide some useful alternatives:
You're looking for a useful resource on organic chemistry, specifically in PDF format, by PL Soni. Here's what I found: pl soni organic chemistry pdf