Klein:
The textbook I recommend for sophomore organic chemistry in the US is Organic Chemistry, 3rd Edition, by Klein: https://amzn.to/2QGd7aB
This comes with two popular summaries, Organic Chemistry as a Second Language: 5th Edition: First Semester Topics: https://amzn.to/2EtAhyg Second Semester Topics: https://amzn.to/31wW29d
Many students also buy a modeling kit, such as Molecular Visions (Organic, Inorganic, Organometallic) Molecular Model Kit #1 by Darling Models to accompany Organic Chemistry 4th Edition: https://amzn.to/3gvAON5
Another popular text is Organic Chemistry 009 Edition, McMurry: https://amzn.to/3gmYTpe
For organic chemistry taught with little emphasis on biological systems, an excellent book is Organic Chemistry 2nd Edition by Clayden, Greeves, and Warren.
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