The textbook by Ivan Novoshinskii and Nina Novoshinskaya is available online in several formats.
If you are looking for help with exercises, "Ready Homework" (GDZ) sites provide step-by-step solutions:
You can read the 10th-grade textbook (Advanced Level) page by page on CoolLib . novoshinskii organicheskaia khimiia 10 klass onlain
Depending on whether you need to read the full text or check answers, you can use the following resources: 📖 Read or Download the Textbook
Offers detailed answers for the 10th-grade curriculum on MegaResheba.ru . The textbook by Ivan Novoshinskii and Nina Novoshinskaya
The textbook is also hosted on ibooks.ru for authorized educational users. ✍️ Solutions and GDZ
Provides online solutions for the 2015 edition and newer on GDZ.ru . The textbook is also hosted on ibooks
Sites like 11klasov.net and community groups on VK offer PDF and DJVU versions of both the Basic and Advanced (Profile) levels.