What could we do for a dead person?
There isn’t any verse in the Quran that says to read it to dead people. Even though the tradition is to read the entire Quran (khatm) or read some verses like Yā Sīn, there’s no knowledge in the revelation about this.
The Quran tells us what we can do for a dead person: Pray. Not the entire Quran, but only the verses about forgiveness should be read. Most of these prayers in the Quran are the Rabbana prayers (al-Baqara  201; Ibrahim  41). The 10th verse of the Surah Hashr  is another correct example:
“And those who came after them say: Forgive us and our brethren who were before us in the faith…”
Is there any sense to read these verses to a dead person?
• “To warn whoever is alive…” (Yā Sīn  70).
• “Do you not understand?” (as-Saffat  155).
• “And present to them an example…” (Yā Sīn  13).
• “…Feed the miserable and poor…” (al-Hajj  28).
• “Do not even approach adultery…” (al-Isra  32).
• “…And fight against the disbelievers collectively as they fight against you collectively…” (at-Tawba  36).
• “This is Hell which you were promised!” (Yā Sīn  63).