Is it permissible to dedicate the reward of reciting the Qur'an to the deceased, and does the reward reach them?

There is no validity to the claim that dedicating the reward of reciting the Qur'an to the deceased is disliked. The Sunnah indicates that the reward of good deeds reaches the deceased if performed for their benefit, just as charity, fasting, and supplication reach them.

Whoever performs a deed owns its reward, and whoever owns something has the right to donate it, unless there is an impediment to benefiting from the reward, such as disbelief. Death is not an impediment.

Many imams have held that any act of devotion performed by a Muslim, and its reward dedicated to a living or deceased Muslim, benefits them. This is the madhhab of Imam Ahmad and Imam Abu Hanifa.

One must be cautious not to perform this in a manner that falls into the category of innovation (bid'ah), such such as hiring a reciter, performing it collectively, or singling out a specific person to recite it.

Charity and supplication for the deceased are better than dedicating the reward, to avoid dispute and because it was not the custom of the Salaf for one of them to recite the Qur'an and then dedicate it to the deceased.