What is the most common higher-level examination mistake when adjusting reserves at the admission of a partner?

Correct answer: Distributing the reserve in the new ratio instead of the old ratio

The governing concept is that reserves represent accumulated profits earned before the admission of the new partner. Therefore, they belong entirely to the old partners and must be transferred to their capital or current accounts in the old profit-sharing ratio. The new ratio applies only to profits and losses arising after reconstitution. Hence, distributing the reserve in the new ratio is the common conceptual mistake, so option A is correct. Crediting old partners is normally correct, and an accumulated loss is debited to old partners in the old ratio. Debiting a reserve account is part of the transfer entry, not the mistake itself.