All assets (except cash/bank and fictitious assets) are transferred to which side of which account at the time of dissolution of partnership firm?

Debit side of realisation account

The correct answer is option 1- Debit side of realisation account.

All asset accounts excluding cash, bank and the fictitious assets, if any are closed by transfer to the debit of Realisation Account at their book values. It may be noted that sundry debtors are transferred at gross value and the provision for doubtful debts is transferred to the credit side of Realisation Account along with liabilities. The same thing will apply to fixed assets, if provision for depreciation account is maintained. The following journal entry will be passed for it-
Realisation A/c Dr.
   To Assets (Individually) A/c