Which of the following are pseudo first order under the conditions stated? Select the correct option(s).

1. AHydrolysis of an ester in a large excess of water in the presence of a dilute acid catalyst
2. BInversion of sucrose in dilute aqueous acid
3. CDecomposition of $\mathrm{N}{}_2\mathrm{O}{}_5$, which is intrinsically unimolecular
4. D$\mathrm{A}+\mathrm{B}\to \mathrm{P}$ with rate $=k[\mathrm{A}][\mathrm{B}]$ when $[\mathrm{B}{]}_0=100[\mathrm{A}{]}_0$