Which of the following statements are correct?<br> 1. Order of a reaction can be known from experimental result and not from the stoichiometry of reaction<br> 2. Overall molecularity of a reaction may be determined in a manner similar to overall order of reaction<br> 3. Overall order of reaction,<br> ${A^m} + {B^n} \to A{B_x}\;is\;\left( {m + n} \right)$<br> 4. Molecularity of a reaction refers to<br> (i) Molecularity of each of the elementary steps (slow steps) in a multistep reaction<br> (ii) Molecularity of that particular step in a single step reaction<br> Select the correct answer by using the codes given below