Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : In T l I 3 , isomorphous to CsI 3 , the metal is present in + 1 oxidation state. Reason R : T l metal has fourteen f electrons in its electronic configuration. In the light of the above statements, choose the most appropriate answer from the options given below:

Step-by-step solution

T ℓ I 3   ⇒   T ℓ ⊕   &   I 3 ⊝ CsI 3   ⇒   Cs ⊕   &   I 3 ⊝ [Both have same crystalline structure is called isomorphous] T ℓ 81 ⊕ = Xe 54 4 f 14 ,   5   d 10 ,   6   s 2 (It is correct due to present 14 f electrons in Tℓ ⊕ ion) T l I 3 is T ℓ + I 3 - CSI 3 is Cs + I 3 - Thallium shows T ℓ + state due to inert pair effect.