`SN^(1)` and `SN^(2)` mechanisms

Which of the following compounds gives SN^(1), SN^(2) and SN^(2) mechanisms?

Explain the factors affecting SN_(1) and SN_(2) mechanism.

SN2 Mechanism

The rate of SN^2 reaction depends on the effectiveness of the nucleophile in ejecting the leaving group. Nucleophilicity is the affinity for C atom, while basicity is the affinity for proton. In both cases, a new bond is formed. If a new bond is formed between the anion and proton, the specied acts as a base. If a new bond is formed between the anion and C atom, the species acts as nucleophile. Which of the following compounds gives SN^1, SN^2 , and SN^2 mechanisms ?

The rate of SN^2 reaction depends on the effectiveness of the nucleophile in ejecting the leaving group. Nucleophilicity is the affinity for C atom, while basicity is the affinity for proton. In both cases, a new bond is formed. If a new bond is formed between the anion and proton, the specied acts as a base. If a new bond is formed between the anion and C atom, the species acts as nucleophile. Which of the following compounds gives SN^1, SN^2 , and SN^2 mechanisms ?

a. Given the major products formed by heating the following ethers with conc. HI with metioning SN^(-1) or SN^(-2) mechanism. i. (1- Propoxy propane) ii. Ph--O--Me (Methoxy benzene) iii. Ph--CH_(2)--O--Et (benzyl ethyl ether) iv. (1-Ethoxy-2-methyl butane) v. (2-Propoxy-2-methyl butane) vi. PhCH_(2)OPh (Benzyl phenyl ether) vii. (Tetrahydrofuran, THF) b. Given the products of the above ethers with excess of HI. c. Why does SN^(-2) cleavage occur at a faster rate with HI than with HCI ?

Explain SN^2 mechanism ?