Given below are two statements:

Statement - I: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow $$\mathrm{S}_{\mathrm{N}}{ }^2$$ mechanism.

Statement - II: A secondary alkyl halide when treated with a large excess of ethanol follows $$\mathrm{S}_{\mathrm{N}}{ }^1$$ mechanism.

In the light of the above statements, choose the most appropriate from the options given below:

Example of vinylic halide is :

The final product A, formed in the following multistep reaction sequence is :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : $$\mathrm{CH}_2=\mathrm{CH}-\mathrm{CH}_2-\mathrm{Cl}$$ is an example of allyl halide.

Reason (R) : Allyl halides are the compounds in which the halogen atom is attached to $$\mathrm{sp}^2$$ hybridised carbon atom.

In the light of the above statements, choose the most appropriate answer from the options given below :