How do i identify whether a reaction is going to be substitution or elimination?

Question

How do i identify whether a reaction is going to be substitution or elimination? My professor frequently gives us a question where we are supplied the substrate / nucleophile and observing what is being reacted, we have to predict the product. In order to do this, you obviously have to first identify whether its a substitution or elimination process. Just looking for some tips or strategy to do this.
Thank you in advance! How do i identify whether a reaction is going to be substitution or elimination? My professor frequently gives us a question where we are supplied the substrate / nucleophile and observing what is being reacted, we have to predict the product. In order to do this, you obviously have to first identify whether its a substitution or elimination process. Just looking for some tips or strategy to do this.
Thank you in advance!
Thank you in advance!

Explanation / Answer

Comparison of alkyli halides:

Primary Alkyhalide: Weak Base - Substitution major

Strong base - elimination Major

Secondary Alkyl Halides : if strong or weak base. Both will give substitution and elimination

Tertiary Alkyl Halides: Major always elimnation, if it is modearate or strong base

Mjaor substition reaction, weak base

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