Which one of the following reagents is not suitable for the elimination reaction?

Which of the following reagents is suitable for above conversion ?

Which of the following reagent is suitable for the preparation of the product in the above reaction ?

Which one of the following reagents is suitable for the converston of 2-cyclohexenone into 3-methylcyclohexanone ?

Which of the following reaction is an example of elimination reaction :

Which one of the following reagents is used in the Riemer Tiemann reaction?

Which of the reagents is the most suitable for the following reaction ? .