What is the product formed when $1$-bromo-$3$-chlorocyclobutane reacts with $2$ moles of sodium in ether?

Which of the following compounds will not produce a precipitate on reaction with $AgNO_3$?

Increasing the concentration of an electrophile (substrate) in a typical $S_N2$ reaction by a factor of $3$ and the concentration of the nucleophile by a factor of $3$ will change the reaction rate to

Indicate the correct order of bond energy for the following.

Heterolytic bond dissociation energy of alkyl halides follows the sequence:

The main product of the reaction between alcoholic silver nitrite $(AgNO_2)$ and ethyl bromide $(C_2H_5Br)$ is: