Given below are two statements:

Statement I : Aqueous solution of K$$_2$$Cr$$_2$$O$$_7$$ is preferred as a primary standard in volumetric analysis over Na$$_2$$Cr$$_2$$O$$_7$$ aqueous solution.

Statement II : K$$_2$$Cr$$_2$$O$$_7$$ has a higher solubility in water than Na$$_2$$Cr$$_2$$O$$_7$$.

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

Suitable reaction condition for preparation of Methyl phenyl ether is

Identify the correct order of reactivity for the following pairs towards the respective mechanism

Choose the correct answer from the options given below:

The pair from the following pairs having both compounds with net non-zero dipole moment is