Which of the following has maximum nucleophilicity?

Compare the melting point $\left(\mathrm{MP}\right)$ and dipole moment ($\mu$) of the above compounds:

Which of the following isomers are not a pair of enantiomers:

Which of the following compound is optically inactive:

The correct statement about the compoud $\left(\mathrm{A}\right), \left(\mathrm{B}\right)$ and $\left(\mathrm{C}\right)$ is: