Which scientific term is used for a convenient category for the study of organisms like fish and mammals?

$A$ transformer works on the principle of

Two bodies have their moments of inertia $I$ and $2I$ respectively about their axis of rotation. If their kinetic energies of rotation are equal,their angular momenta will be in the ratio

If all the seven letters of the word $LEADING$ are permuted in all possible ways and the words thus formed are arranged as in the dictionary order,then the word in $2017^{\text{th}}$ place is

Which of the following compounds is not chiral?

Product $(A)$ is