The Fischer projection formula of the given structure is:

In which of the following molecules is tautomerism possible?

The number of stereoisomers formed in a reaction of $(\pm) Ph(C=O)C(OH)(CN)Ph$ with $HCN$ is $..........$

Identify the correct sequence for True and False.
$(I)$ Only compounds with chiral centers can be optically active.
$(II)$ Absence of elements of symmetry is the reason for a molecule's optical activity.
$(III)$ All organic compounds contain carbon $\&$ hydrogen.
$(IV)$ Different canonical forms of a molecule represent the actual structures of a molecule which has resonance in it.

Identify the conformer of $2$-methylpentane.

Which of the following statements is not correct about the compound $(I)$ shown below?
$(I)$ = $3-$bromocyclopropene