Number of optical isomers possible for $2$-chlorobutane is:

The correct statement about the following compounds is:

Ignoring specific markings,which of the following objects are chiral?
$(I)$ $A$ shoe
$(II)$ $A$ book
$(III)$ $A$ pencil
$(IV)$ $A$ pair of shoes (consider the pair as one object)
$(V)$ $A$ pair of scissors

Which of the following compounds is optically active?

The number of stereoisomers of the compound $CH_3CHBrCHBrCOOH$ is

Which of the following molecules with the molecular formula $C_4H_8O$ exhibits optical isomerism?