Among the structures given, select the enantiomers.

Which of the following molecules is/are chiral?

An alkene with the molecular formula $C_4H_8$ does not exhibit which of the following?

In the reaction sequence shown below,determine the total number of stereoisomers formed as the final product $D$. The starting material is $CH_3-CD(CH_3)-C \equiv C-CO-CH_3$. The reaction $A$ is $LiAlH_4$ (or similar reducing agent to reduce the alkyne to a cis-alkene),$C$ is the cis-isomer,and the final step is the addition of $Br_2/CCl_4$.

Which of the following compounds is an optically active substance with a low molecular weight?

Why is $Meso-tartaric$ acid optically inactive?