Dichloroethene cannot exhibit ............

$d-$tartaric acid and $l-$tartaric acid are

Which of the following compounds is chiral?

Which of the following molecules contains stereogenic $C-$ atoms?

Which of the following compounds may not exist as enantiomers?

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 $Br_2/CCl_4$.