Which one of the following molecules does not show stereo isomerism?
$3,4 -$dimethylhex$-3-$ene
$4-$Methylhex$-1-$ene
$3-$Methylhex$-1-$ene
$3-$Ethylhex$-3-$ene
Total number of secondary amines (Excluding stereo isomer) possible with the molecular formula $C_5H_{13}N$ is
Which of the following structure is not meso- $2,3$ -butanediol ?
Which of the following pair are metamer ?
Correct configuration of the following is