Which of the following is expected to be optically active
${(C{H_3})_4}C$
${C_2}{H_5}CH(C{H_3}){C_3}{H_7}$
${({C_2}{H_5})_2}CHC{H_3}$
$C{H_3}CH = CHC{H_3}$
Among the following, the Newmann projections of meso- $2, 3$ -butanediol are
Which is optically active
The structural formula of sativene is shown below. How many stereogenic centers are there in this molecule ?
How many chiral carbons are there in Reserpine (an antipsychotic drug)?
Which of following compound has center of symmetry?