How many chiral centers (excluding $N$ centers) are there in morphine?

In a mixture,two enantiomers are found to be present in $85 \%$ and $15 \%$ respectively. The enantiomeric excess $(ee)$ is (in $\%$)

The specific rotation of $(+)$-Mandelic acid is $+158^o$. What will be the specific rotation of a mixture containing $25\%$ $(-)$-Mandelic acid and $75\%$ $(+)$-Mandelic acid?

What is a substance called that can rotate the plane of plane-polarized light?

Identify the chiral molecule among the following.

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