Question

how to find optically active compound​

Answer 1

As simple as that. Now, if it's unsymmetrical then check for chiral or asymmetric carbon atoms(carbons attached to four different groups). If it contains chiral carbons then its optically active. The final and the most important test is that the molecule should be non-superimposable on its mirror image

Answer 2

to find optically active compounds

1) first, find no. of chiral carbons in the given compound

2) make mirror image of compound if it isn't superimposable on each other then they are enantiomer pairs

enantiomers are pairs of optically active compound of same molecular formula which form d and l pairs

Hope it helps