One short cut way in Fisher projection, is you check whether there is the plane of symmetry, whether plane of symmetry is there not because that is the easiest one to check. Like the top molecule, I can immediately say that it is not a chiral molecule because it has got a plane of symmetry passing through this.
ஒரு எளிய வழிமுறை உள்ளது. ஒரு மூலக்கூறில் சமச்சீர் தளம் இருந்தால் அந்த மூலக்கூறு கைரல் அல்ல.