Question 1

Kya chirality ke liye stereocenter zaroori hai?

Accepted Answer

Nahi. Chirality ki asli definition hai: molecule mein koi plane of symmetry nahi hona chahiye. Stereocenter (4 alag groups wala sp³ carbon) us condition ko poora karne ka sabse common tareeka hai, definition nahi. Meso compounds mein 2 stereocenters hote hain phir bhi wo achiral hote hain, kyunki andar ek internal plane bacha reh jaata hai.

Question 2

sp² carbon stereocenter kyun nahi ho sakta?

Accepted Answer

sp² carbon planar hota hai — uske teen groups aur khud carbon, sab ek hi plane mein baithe hote hain. Wahi molecular plane ek plane of symmetry ban jaata hai, isliye us carbon pe chirality possible hi nahi. NEET aksar planar sp² centre dikha ke poochta hai 'optically active hai?' — jawab hamesha nahi.

Question 3

Enantiomers mein kya farak hota hai?

Accepted Answer

Enantiomers non-superimposable mirror images hote hain. Unke melting point, boiling point, density — sab same hote hain. Farak sirf do jagah aata hai: plane-polarized light ko wo barabar magnitude par opposite direction mein ghumate hain (+ aur −), aur chiral environment (jaise enzymes) ke saath alag react karte hain.

Question 4

Exam mein chirality check karne ka fastest tareeka kya hai?

Accepted Answer

Pehle plane of symmetry dhundo, groups gino baad mein. Agar ek bhi plane mil gaya to molecule achiral hai — aage sochne ki zaroorat nahi. Plane nahi mila, tabhi stereocenter count karo. Ye order ulta karne se hi students meso compounds waale trap mein phaste hain.

Chirality — The Mirror Test in 3D

Practice

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