Which member in each of the following sets ranks higher?
(a) -Cl or -Br (b) -CH₂Cl or -CHCl₂ (c) -C≡CH or -CH=CH₂
(d) -OH or -NH₂ (e) -CH₂OH or -CH=O (f) -CH₂CH₃ or -CH=CH₂

Question

Which member in each of the following sets ranks higher? (a) -Cl or -Br (b) -CH 2 Cl or -CHCl 2 (c) -C≡CH or -CH=CH 2 (d) -OH or -NH 2 (e) -CH 2 OH or -CH=O (f) -CH 2 CH 3 or -CH=CH 2

TestHub · Accepted Answer

(a) -Br : higher atomic number (35 > 17). (b) -CHCl 2 : the carbon is attached to (Cl, Cl, H) versus (Cl, H, H). (c) -C≡CH : the triply bonded carbon is treated as attached to (C, C, C) versus (C, C, H) for -CH=CH 2 . (d) -OH : O (8) outranks N (7). (e) -CH=O : the doubly bonded oxygen counts twice, (O, O, H) versus (O, H, H). (f) -CH=CH 2 : (C, C, H) versus (C, H, H) for -CH 2 CH 3 . Ans. (a) Br (b) CHCl 2 (c) C≡CH (d) OH (e) CH=O (f) CH=CH 2

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