Which member in each of the following sets ranks higher?
(a) –H or –CH₃ (b) –Cl or –CH₂Cl (c) –CH₂CH₂Br or –CH=CH₂
(d) –NHCH₃ or –OCH₃ (e) –CH₂OH or –CH=O (f) –CH₂OCH₃ or –CH=O

Question

Which member in each of the following sets ranks higher?

(a) –H or –CH₃ (b) –Cl or –CH₂Cl (c) –CH₂CH₂Br or –CH=CH₂

(d) –NHCH₃ or –OCH₃ (e) –CH₂OH or –CH=O (f) –CH₂OCH₃ or –CH=O

TestHub · Accepted Answer

(a) –CH₃ : the first atom C (6) outranks H (1).

(b) –Cl : the first atom Cl (17) outranks C (6).

(c) –CH=CH₂ : its first carbon is treated as bonded to (C, C, H), while that of –CH₂CH₂Br is (C, H, H).

(d) –OCH₃ : the first atom O (8) outranks N (7).

(e) –CH=O : the double bond makes its carbon (O, O, H), which beats the (O, H, H) of –CH₂OH.

(f) –CH=O : its carbon is (O, O, H), while that of –CH₂OCH₃ is (O, H, H).

Ans. (a) –CH₃ (b) –Cl (c) –CH=CH₂ (d) –OCH₃ (e) –CH=O (f) –CH=O

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