The correct priorities for the substituents shown below, according to the E-Z sequence rule is
I. – CN
II. -CBr(CH3)2
III. -COOH
IV. \(-CH_2 -{\overset{O}{\overset{||}{C}}}-OCH_3\)
V. \(-{\overset{O}{\overset{||}{C}}}-H\)
(a) II, III, V, I, IV
(b) V, II, I, IV, III
(c) III, IV, I, II, V
(d) II, V, I, IV, III
Correct answer: (a) II, III, V, I, IV
Explanation:
(a) (i) \(-\overset{N}{\overset{|}{\underset{N}{\underset{|}{C}}}} - \overset{C}{\overset{|}{\underset{C}{\underset{|}{N}}}}\)
(ii) \(-\overset{CH_3}{\overset{|}{\underset{Br}{\underset{|}{C}}}} - CH_3\)
(iii) \(-\overset{OH}{\overset{|}{\underset{C-O}{\underset{|}{C}}}} - {\underset{C}{\underset{|}{O}}}\)
(iv) \(-\overset{H}{\overset{|}{\underset{H}{\underset{|}{C}}}} - \overset{O}{\overset{|}{\underset{O -C}{\underset{|}{C}}}} - OCH_3\)
(v) \(-\overset{O-C}{\overset{|}{\underset{H}{\underset{|}{C}}}} - {\underset{C}{\underset{|}{O}}}\)
Arrange (NNN), (BrCC), (OOO), (CHH), (OOH) in increasing atomic number. The order is ii, iii, v, i, iv.