Q.

The correct order of priority of groups -SCH3 (I), -NO2 (II), -CCH (III) and -CH2C6H5 (IV), on the basis of CIP classification, is (increasing order) :

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a

II, IV, I, III

b

IV, III, II, I

c

III, IV, II, I

d

I, III, II, IV

answer is B.

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Detailed Solution

Follow CIP rules, we know that Atomic number is given more preference.

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The correct order of priority of groups -SCH3 (I), -NO2 (II), -C≡CH (III) and -CH2C6H5 (IV), on the basis of CIP classification, is (increasing order) :