Aldehydes and Ketones - Result Question 21

####21. The order of reactivity of phenyl magnesium bromide with the following compounds is

(2004,1M)

(I)

(II)

(III) (a) (II) > (III) > (I)

(b) (I) > (III) > (II)

(c) (II) > (I) > (III)

(d) All of the above

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Answer:

Correct Answer: 21. (a)

Solution:

  1. The reactivity of carbonyl compound towards nucleophilic addition of Grignard’s reagent depends on extent of steric hindrance at α-carbon. Greater the steric hindrance smaller the reactivity. Hence, reactivity order is

CH3CHO II >CH3COCH3 I >PhCO III Ph



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