The increasing order of the following compounds towards HCN addition is :
Question:

The increasing order of the following compounds towards HCN addition is :

(1) (i) $<($ iii $)<($ iv $)<($ ii $) \quad$

(2) $\quad$ (iii) $<($ iv $)<($ i $)<($ ii $)$

(3) (iii) $<($ i $)<$ (iv) $<$ (ii) $\quad$

(4) $\quad$ (iii) $<($ iv $)<($ ii $)<($ i $)$


Correct Option: , 3

Solution:

-I effect of $\mathrm{NO}_{2}$ increases reactivity towards nucleophilic addition reaction with $\mathrm{HCN} .-\mathrm{OCH}_{3}$ group is electron donating due to resonance effect which decreases the reactivity towards nucleophillic addition.

 

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