A) \[{{C}_{6}}{{H}_{5}}-CHO\]
B) \[C{{H}_{3}}CHO\]
C) \[HCHO\]
D) All are equally reactive
Correct Answer: C
Solution :
Among carbonyl compounds reactivity decreases with increases in alkyl groups as alkyh groups (\[+I\] effect) decreases positive character on C-atoms. Thus, the correct order of reactivity is: \[HCHO>C{{H}_{3}}CHO>{{C}_{6}}{{H}_{5}}CHO\]
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