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