Question

Which of the aldehyde is most reactive?

• A. $\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } - \mathrm { CHO }$
• B. $\mathrm { CH } _ { 3 } \mathrm { CHO }$
• C.
• D. All the equally reactive

Answer 1

Answer: (C)

Answer 2

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

$\mathrm { HCHO } > \mathrm { CH } _ { 3 } \mathrm { CHO } > \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CHO }$