Question

Propanal on reaction with dilute sodium hydroxide forms:

• A. $C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}CHO$
• B. $C{{H}_{3}}C{{H}_{2}}CH(OH)C{{H}_{2}}C{{H}_{2}}CHO$
• C. $C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CH(OH)C{{H}_{2}}CHO$
• D. $C{{H}_{3}}C{{H}_{2}}CH(OH)CH(C{{H}_{3}})CHO$

Answer 1

Answer: (D)

$C{{H}_{3}}C{{H}_{2}}CH(OH)CH(C{{H}_{3}})CHO$

Answer 2

Propanal having a-hydrogen atom undergo aldol condensation in presence ofdil. base like $NaOH$ . $C{{H}_{3}}-C{{H}_{2}}CHO+C{{H}_{3}}-\overset{\alpha }{\mathop{C}}\,{{H}_{2}}CHO$ $\xrightarrow[NaOH]{dill.}C{{H}_{3}}-C{{H}_{2}}-\underset{\begin{smallmatrix} | \\\ OH \end{smallmatrix}}{\mathop{CH}}\,-\overset{\begin{smallmatrix} C{{H}_{3}} \\\ | \end{smallmatrix}}{\mathop{CH}}\,-CHO$