A) Schiff s reagent
B) Tollens reagent
C) Grignard reagent
D) Fehling solution
Correct Answer: C
Solution :
Acetaldehyde and acetone react with Grignard reagent. Acetaldehyde gives the secondary alcohol with Grignard reagent while acetone gives tertiary alcohol with Grignard reagent. \[C{{H}_{3}}CHO+RMgX\xrightarrow{{}}C{{H}_{3}}-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{\underset{\begin{smallmatrix} | \\ R \end{smallmatrix}}{\mathop{C}}\,}}\,-OMgX\] But with Schiffs reagent, Tollens reagent, and Fehlings solution only acetaldehyde reacts. (Acetone does not react with these reagents \[RCHO\text{ }+\underset{\left( colourless \right)}{\mathop{Schiffs\text{ }reagent}}\,\xrightarrow{{}}\] pink colour \[R-CHO+\underset{Tollens\text{ }reagent}{\mathop{A{{g}_{2}}O}}\,\xrightarrow{\Delta }\,R.COOH\] \[\underset{silver\text{ }mirror}{\mathop{+2Ag}}\,\] \[R-CHO+\underset{\begin{smallmatrix} blue \\ Fehlings\text{ }solution \end{smallmatrix}}{\mathop{2CuO}}\,\xrightarrow{\Delta }R\,.\,COOH\] \[\underset{red\text{ }ppt.}{\mathop{+C{{u}_{2}}O}}\,\]You need to login to perform this action.
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