NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- Carboxylic Acid Derivatives
NTA Abhyas 2020 · Chemistry · Carboxylic Acid Derivatives
What represents the best method for converting a carboxylic acid to...
What represents the best method for converting a carboxylic acid to an aldehyde?
Options
- AConvert the acid to an acid chloride, and react the acid chloride with water.
- BReduce the acid with
- CConvert the acid to an acid chloride, and reduce the acid chloride with lithium aluminium tri(t-butoxy) hydride.
- DConvert the acid to an acid chloride, react the acid chloride with a Grignard reagent, and reduce the product with LiAlH4.
Correct answer
C. Convert the acid to an acid chloride, and reduce the acid chloride with lithium aluminium tri(t-butoxy) hydride.
Step-by-step solution
(i) This method will not work
Aldehyde will not form
(ii) Carboxylic acid are not reduced by
(iii) This method is best
RCOOH\overset{SOC{l}_{2} / PC{l}_{3} / PC{l}_{5}}{→}RCOCl\overset{lithiumaluminiumtri \left(t -\text{ butoxy }\right)\text{ hydride }.}{→}RCHO \left(aldehyde\right)RCOOH\overset{SOC{l}_{2} / PC{l}_{3} / PC{l}_{5}}{→}RCOCl\overset{\left(I\right)R^{′}MgBr}{→}RCOR^{′}\overset{LiAl{H}_{4}}{→}{3}^{ο}alcohol
Aldehyde will not form
(ii) Carboxylic acid are not reduced by
(iii) This method is best
RCOOH\overset{SOC{l}_{2} / PC{l}_{3} / PC{l}_{5}}{→}RCOCl\overset{lithiumaluminiumtri \left(t -\text{ butoxy }\right)\text{ hydride }.}{→}RCHO \left(aldehyde\right)RCOOH\overset{SOC{l}_{2} / PC{l}_{3} / PC{l}_{5}}{→}RCOCl\overset{\left(I\right)R^{′}MgBr}{→}RCOR^{′}\overset{LiAl{H}_{4}}{→}{3}^{ο}alcohol