Reduction of carboxylic acids - class-XII

Question 1 Multiple Choice (Single Answer)

$PhCOOH\xrightarrow{DIBALH} $

$PhCHO$
$PhO$
$PhCH _2OH$
None of these

Question 2 Multiple Choice (Single Answer)

How - $COOH$ can be converted into $CH _3$ group?

$\;Na\;\&\;alcohol$
$\;Zn+HCl$
$\;LiAlH _4$
$\;Hl\;\&\;red\;phosphorous$

Question 3 Multiple Choice (Single Answer)

Which of the following reagents can convert acetic acid into ethanol?

$Sn + HCl$
$H _{2} + Pt$
$LiAlH _{4}+$ Ether
$Na +$ Alcohol

Question 4 Multiple Choice (Single Answer)

Which of the following reduces carboxylic acid directly to primary alcohols?

$LiAlH _{4}$
$Na + C _{2}H _{5}OH$
$\text{Lindlar's Catalyst}$
$H _{2}$

Question 5 Multiple Choice (Single Answer)

Which of the following reaction is not the oxidation?

$CH _{3} - CHO \rightarrow CH _{3}COOH$
$C _{2}H _{5}OH \rightarrow CH _{3} - CHO$
$C _{2}H _{5}OH \rightarrow CH _{3} - COOH$
$CH _{3}COOH \rightarrow C _{2}H _{5}OH$

Question 6 Multiple Choice (Single Answer)

$RCOOH \rightarrow RCH _{2}OH$

This mode of reduction of an acid to alcohol can be effected only by

Zn/HCl
Na - alcohol
Aluminium isopropoxide and isopropyl

alcohol
LiAlH$ _{4}$

Question 7 Multiple Choice (Single Answer)

$CH _{3}COOH \xrightarrow[]{LiAlH _{4}}(A)\xrightarrow[H _{2}]{Ni} B$ In this reaction A and B respectively are :

$CH _{3}OH and CH _{4}$
$C _{2}H _{5}OH and C _{2}H _{6}$
$CH _{3}CHO and C _{2}H _{5} OC _{2}H _{5}$
$C _{2}H _{5}OH and CH _{3}OCH _{3}$

Question 8 Multiple Choice (Multiple Answers)

The reagent(s) used for converting ethanoic acid to ethanol is/are :

$LiAlH _{4}$
$BH _{3}$ in $THF$
$PCl _{3}$
$K _{2}Cr _{2}O _{7}/H^{+}$

Question 9 Multiple Choice (Single Answer)

Methyl alcohol when reacted with carbon monoxide using cobalt or rhodium as catalyst , compound $'A'$ is formed. $'A'$ on heating with HI in the presence of red phosphorus as catalyst $'B'$ is formed. $'B'$ is:

$CH _3COOH$
$CH _3CHO$
$CH _3CH _2I$
$CH _3CH _3$

Question 10 Multiple Choice (Single Answer)

Alcohols can be obtained from carboxylic acids by reduction using one of the following reagents:

$LiAIH _{4}$
$N/alcohol$
$Zn/HCl$
$H _{2}/Ni$

Question 11 Multiple Choice (Single Answer)

Which optically active compound on reduction with $\displaystyle LiAlH _{4}$ will give optically inactive compound?

$CH _3-CH(OCH _3)-COOH$
$CH _3-CH _2-CH(OH)-COOH$
$CH _3-CH _2-CH(CH _2OH)-COOH$
$CH _3-CH(OH)-CH _2-COOH$

Question 12 Multiple Choice (Single Answer)

The organic product formed in the reaction. $C _{6}H _{5}COOH \xrightarrow[(II)H _{3}O]{(I)LiAIH _{4}}$?

$C _{6}H _{5}CH _{2}OH$
$C _{6}H _{5}OHCH _{4}$
$C _{6}H _{5}CH _{3} and CH _{3} OH$
$C _{6}H _{5}CH _{3} and CH _{4} $

Question 13 Multiple Choice (Single Answer)

What happens when a carboxylic acid is treated with lithium aluminium hydride?

Aldehyde is formed.
Primary alcohol is formed.
Ketone is formed.
Grignard reagent is formed.

Question 14 Multiple Choice (Multiple Answers)

Consider the following reaction $CH _3-(CH _2) _{14}-COOH \overset{LiAlH _4}{\longrightarrow} ,X \overset{HCl}{\longrightarrow}$
Palmitic acid
$ Y \overset{1., Mg/Et _2O}{\underset{2., Oxirane}{\longrightarrow}} Z \overset{KMnO _4}{\longrightarrow} W$
The correct identity of the compounds is/are :

$X \,is \,CH _3-(CH _2) _{14}-CH _2OH$
$Y\, is \, CH _3-(CH _2) _{14}-CH _2Cl$
$Z \,is\, CH _3-(CH _2) _{16}-CH _2OH$
$W \, is\, CH _3-(CH _2) _{16}-CHO$

Reduction of carboxylic acids - class-XII

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