Tag: chemical properties

Questions Related to chemical properties

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

chemistry alcohols, esters and carboxylic acids reduction of carboxylic acids chemical properties chemical properties of carboxylic acids

  1. $CH _3-CH(OCH _3)-COOH$

  2. $CH _3-CH _2-CH(OH)-COOH$

  3. $CH _3-CH _2-CH(CH _2OH)-COOH$

  4. $CH _3-CH(OH)-CH _2-COOH$

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Correct Option: C

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

chemistry alcohols, esters and carboxylic acids reduction of carboxylic acids chemical properties chemical properties of carboxylic acids

  1. $C _{6}H _{5}CH _{2}OH$

  2. $C _{6}H _{5}OHCH _{4}$

  3. $C _{6}H _{5}CH _{3} and CH _{3} OH$

  4. $C _{6}H _{5}CH _{3} and CH _{4} $

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Correct Option: A
Explanation:

using LAH (lithium aluminium hydride), the COOH group is reduced to  $ CH _{2} OH$  group

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

chemistry alcohols, esters and carboxylic acids reduction of carboxylic acids chemical properties chemical properties of carboxylic acids

  1. Aldehyde is formed.

  2. Primary alcohol is formed.

  3. Ketone is formed.

  4. Grignard reagent is formed.

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Correct Option: B
Explanation:

$RCOOH + 4H \xrightarrow{LiAlH _4}RCH _2OH+H _2O$

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 :

chemistry alcohols, esters and carboxylic acids reduction of carboxylic acids chemical properties chemical properties of carboxylic acids

  1. $X \,is \,CH _3-(CH _2) _{14}-CH _2OH$

  2. $Y\, is \, CH _3-(CH _2) _{14}-CH _2Cl$

  3. $Z \,is\, CH _3-(CH _2) _{16}-CH _2OH$

  4. $W \, is\, CH _3-(CH _2) _{16}-CHO$

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Correct Option: A,B,C
Explanation:

Reaction:
$CH _3-(CH _2) _{14}-COOH \overset{LiAlH _4}{\longrightarrow} \,CH _3-(CH _2) _{14}-CH _2OH \overset{HCl}{\longrightarrow} CH _3-(CH _2) _{14}-CH _2Cl$
$ CH _3-(CH _2) _{14}-CH _2Cl \overset{1.\, Mg/Et _2O}{\underset{2.\, Oxirane}{\longrightarrow}} CH _3-(CH _2) _{16}-CH _2OH \overset{KMnO _4}{\longrightarrow} CH _3-(CH _2) _{16}-COOH$