Identify A and B in the following reaction {CH}₃-{CH}₃ {B}{≤ftarrow} {CH}₃{COOH} {A} {CH}₃{CH}₂{OH}

Correct Answer is : A. LiAlH4{LiAlH}₄LiAlH4 B. HI+redP{HI}+{redP}HI+redP

A. ({HI}+ red {P}) B. {LiAlH}₄

A. {Pd}-{BaSO}₄ B. {Zn}+{HCl}

Correct Answer is : A. LiAlH4{LiAlH}₄LiAlH4 B. HI+redP{HI}+{redP}HI+redP

Test Index

EAMCET Engineering 2008 Solved Paper

Section: Chemistry

Question : 76 of 160

Marks: +1, -0

Identify

A

B

\mathrm{CH}_3-\mathrm{CH}_3 \overset{B}{\leftarrow} \mathrm{CH}_3\mathrm{COOH} \xrightarrow{A} \mathrm{CH}_3\mathrm{CH}_2\mathrm{OH}

Solution:

Acetic acid on reduction with lithium aluminiumhydride

(\mathrm{LiAlH}_4)

gives ethyl alcohol while on reduction with

\mathrm{HI}

and red

\mathrm{P}

gives ethane.

\mathrm{CH}_3\mathrm{COOH} \xrightarrow{\mathrm{LiAlH}_4} \mathrm{CH}_3\mathrm{CH}_2\mathrm{OH}_{\text{ethyl alcohol}}

\mathrm{CH}_3\mathrm{COOH} \xrightarrow{\text{ Red P } + \mathrm{HI}} {\mathrm{CH}_3-\mathrm{CH}_3}_{\text{ ethane }}

Hence, reagent

A

and

B

are respectively

\mathrm{LiAlH}_4

and HI/red P.

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