NTSE Stage 2 SAT 2019 Exam Question Paper

Question : 77 of 100

Marks: +1, -0

An organic compound A on heating with concentrated

H_2SO_4

gave product B and on warming with alkaline

KMnO_4

gave compound C. Compound A on heating with compound C in presence of concentrated

H2SO_4

formedcompound D, which has fruity smell. Identify the compounds A, B, C and D:

A = Alcohol, B = Carboxylic acid,C = Alkene, D = Ester
A = Carboxylic acid, B = Ester, C = Alkene, D = Alcohol
A = Alcohol, B = Alkene, C = Carboxylic acid, D = Ester
A = Alkene, B = Alcohol, C = Ester, D = Carboxylic acid

Validate

Solution:

When ethanol (A) i.e. organic compound reacts with cone

H_2O_4

, it forms ethene (B) along with water. And when ethanol (A) reacts with alk.

KMnO_4

, it will get oxidised to ethanoic acid (C). Ethanol reacts with ethanoic acid to form an ester called ethyl ethanoate (D), which gives a fruity smell.

CH_3CH_2OH{–––––––––––––––>}↖{\Concentrated H_2SO_4}↙{443 \;K{/}Δ}CH_2=CH_2+H_2O

(A) (B)

CH_3CH_2OH+CH_3COOH{––––––––––––>}↙{<––––––––––––––––––––}↖{\Concentrated H_2SO_4}CH_3COOC_2H_2+H_2O

(A) (C) (D)

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