Chemistry
Assertion (A): Carboxylic acids react with alcohol in presence of concentrated H2SO4 to produce a fruity smell.
Reason (R): It is due to the formation of an aldehyde.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Organic Chemistry
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Answer
A is true but R is false.
Explanation— Carboxylic acids like ethanoic acid react with alcohol in presence of dehydrating agent, concentrated H2SO4 to produce a ester with pleasant fruity smell. This reaction is know as reaction of esterification. Hence, the assertion (A) is true.
The pleasant fruity smell is due to the formation of ester not aldehyde. Hence, the reason (R) is false.
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Choose the correct word/phrase from within the brackets to complete the following sentences:
(i) The catalyst used for conversion of ethene to ethane is commonly …………… (nickel/iron/cobalt)
(ii) When acetaldehyde is oxidized with acidified potassium dichromate, it forms …………… (ester / ethanol / acetic acid)
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(iv) Write the equation for the reaction taking place between 1,2-dibromoethane and alcoholic potassium hydroxide.
(v) The product formed when ethene gas reacts with water in the presence of sulphuric acid …………… (ethanol / ethanal / ethanoic acid)
From the following organic compounds given below, choose one compound in each case which relates to the description [i] to [iv]:
[Ethyne, ethanol, acetic acid, ethene, methane].
(i) An unsaturated hydrocarbon used for welding purposes.
(ii) An organic compound whose functional group is carboxyl.
(iii) A hydrocarbon which on catalytic hydrogenation gives a saturated hydrocarbon.
(iv) An organic compound used as a thermometric liquid.