Nmdcat Practice Paper from PMDC Syllabus | mosaicbro.com

Nmdcat Practice Paper from PMDC Syllabus

7 of 197 questions (Page 18 of 29)

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120 Which of the following reaction is used for the separation and purification of carbonyl compounds from non-carbonyl compounds?
Correct Answer: C
Explanation: Sodium bisulphite is used to separate and purify carbonyl compounds.
121 Tollen's reagent is:
Correct Answer: C
Explanation: Tollen's reagent is an ammoniacal solution of silver nitrate (AgNO₃).
122 The class of compounds that are reduced to primary alcohols and respond to Fehling's solution are known as:
Correct Answer: C
Explanation: Aliphatic aldehydes are reduced to primary alcohols and react with Fehling's solution.
123 Ketones on oxidation produce acids of:
Correct Answer: A
Explanation: Ketones oxidize to form carboxylic acids with fewer carbon atoms than the parent compound.
124 One of the following compounds does not have α-hydrogen. Which is that?
Correct Answer: C
Explanation: Formaldehyde (HCHO) lacks α-hydrogen atoms.
125 Why acetaldehyde formed in liquid (in laboratory method) is immediately distilled off?
Correct Answer: A
Explanation: Distilling acetaldehyde immediately prevents its oxidation.
126 The clear fact for structural difference between and aldehyde and a ketone is:
Correct Answer: C
Explanation: Aldehydes have one R group or H on the carbonyl carbon, while ketones have two R groups.
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