Nmdcat Practice Paper from PMDC Syllabus | mosaicbro.com

Nmdcat Practice Paper from PMDC Syllabus

7 of 197 questions (Page 13 of 29)

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85 According to I.U.P.A.C system aldehydes are:
Correct Answer: B
Explanation: IUPAC names for aldehydes use the suffix '-al' (e.g., ethanal for acetaldehyde).
86 Which of the following reagents will react with both aldehyde and ketones?
Correct Answer: A
Explanation: Grignard reagents (RMgX) add to both aldehydes and ketones to form alcohols.
87 What is the product when an aldehyde is reduced with LiAlH₄?
Correct Answer: B
Explanation: LiAlH₄ reduces aldehydes to primary alcohols (R-CHO → R-CH₂OH).
88 In the reaction of a ketone with hydrazine (NH₂NH₂) under basic conditions, the major product is:
Correct Answer: D
Explanation: Hydrazine reacts with ketones to form hydrazones (R₂C=NNH₂).
89 Carboxylic acids react with alcohols in the presence of concentrated sulfuric acid to form:
Correct Answer: C
Explanation: Fischer esterification: RCOOH + R'OH → RCOOR' (ester) + H₂O (H₂SO₄ catalyst).
90 Which of the following acids is the strongest?
Correct Answer: A
Explanation: Formic acid (HCOOH) is stronger due to the electron-withdrawing effect of the H atom (no alkyl group).
91 Which of the following will react with sodium carbonate to produce carbon dioxide gas?
Correct Answer: C
Explanation: Carboxylic acids (RCOOH) release CO₂ when reacted with Na₂CO₃ (e.g., 2CH₃COOH + Na₂CO₃ → 2CH₃COONa + CO₂ + H₂O).
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