Question:
Which of the following is NOT true for cashew nut shell liquid?
Which of the following is NOT true for cashew nut shell liquid?
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CNSL is a highly prized source of natural "Cardanol," which is a monohydric phenol. This structural characteristic makes it highly reactive for polymerization (useful in resins and brake pads) but chemically distinct from water-soluble tannins.
Updated On: Aug 7, 2026
- Naturally occurring phenol
- Used in formulation of resins, detergents, insecticides and dyes
- It is obtained during processing of nuts in isolation of kernels
- Naturally occurring tannins
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Cashew Nut Shell Liquid (CNSL) is a dark-brown, viscous byproduct obtained during the processing of cashew nuts (Anacardium occidentale).
It is contained within the pericarp (shell) of the cashew nut and is extracted during decortication to isolate the edible kernel.
Step 2: Detailed Explanation:
Let us evaluate each option based on the chemical and industrial properties of CNSL:
Naturally occurring phenol: CNSL is composed of anacardic acid (about 70% in cold-extracted liquid), cardol, cardanol, and methylcardol.
All of these components contain a phenolic ring with a long unsaturated hydrocarbon side chain, making CNSL a major source of naturally occurring phenols. Thus, statement (A) is true.
Industrial Applications: Due to its unique chemical structure (phenolic ring plus an aliphatic chain), it undergoes various polymerisation reactions.
It is used in manufacturing brake linings, laminating resins, specialty varnishes, detergents, eco-friendly insecticides, paints, and dyestuffs. Thus, statement (B) is true.
Extraction Process: CNSL is released during the roasting or oil-bath extraction process of cashew processing, which aims to separate the valuable kernels without contamination. Thus, statement (C) is true.
Naturally occurring tannins: Tannins are high-molecular-weight polyphenolic compounds that precipitate proteins and are completely different from the long-chain monohydric or dihydric phenols found in CNSL.
CNSL does not possess tannin properties or structure. Therefore, statement (D) is not true.
Step 3: Final Answer:
Because CNSL is a phenolic lipid rather than a tannin, statement (D) is the incorrect property and the correct answer.
Cashew Nut Shell Liquid (CNSL) is a dark-brown, viscous byproduct obtained during the processing of cashew nuts (Anacardium occidentale).
It is contained within the pericarp (shell) of the cashew nut and is extracted during decortication to isolate the edible kernel.
Step 2: Detailed Explanation:
Let us evaluate each option based on the chemical and industrial properties of CNSL:
Naturally occurring phenol: CNSL is composed of anacardic acid (about 70% in cold-extracted liquid), cardol, cardanol, and methylcardol.
All of these components contain a phenolic ring with a long unsaturated hydrocarbon side chain, making CNSL a major source of naturally occurring phenols. Thus, statement (A) is true.
Industrial Applications: Due to its unique chemical structure (phenolic ring plus an aliphatic chain), it undergoes various polymerisation reactions.
It is used in manufacturing brake linings, laminating resins, specialty varnishes, detergents, eco-friendly insecticides, paints, and dyestuffs. Thus, statement (B) is true.
Extraction Process: CNSL is released during the roasting or oil-bath extraction process of cashew processing, which aims to separate the valuable kernels without contamination. Thus, statement (C) is true.
Naturally occurring tannins: Tannins are high-molecular-weight polyphenolic compounds that precipitate proteins and are completely different from the long-chain monohydric or dihydric phenols found in CNSL.
CNSL does not possess tannin properties or structure. Therefore, statement (D) is not true.
Step 3: Final Answer:
Because CNSL is a phenolic lipid rather than a tannin, statement (D) is the incorrect property and the correct answer.
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