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Which of the below preservative, with their examples correctly match?

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Which of the below preservative, with their examples correctly match?

(a) Type 1 –  DDT

(b) Type 2 – Coal

(c) Type 3 – Boric acid

(d) Type 4 – Benzene

This question was addressed to me during an interview.

I want to ask this question from Defects and Preservation of Timber topic in portion Materials for Construction of Basic Civil Engineering

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The correct answer is (c) Type 3 – Boric acid

The explanation: There are only 3 types of preservative as per IS 401.  Type 1 is oil type and coal, tar are examples of it. Type 2 is an organic solvent type with benzene, DDT as examples.  Type 3 is water borne type and boric acid, zinc chloride are examples of it.

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