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Which of the following is produced by Novalak – acid system?

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Which of the following is produced by Novalak – acid system?

(a) Ketone

(b) Carboxylic acid

(c) Ester

(d) Aldehyde

The question was asked in an interview.

This interesting question is from Comparative Properties of Gas-Vapour Cured Resin Binders in portion Binder Technology of Casting-Forming-Welding II

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The correct option is (d) Aldehyde

Easy explanation: The novalak – acid system produces formaldehyde, which by the name suggests is an aldehyde and methanol while production of cores.

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