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Which of the following coals have high rates of carbonisation?

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Which of the following coals have high rates of carbonisation?

(a) Non-caking coal

(b) Caking coal

(c) Coking coal

(d) Non-coking coal

The question was posed to me in an interview for job.

Asked question is from Secondary Solid Fuels topic in chapter Fuels and Combustion of Engineering Chemistry II

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The correct answer is (a) Non-caking coal

The best explanation: Caking coal form a plastic zone which acts as a heat barrier. Non-caking coal does not forms this plastic material due to which it has high rates of carbonisation. Coking coals are formed by caking coals.

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