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Which of the following statements regarding coal are correct?

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Which of the following statements regarding coal are correct?

(a) Coking coals do not soften on heating

(b) Non coking coals soften on heating

(c) Coke is an oxidizing agent

(d) Coal is a hydrogen deficient hydrocarbon

This question was posed to me in an online interview.

My query is from Natural Products in chapter Natural Products of Chemical Technology

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The correct choice is (d) Coal is a hydrogen deficient hydrocarbon

To elaborate: Coking coals soften and non coking coals do not soften on heating. The product formed during heating of non coking coal is called char. Coke is a reducing agent as it is hydrogen deficient hydrocarbon.

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