When a trough of one wave overlaps the crest of another wave spots are produced. PLEASE HELP

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Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?