ANS:B - causes olefins to combine with iso-paraffins.

Alkylation is a chemical process in which an alkyl group (typically derived from an olefin) is added to another molecule. Here’s how it relates to the options provided:

• Causes olefins to combine with each other: This statement correctly describes alkylation. In alkylation, olefins (such as propylene or butylene) react with an alkylating agent like iso-paraffins (such as iso-butane) to form larger molecules or alkylates.
• Causes olefins to combine with iso-paraffins: This is also correct. Alkylation involves the reaction of olefins with iso-paraffins to produce alkylates.
• Converts iso-paraffin into olefin: This statement is incorrect. Alkylation does not convert iso-paraffins into olefins; instead, it uses iso-paraffins as reactants in combination with olefins.
• Converts olefin into paraffin: This statement is incorrect as well. Alkylation does not convert olefins into paraffins; it involves adding an alkyl group derived from olefins onto other molecules.