One of the following cannot be prepared by Kolbe's electrolytic process?

Kolbe's electrolytic synthesis.

How ethane is prepared by Kolbe's electrolysis.

Which of the following alkanes cannot be produced by Kolbe's electrolysis of sodium or potassium salts of carboxylic acids ?

Which of the following alkanes cannot be produced by Kolbe's electrolysis of sodium or potassium salts fo carboxylic acids ?

Which alkane cannot be prepared by Kolbe's method ?