Dehydration of 2, 2, 3, 4, 4-pentamethyl-3-pentanol gave two alkenes A and B. Ozonolysis of the lower

Question:

Dehydration of 2, 2, 3, 4, 4-pentamethyl-3-pentanol gave two alkenes A and B. Ozonolysis of the lower boiling alkene A gave formaldehyde (CH2 = O) and 2, 2, 4, 4-tetramethyl-3-pentanone. Ozonolysis of B gave formaldehyde and 3, 3, 4, 4-tetramethyl-2-pentanone. Identify A and B, and suggest an explanation for the formation of B in the dehydration reaction.