The Pentium brand has been relegated to low-cost / budget processors. Creating a processor called the "Pentium 5" would confuse consumers, who now expect a Pentium to be a cheaper processor, while the name would imply that it was a flagship successor to the Pentium 4.
There are version of Intel Pentium one through four as well as Intel Pentium Pro, Intel Pentium D, Intel Pentium M, Pentium (2009), and Pentium Duel Core.
There is no such thing as a Pentium 5. That would be a type of processor, except that Intel stopped naming them Pentium before the Pentium 5 came out.
No. No processor is, or ever has been, marketed as a "Pentium 5."
Intel 8088 Intel 8086 Intel 286 Intel 386 Intel 486 Intel Pentium Intel Pentium II Intel Pentium III Intel Pentium IV Intel Itanium Motorola 6800 Zilog Z80
The Intel Pentium Dual-Core is much faster.
Yes.
No. The Pentium predates the Pentium D by more than a decade.
On the contrary
No, you cannot.
None, other than that you can get a Pentium I computer for about $5.
They are no longer manufactured.
There is no such thing as an "Intel Premium" processor, and the Intel Pentium is 16 years old.