The interval from a flat (B♭) to a double flat (B♭♭) is a whole tone or major second. In terms of half steps, this interval consists of two half steps: from B♭ to B♭♭. Essentially, a double flat lowers the note by two half steps, creating this interval.
the interval is a 3rd.
The interval from B-flat to D is a major third, regardless of the key.
The interval from A to Bb is a minor 2nd, also called a half step.
Minor 7th
The interval from C to A flat is a minor sixth. In terms of half steps, it spans eight half steps, which is characteristic of a minor sixth interval. This interval can also be described as an augmented fifth when considering the relationship between the notes in a different context.
I think it would be a minor second. D flat to D double flat would be the equivalent of D flat to C.
A C to a G would be a perfect fifth. Because the interval was decreased by 2 half-steps (by sharping the C and flatting the G), the interval C sharp to G flat is a double-diminished 5th.
the interval is a 3rd.
a
E flat consists of 3 flats, B flat, E flat and A flat. E flat to B flat would be a perfect 5th interval as B flat is in E flat major, but because your question was E flat to B, B is a semitone up from B flat, this would mean the interval becomes a semitone larger, and a semitone larger from a perfect interval is augmented. Therefore, the answer to your question is an augmented 5th. Hope this helps :)
The interval from B-flat to D is a major third, regardless of the key.
augmented 5th, as e flat to b flat is a perfect 5th and b is a semitone above b flat, making the interval augmented
Double Interval, MARCH
Normal interval, close interval, and double interval
The interval from A to Bb is a minor 2nd, also called a half step.
normal interval, close interval, and double interval
Normal interval, close interval, and double interval