Question

Why there is one maxima for diffraction and two maxima for interference for the same angle?

Answer 1

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Most of the light is concentrated in the broad CENTRAL DIFFRACTION MAXIMUM. ... note that the width of the central diffraction maximum is inversely proportional to the width of the slit. If we increase the width size, a, the angle T at which the intensity first becomes zero decreases, resulting in a narrower central band.
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Answer 2

☆$\red {HELLO\:DEAR}$☆

Interference'' is the more general concept: it refers to the phenemenon of waves interacting. Waves will add constructively or destructively according to their phase difference.

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