Verbal Reasoning - Mental Ability Questions

Find the odd word/letters/number pair from the given alternatives.

A series is given, with one word missing. Choose the correct alternative from the given ones that will complete the series.
nephew, anther, tenses, prunes, preens, ?

If (3)2 @ 1 * 7 = 98 and (4)2 @ 2 * 16 = 178, then (5)2 @ 3 * 9 = ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

FJ, GK, HL, ?, JN

Two airliners start from the same airport. A flies 20 km South. B flies 35 km East, then turns South and flies 45 km, then turns to its right and flies 35 km. Where is B with respect to A now?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

9, 17, 44, 108, 233, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

76, 38, 19, 9.5, ?

If ETHANOL is coded as HWKDQRO, then how will MIX be coded as?