110, MWV Q 16, for piano, violin, two violas, cello, and double bass was composed in April–May 1824, when Mendelssohn was only 15, the same time he was working on a comic opera Die Hochzeit des Camacho.
Its first edition was issued in 1868 as a part of a complete collection of Mendelssohn's works, hence the misleadingly high opus number.
The composer's autograph of the score (in his Nachlass at the Berlin State Library) has a date at the end of it: May 10, 1824.
[1] The scoring, tipping the balance of the strings toward the darker and lower registers, gives the piano a dominating position in most of the piece.
1 in D minor, Op.74 (for piano, flute, oboe, horn, viola, cello and double bass) of 1816, which was issued in a version for piano, violin, viola, cello and double bass[1] (not a unique, but also not a common scoring at that time, the most popular composition for which is Franz Schubert's Trout Quintet of 1819).