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X(C9H14) one mole gives 1 mole ethanal+2 moles glycerol+ 1 moles propanal Find the no. of stereoisomers possible for compound X

Ethanal has 2 carbons, propanal has 3 carbons and glycerol has 3 carbons (2 moles) therefore there are 11 carbons but the m.f. of X is C9H16 i,e, 9 carbons am I missing something?

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    $\begingroup$ Welcome to ChemSE. What are the conditions for the reaction? Is X C9H14 or C9H16? $\endgroup$
    – user55119
    Mar 16 at 16:33
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    $\begingroup$ You really should explain that "gives". Most compounds just sit there on the shelves and don't give anything, unless you react them with something. $\endgroup$
    – Ivan Neretin
    Mar 16 at 17:08
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    $\begingroup$ X contains no oxygen but all of the products have oxygens. While the aldehydes suggest ozonolysis of an alkene, the appearance of glycerol, a triol, is an issue. $\endgroup$
    – user55119
    Mar 16 at 17:22

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