Butanal ( An Aldehyde). However, the structural formula in incorrectly given.
It should be 'CH3CH2CH2CHO' NOT ch3ch2ch2coh
NB when giving a chemical formula.
#1 ; All single letter elemental symbols are CAPITAL letters ; C,H,O. not c,h,o.
#2 ; For the given number of 'H' & 'O' atoms present, this substance is an Aldehyde . Structurally Aldehydes are always written as 'R-CHO' , not 'R-COH'.