(D) The given compound is $CH_{3}-CH_{2}-CHO$.This compound contains a chain of $3$ carbon atoms.The functional group present is the aldehyde group $(

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(D) The given compound is $CH_{3}-CH_{2}-CHO$.This compound contains a chain of $3$ carbon atoms.The functional group present is the aldehyde group $(-CHO)$.For a $3$-carbon chain,the prefix is 'prop-'.Since it is an aldehyde,the suffix '-al' is added to the alkane name.Therefore,the $IUPAC$ name is Propanal.