`(1)` $CH_3CH_2CH(CH_3)CHO$ `+` $LiAlH_4$ `to` $CH_3CH_2CH(CH_3)CH_2OH$

`(2)` $CH_3CH_2COCH(CH_3)_2$ `+` $NaBH_4$ `to` $CH_3CH_2CH(OH)CH(CH_3)_2$

`(3)` $CH_2=CHCH_2CHO$ `+` $NaBH_4$ `to` $CH_3CH(OH)CH_2CH_3$

`(4)` $CH_2=CHCH_2CHO$ `+` $H_2$ $\xrightarrow{Ni, t^o}$ $CH_3Ch(OH)CH_2CH_3$

`(5)` $HCOCHO$ `+` $NaBH_4$ `to` $HOCH_2CHO$

`(6)` $OHC-CH=CH-CHO$ `+` $LiAlH_4$ `to` $HOCH_2CH=CHCH_2OH$ 

`\color{#1AD5F7}{⋆⟡}\color{#1AD5F7}{C}\color{#4DA6E6}{h}\color{#668EDD}{i}\color{#8077D5}{p}\color{#995FCD}{p}\color{#EA2F90}{⟡⋆}`