Which carbonyl compound contains a carbon atom with a bond angle of approximately 120∘ 120^\circ\,120∘ and, upon reduction with NaBH4\text{NaBH}_4NaBH4, yields a chiral secondary alcohol?
CH3COCH3\text{CH}_3\text{COCH}_3CH3COCH3
CH3CH2COCH3\text{CH}_3\text{CH}_2\text{COCH}_3CH3CH2COCH3
CH3CH2CH2CHO\text{CH}_3\text{CH}_2\text{CH}_2\text{CHO}CH3CH2CH2CHO
CH3CH2COCH2CH3\text{CH}_3\text{CH}_2\text{COCH}_2\text{CH}_3CH3CH2COCH2CH3