Question

Aldehydes are more reactive than ketones in nucleophilic addition primarily because:

	A.	The C=O group is planar in ketones and not in aldehydes.
	B.	The C=O group is planar in aldehydes and not in ketones.
	C.	Aldehydes are less sterically hindered than ketones.
	D.	Ketones are less sterically hindered than aldehydes.

Answer 1

Both Aldehyde and ketone have group, But in ketone this group is attached with two alkyl group which create more steric hindrance where as in aldehyde, the attached to one alky group and one H-atom which give less steric hinderance and greater polarity.

Hence the option is the correct answer.

That means Aldehyde are less sterically hidered than ketone.