Aldehydes do not form stable hydrates, yet chloral hydrate is readily formed , why ?

Explanation

In chloral, three strong electron withdrawing chlorine atoms are present. As a result, weak nucleophile lik water can easily add. Besides this, intra molecular hydrogen bonding between chlorine and hydrogen atom of -OH group further stabilies the molecule.
`CH_(3)CH_(2)CH_(2)CH_(2)CHO +`
`H-underset(CHO)underset(|)(CH)-CH_(2)-CH_(2)-CH_(3) rarr CH_(3)-CH_(2)-CH_(2)-CH_(2)-underset(OH)underset(|)(CH)- underset(CHO)underset(|)(CH)-CH_(2)-CH_(2)-CH_(3)`