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

Explanation

In chloral , three strong electron withdrawing chlorine atoms are present. Asa result , weak nucleophile like water can easily add. Besides this, intra molecular hydrogen bonding between chlorine and hydrogen atom of - OH group further stabilises the molecule.
`CH_3CH_2CH_2CH_2CHO+ `
`H -underset(CHO)underset(|)(CH)-CH_2-CH_2-CH_3rarr`
`CH_3-CH_2-CH_2-CH_2-underset(OH)underset(|)(CH)-underset(CHO)underset(|)(CH)-CH_2-CH_2-CH_3`