(A) Acetaldehyde does not show aldol co...

(A) Acetaldehyde does not show aldol condensation.
(R) Compounds having atlest one `alpha-` hydrogen give aldol condensation

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In aldol condensation

`alpha`- hydrogen attacks on carbonyl carbon

`alpha-` carbon attacks on carbonyl carbon

`beta-`carbon attacks onn carbonyl carbon

`beta-`hydrogen attacks on carbonyl carbon

self condensation of aldehydes only having altleast one alpha hydrongen

self condensation of ketones only having atleast one alpha hydrogen

self condensation of both aldehydes and ketones havings atleast one alpha hydrogen

self condensation of both aldehydes and ketones having no alpha hydrogen

presence of `beta-` hydrogen

presence of `alpha-`carbon

presence of `alpha-` hydrogen

either ( b) or ( c )