My teacher asked me this question. "Compare the reactivities of acetaldehyde and trimethylacetaldehyde towards nucleophilic addition". I explained how trimethylacetaldehyde was sterically hindered and so less reactive towards nucleophilic addition. Later, I realised that acetaldehyde is stabilised by 3 hyperconjugation structures whereas trimethyl acetaldehyde has none. What should I give more weightage to steric effects or electronic effects?