Fill in the blank by choosing the appropriate word/words from those given in the brackets.
(acetaldehyde, formaldehyde, benzaldehyde, yellow, white, violet, Cannizzaro's, Liebermann, no `alpha`-hydrogen atom, `1alpha`-hydrogen atom, `2alpha`-hydrogen atoms, aldol, `beta`-hydroxy aldehyde, aldol condensation, mixed condensation, + I,-I, -M,+ M. decreases, increases, benzalchloride, PCI, SOCh. sec, alcohol, tert, alcohol, phenylhydrozone, semicarbazone, more, less, acetals, ketals, silver mirror, test, urotropine, acetaldehyde cyanohydrin, lactic acid, benzoic acid, Sodalime, ethanoic acid, propanoic acid, electrolysis, Kolbe's electrolytic reaction, carbon dioxide, water, amides, alpha, halogen, phosphorus, weaker, stronger, ethyl alcohol, dibasic,monobasic, 2,2-dimethylpropanoic acid, `CH_(3)COCI`, acetic acid, `CH_(3)CH_(2)CH_(2)COOK`, enatiomers, diastereo, `K_(a)` `pk_(a)`, methanoic acid, higher, lower.)
For the addition reactions with HCN, `NaHSO_(3)`, aldehydes are....reactive than ketones.

Explanation

To solve the question, we need to fill in the blank with the appropriate word from the options provided. The statement to complete is:

"For the addition reactions with HCN, NaHSO3, aldehydes are ______ reactive than ketones."

### Step-by-Step Solution:

1. **Understanding Reactivity of Aldehydes and Ketones**:
- Aldehydes and ketones both contain a carbonyl group (C=O), but their reactivity can differ based on the substituents attached to the carbonyl carbon.
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