This image is from my book. I am teaching myself OChem, so please bear with my i

Question

This image is from my book. I am teaching myself OChem, so please bear with my ignorance.

1. Does "Khydr" mean "rate of hydration"?

2. If it does mean "rate of hydration," is the below passage saying that the rate of hydration is faster when the groups are small and slower when the groups are large? Please explain to the best of your abilities.

Now let's turn our attention to steric effects by looking at how the size of the groups that were attached to C = 0 affect Khydr. The hood angles at carbon shrink from 120degree to 109.5degree as the hybridization changes from sp2 in the reactant (aldehyde or ketone) to sp3 in the product (hydrate). The increased crowding this produces in the hydrate is better tolerated, and Khydr is greater when the groups are small (hydrogen) than when they are large (alkyl).

Explanation / Answer

1.yes

2.if the groups are huge..steric repulsion to incoming water molecule will be more and hence it will be more difficult for it to reach the attack centre and hence lower Khyd

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