A dozen eggs

Can I have a dozen eggs/muffins/screws?
Can I have a dozen of those things / of the other kind?

So, what do you mean? What is the conclusion?

No conclusion. Use dozen as I have shown you in those examples.

So meaning, A dozen of roses is wrong? I don't think so.

What makes it different from eggs/muffins/screws?

Dozen is merely an adjective here. A dozen of roses sounds wrong to my AmE ears; maybe speakers from other English-speaking countries will accept it.

Mister MicawberDozen is merely an adjective here. A dozen of roses sounds wrong to my AmE ears; maybe speakers from other English-speaking countries will accept it.

Hi Mister Micawber,

I wonder if it is the same to use 'would' instead of 'will' in your sentence.

Thank you.

Best wishes,

PBF

That means :

(a) A dozen of eggs. ( Why can't we use as like other collective nouns?)

In my opinion, you can only say "a dozen of " when the things you are talking about are specified (i.e. when the things are preceded by words such as the, this, that, these, those).

I'd like a dozen of these eggs.
I'd like a dozen of the green lollipops and a dozen of the red ones.

[Why can't we use as like other collective nouns?]
Dozen is not normally a counter; it is a quantity. A dozen roses, a hundred roses. We don't say a three of roses-- though we do say a score of roses (but two score roses) and a gross of roses-- so these various expressions may have an idiomatic factor.

I've had a look through CGEL, but canno

Peaceblinkfriend

Mister MicawberDozen is merely an adjective here. A dozen of roses sounds wrong to my AmE ears; maybe speakers from other English-speaking countries will accept it.

Hi Mister Micawber,
I wonder if it is the same to use 'would' instead of 'will' in your sentence.PBF

No, 'will'