priority order of chiral compound

[MikeMitchell]

A chiral carbon has substituents of h3c, oh, br, and cho (attached at c). What priority is cho?

This is an examkrackers question with answer of 2. Shouldn't it be priority three? I strongly distrust this 1001 questions book. Lots of typos.

Thanks!

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[MShopes]

A chiral carbon has substituents of h3c, oh, br, and cho (attached at c). What priority is cho?

This is an examkrackers question with answer of 2. Shouldn't it be priority three? I strongly distrust this 1001 questions book. Lots of typos.

Thanks!

You are right! It should be third in priority. The trend goes like that from the first to last: Br>OH>CHO>H3C.

The CHO can't be 2nd priority because OH starts with O which is better than C in CHO. And of course Br is superior to all of them because it has the highest atomic number.