The ketone shown is reduced with $NaBH X_{4}$ , the alcohol is dehydrated with hot conc. $H X_{2} SO X_{4}$ (Saytzeff product, ignore E/Z), and the alkene is subjected to reductive ozonolysis. How many different organic compounds are formed in the last step?

A $1$
B $2$
C $3$
D $4$

Answer: A

Butan-2-one is reduced to butan-2-ol, which dehydrates to the more substituted alkene, but-2-ene. Its reductive ozonolysis gives two molecules of the same product, ethanal, so only 1 compound. (But-1-ene, the minor alkene, would give two.)

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The ketone shown is reduced with NaBHX4​, the alcohol is dehydrated with hot conc. HX2​SOX4​ (Saytzeff product, ignore E/Z), and the alkene is subjected to reductive ozonolysis. How many different organic compounds are formed in the last step?

Answer: A

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The ketone shown is reduced with $NaBH X_{4}$ , the alcohol is dehydrated with hot conc. $H X_{2} SO X_{4}$ (Saytzeff product, ignore E/Z), and the alkene is subjected to reductive ozonolysis. How many different organic compounds are formed in the last step?