Question

multiple choice 2 points
how many moles of bh₃ need to be added to completely react with 1 mole of hex - 1 - ene?
1 mole of bh₃
3 mole of bh₃
1/2 mole of bh₃
1/3 mole of bh₃

Explanation:

Step1: Recall Hydroboration Reaction

In hydroboration of alkenes, \( BH_3 \) (borane) reacts with alkenes. The formula for borane is \( BH_3 \), and it has three hydrogen atoms available for reaction with alkene double - bonds.

Step2: Determine Mole Ratio

For 1 mole of hex - 1 - ene (an alkene with one double bond), since \( BH_3 \) has three reactive sites (three \( B - H \) bonds), the mole ratio of \( BH_3 \) to hex - 1 - ene is \( 1:3 \). So, for 1 mole of hex - 1 - ene, the moles of \( BH_3 \) required is \( \frac{1}{3} \) mole.

Answer:

1/3 mole of \( BH_3 \)