Where does the first curly arrow start?

• On the electrophile
• On a spectator ion
• On the double bond

Why does an electrophile attack a double bond?

• High electron density draws it in
• Double bonds carry a full positive charge
• Electrophiles attack single bonds first

How does non-polar bromine become able to attack?

• It is already fully charged
• The double bond polarises it
• Bromine splits into ions on its own

Why is a secondary carbocation more stable than a primary one?

• More alkyl groups steady it more
• It carries more hydrogen atoms
• Primary carbons cannot hold any charge

H adds to the end carbon of propene. Which carbocation forms?

• A primary one
• A secondary one
• A tertiary one

The major product of HBr with propene is 1-bromopropane.

A student predicts the primary carbocation route gives the major product because it forms faster. What is the error?

• Stability favours the secondary route
• Carbocations never form in this mechanism
• Both routes give exactly equal amounts

What adds across the double bond with concentrated sulfuric acid, and what follows?

• Two bromines, and nothing follows
• H plus HSO4 add, then hydrolysis
• Water only, giving an alkane