Alkenes and Alkynes 1

Question 1

Dehydrogenation

Answer 1

E1/E2 Zaitsev’s Rule

Question 2

Alcohol Dehydration

Answer 2

primary alcohol:E2
Secondary and Tertiary alcohol:E1
Zaistev’s Rule
heat with acid

Question 3

Alcohol with HX

Answer 3

primary alcohol: protonation, Sn2
tertiary alcohol: protonation, Sn1

Question 4

Hydrogenation of (Z)-alkenes

Answer 4

syn addition
add H2/Ni2B(P-2)

Question 5

Hydrogenation of (E)-alkenes

Answer 5

anti addition
Li or Na / NH3 or RNH2

Question 6

Synthesis alkynes from alkane/alkene

Answer 6

1. dehalogenation of alkane with NH2- and kick out X-
2. deprotonation of alkene and kick out X- with NH2-

Question 7

Terminal alkyne to internal alkyne

Answer 7

1. NaNH2 with NH3(l)
2. (product)CH2Br