Question

Convert pen-2-ene to pent-2-yne
Convert but-1-ene to but-2-yne

Answer 1

Explanation:

1) PENT-2-ENE TO PENT-2-YNE

CH3-CH=CH-CH2-CH3+ Br₂ -----> CH3-CH(Br)-CH(Br)-CH2-CH3 + NaNH2(reagent) + heat----> CH3-C ≡ C-CH2-CH3

2) But-1-ene to But-2-ene

CH3-CH2-CH=CH2 +HBr---> CH3-CH2-CH(Br)-CH3

CH3-CH2-CH(Br)-CH3 + KOH (alc)——-> CH3CH=CHCH3 + KBr + H2O  

CH3CH=CHCH3 + NaNH2(reagent) + heat----> CH3C≡CCH3

Hope it helped !!!