Question
Explain the addition of hydrogen halides to alkynes using a general reaction.
✓
Answer
i. Hydrogen halides (HCl, HBr and HI) add to alkynes across carbon-carbon triple bond in two steps to form geminal dihalides (in which two halogen atoms are attached to the same carbon atom).
ii. The addition of HX in both the steps takes place according to Markovnikov’s rule as shown in below.
General reaction:
iii. The order of reactivity of hydrogen halides is HI > HBr > HCl.
ii. The addition of HX in both the steps takes place according to Markovnikov’s rule as shown in below.
General reaction:
iii. The order of reactivity of hydrogen halides is HI > HBr > HCl.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Show that the equilibrium constant of the reverse chemical reaction $(K_C)$ is the reciprocal of the equilibrium constant $(K_C).$
→What is air?
Give reason: Aqueous solution of sodium carbonate is alkaline in nature.
How is strength of $H2O2$ solution expressed?
→Perform following calculations and express results in scientific notations $($exponential notations$).$
$i. \ (2.5 \times 10^{-6}) \times (1.8 \times 10^{-7})$
$ii. \ (4.5 \times 10^{-3}) \times (1.8 \times 10^3)$
$iii. \ (8.5 \times 10^7) \times (3.5 \times 10^9)$
→$i. \ (2.5 \times 10^{-6}) \times (1.8 \times 10^{-7})$
$ii. \ (4.5 \times 10^{-3}) \times (1.8 \times 10^3)$
$iii. \ (8.5 \times 10^7) \times (3.5 \times 10^9)$
Explain the term nucleophile. Give examples.
Perform following calculations and express results in scientific notations $($exponential notations$),$
$i. \ (1.5 \times 10^{-6}) – (5.8 \times 10^{-7})$
$ii. \ (9.8 \times 10^{-3}) – (8.8 \times 10^{-3})$
$iii. \ (6.5 \times 10^{-8}) – (5.5 \times 10^{-9})$
→$i. \ (1.5 \times 10^{-6}) – (5.8 \times 10^{-7})$
$ii. \ (9.8 \times 10^{-3}) – (8.8 \times 10^{-3})$
$iii. \ (6.5 \times 10^{-8}) – (5.5 \times 10^{-9})$
Give reason: Purification of a chemical substance is important before investigating its composition and properties.
Identify dispersed phase and dispersion medium in the following colloidal dispersions.
a. milk
b. blood
c. printing ink
d. fog
a. milk
b. blood
c. printing ink
d. fog
What does the term omega represent in unsaturated fatty acids? Explain with the help of an example.