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1) The -=C-H unit of an alkyne is more a...

1) The `-=C-H` unit of an alkyne is more acidic than a C – H unit of an alkene or alkane, allowing acetylene and terminal alkynes to be converted to their conjugate bases `-= C`.
2) Unlike alkenes, alkynes are reduced by metals, especially Li, Na and K.
3) Unlike alkenes, alkynes can undergo nucleophilic as well as electrophilic addition.

Which of the following best describes what happens in the first step in the mechanism of the reaction shown?
`CH_3 CH_2CH_2CHBr_2 + 3NaNH_2 overset(NH_3)to CH_3CH_2C -=CNa +2NaBr +3NH_3`

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
D
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1) The -=C-H unit of an alkyne is more acidic than a C – H unit of an alkene or alkane, allowing acetylene and terminal alkynes to be converted to their conjugate bases -= C . 2) Unlike alkenes, alkynes are reduced by metals, especially Li, Na and K. 3) Unlike alkenes, alkynes can undergo nucleophilic as well as electrophilic addition. Which of the following best describes what happens in the first step in the mechanism of the hydrogen - deuterium exchange reaction shown? CH_3 -= CD underset(NH_3)overset(NaNH_2)to CH_3C -= CH

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