Hydrocarbons Test

Result

Hydrocarbons Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

The hydrocarbon which can react with sodium in liquid ammonia is------------?

A
CH₃CH₂C ≡ CH

B
CH₃CH₂CH₂C ≡ CCH₂CH₂CH₃

C
CH₃CH = CHCH₃

D
CH₃CH₂C ≡ CCH₂CH₃

Solution

Terminal alkynes react with Na in the presence of liquid NH3 to form higher alkynes. The alkyne , CH₂CH₂C ≡ CH contains acidic H at the end ( ie.the H bonded to C1 of the chain ) . Therefore , it is easily replaced with highly electropositive metals such as Na in liquid ammonia , to form sodium alkylinide ion which can react furher in presence of suitable catalyst to yield higher alkynes / hydrocarbons .
Question 2
1 / -0

Presence of a nitro group in a benzene ring

A
deactivates the ring towards electrophilic substitution

B
deactivates the ring towards nucleophilic substitution

C
activates the ring towards electrophilic substitution

D
renders the ring basic

Solution

This is because the Nitro is electron withdrawing group,it pulls the electron density from the ring towards itself thereby decreasing the electron density in the ring and deactivating the ring towards attack by the electrophile.
Question 3
1 / -0

Which of the following reactions will yield 2, 2-dibromopropane?

A
CH₃CH ≡ CHBr + HBr →

B
CH₃− CH = CH₂+ HBr →

C
CH ≡ CH + 2HBr →

D
CH₃− C ≡ CH + 2HBr →

Solution

The reaction follows Markovnikoff’s rule of addition which states that in addition of HBr to an unsymmetrical alkene,the major product is the one in which the Br gets attached to the more substituted carbon of the double bond.