Hydrocarbons Test

Result

Hydrocarbons Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Arrange the following hydrogen halides in order of their decreasing reactivity with propene.

A
HCl > HBr > HI

B
HBr > HI > HCl

C
HI > HBr > HCl

D
HCl > HI > HBr

Solution

As we move from Cl to I,the atomic size increases,bond length increases,bond strength decreases,hence it becomes easier to release halogen and hence the order.I^- is the a better leaving group.
Question 2
1 / -0

Arrange the following carbanions in order of their decreasing stability.(A) H₃C – C ≡≡C^– (B) H – C ≡ C^– (C) H₃C−−−CH₂−−

A
B > A > C

B
C > A > B

C
A > B > C

D
C > B > A

Solution

In B,the '-' charge is on sp hybridised C atom so the negative charge is stabilised.In A,there is an alkyl group attached to sp hybridised carbon which destabilises the negative charge. In C,the '-' charge is on a sp³ hybridised carbon and is hence the least stable.
Question 3
1 / -0

Among the following compounds the one that is most reactive towards electrophilic nitration is

A
Benzene

B
Toluene

C
Nitrobenzene

D
Benzoic Acid

Solution

Methyl group is electron donating group, hence it increases the electron density in benzene ring thereby increasing the reactivity of the ring towards electrophilic substitution.
Question 4
1 / -0

Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?

A
Isohexane

B
Neopentane

C
Tertiary butyl chloride

D
Neohexane

Solution

(CH₃)₃CCH₃ + HX(X=Cl,Br,I) ------------> (CH₃)₃CCH₂X

Hence a monosubstituted derivative is formed.
Question 5
1 / -0

Ethyl benzene CANNOT be prepared by ______

A
Clemmensen reduction

B
Wurtz-Fittig reaction

C
Wurtz reaction

D
Friedel-Crafts reaction

Solution

Wurtz reaction is used to prepare alkanes with even number of carbon atoms.To prepare ethylbenzene,Wurtz Fittig reaction has to be used.