Engineering Questions with Answers - Multiple Choice Questions
Unit Processes MCQ’s – Nitration of Paraffinic Hydrocarbons
1 - Question
The paraffinic are affected by the attack of ?
a) Electrophile
b) Nucleophile
c) Free radical
d) All of the mentioned
View Answer
Explanation: The paraffinic are susceptible i.e. inert to the attack of electro or nucleophile whereas they are affected by certain atoms or free radicals.
2 - Question
The nitration in paraffinic produces ?
a) Mononitroparaffins
b) Dinitroparaffins
c) Trinitroparaffins
d) All of the mentioned
View Answer
Explanation: The nitration process cannot produce any polynitro compounds hence we only get Mononitration paraffin’s.
3 - Question
What do you mean by Optimum temperature?
a) Least temperature at which the reaction starts
b) Average temperature to produce desired product
c) Temperature at which we get maximum yield
d) All of the mentioned
View Answer
Explanation: Optimum temperature is a temperature at which we get maximum yield i.e maximum about of desired product.
4 - Question
How do we increase yield?
a) Getting optimum temperature
b) Decreasing the activation energy
c) Increasing the surface: volume ratio of reactor
d) All of the mentioned
View Answer
Explanation: The above points increases the conversion rate of Nitric acid, hence the yield also increases.
5 - Question
What effect does Bromine has on yield and conversion of nitric acid to nitro paraffins?
a) Positive
b) Negative
c) Inert
d) Does not affect
View Answer
Explanation: Bromine has a beneficial effect on yield and conversion of Nitric acid to Nitroparaffins, similarly Chlorine also effects the yield.
6 - Question
Reaction increases when Carbon chain becomes more branched?
a) True
b) False
View Answer
Explanation: The rate of reaction decreases as carbon becomes more branched as these branches cause hindrance to reactions.
7 - Question
The temperature coefficients for hydrogen substitution are in the order primary > Secondary > Tertiary.
a) True
b) False
View Answer
Explanation: The rate of substitution in the reverse order at low temperature. As the reaction temperature is increased, the rates tend to approach equality.
8 - Question
What is an Alkyl radical?
a) -CH3
b) -C2H5
c) -C3H7
d) All of the mentioned
View Answer
Explanation: Alkyl mean atom or molecule containing a ‘C’ atom, which all the above contains and radical which can easily react with other molecule as it has a vacant spot.
9 - Question
The Liquid phase nitration is of less importance than the gas phase nitration because of ?
a) Low yield
b) Lower conversion
c) Occurrence of unwanted side reactions
d) All of the mentioned
View Answer
Explanation: It is easier for the reaction in gas phase than in liquid phase due to the above reasons.
10 - Question
2RCH2CH2 + NO2 ——–> HNO2 + RCH=CH2 what is the name of this reaction?
a) Paraffin formation
b) Olefin formation
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: Olefin formation has a double bond between two Carbon atoms with the help of nitro group, given in following reaction.