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問題一覧
1
Which is the correct molecular formula of the following molecule?
I
2
Which of the ff. compounds has an ionic bond?
NH4Cl
3
How many hydrogen atoms are in one molecule of propene?
6
4
Which is the correct IUPAC name of the ff. compound?
5-bromo-3-ethylhept-3-ene
5
In which species are all the carbon atoms considered to be SP2 hybridized?
C2H4
6
How many different compounds have the formula C5H12?
3
7
Which species is the carbon-nitrogen bond the shortest?
CH3CN
8
What is the hybridization of the carbon atom in a carboxyl group?
sp3
9
which compound is an aldehyde?
III
10
Which of the ff. hydrocarbon has the lowest boiling point?
C4H10
11
Which compound is a tertiary alcohol?
I
12
How many different alcohols have the molecular formula C4H10O?
4
13
Which compound is expected to be most soluble in water at 25 °C?
III
14
The gentle oxidation of ethanol, CH3CH2OH, produces _________.
ethanoic acid, CH3CO2H
15
A reaction in which a carboxylic acid reacts with an alcohol to form an organic compound and water is called ______
esterification
16
Which class of compounds consists exclusively of saturated hydrocarbons?
alkanes
17
What is the position of the bromide atom relative to the methyl group in 3- bromotoluene?
ortho
18
The smell of rancid butter is due to the presence of butyric/butanoic acid. What is the formula of this compound?
C4H8O2
19
Which compound has the highest boiling point?
IV
20
Which of the combination of reactants produces an ester?
acid and alcohol
21
In crystallization, the solution w/c is obtained after filtration is the
clear solution
22
In crystallization, the crystals phases can be inter-convertedby varying _______.
temperature
23
Which separation technique is based on differences in the volatibility of the compounds to be separated?
distillation
24
Fractional distillation is different from distillation because of the presence of a _____
Fractional Column
25
The process of heating a liquid mixture to form vapors and then cooling the vapors to get pure component is called ____
Distillation
26
A common measure of efficiency in fractioning column is the _____
number of theoritical plates in the column
27
Which of the ff.funnels should be used to filter hot mother liquor during recrystallization?
Hirsch funnel
28
What is the key stem in a recrystallization?
Dissolving the solid in a large quantity of cold solvent
29
A constant boiling mixture of two or more components in a solution is called
azeotrope
30
A compound is known to decompose at its boiling point. W/C of the ff. methods can be used to purify this substance?
Steam distillation