organic chemistry
The first question: Choose the correct answer):30marks(
(1) Ethylene has ..................hypridization.
a)sp .
b)sp2 .
c)sp3 .
. d)sp4
2-The unit of dipole moment is…….
a) volt.
b) neotin.
c) hertiz.
d) non of the above.
3-Alkynes have the general formula …….
a)CnH2n+2 .
b)CnH2n-2.
c)CnH2n.
d)non of the above.
4-Saturated hydrocarbons such as …….
a) alkanes.
b)alkenes.
c)alkynes.
d)non of the above.
5-Alkynes have ………….bond
a)single.
b)double.
c)triple.
d)non of the above
6-Enantiomeres known as the (+) form rotate the plane of polarization in a ……….direction
a)clockwise.
b)anticlockwise.
c) a &b.
d)non of the above.
7)The simplest cycloalkanes have the general formula
a)CnH2n+2.
b)CnH2n-2.
c)CnH2n.
d)non of the above.
8-isomerism in organic compound such as ………………..isomerism
a)Chain.
b)position.
c)geometrical.
d)all of the above.
9-The Greek prefixes used as tri for
a)one.
b)tow.
c)three.
d)four.
10-CH3CH=CHCH2CH2CH3 named
a)2-hexen.
b)2-hexan.
c)2-hexyne.
d)none of the above.
11-The boiling point of alkenes …………………with the molecular weight
a)decrease.
b)increase.
c)constant.
d)non of the above.
12-Hydrogen halides such as
a)HI .
b)Hcl .
c)HBr.
d)all of the above.
13-Mercuric ion catalyzed ...............of alkynes
a)halgenation.
b)hydration.
c)danitration.
d)non of the above.
14-Benzene is a flat …………..member ring
a)one.
b)three.
c)four.
d)six
15- Aromaticity characters highly ………………..
a)saturated.
b)unsaturated.
c) a and b.
d) none of the above
16-Friedel-Crafts alkylation involves alkylation of an …………..ring
a)aromatic.
b)aliphatic.
c)a&b.
d)none of the above.
17-Nitrationiis carried out by …..
a) nitric acid.
b)chlorine.
c)sulphuric acid.
d)non of the above.
18-Alkyle halides are classified as
a)primary.
b)secondary.
c)tertiary.
d)all of the above.
19-Alkyle halides are……. polar than hydrocarbons families
a)less.
b)more.
c)equal.
d)none of the above
20-Functional group of alcohol is
a)-OH.
b)-COOH.
c)-CHO.
d)on of the above.
21-CH3 OH is.........
a)methyl alcohol.
b)methanol.
c)a&b
d)Non of the above.
22-………….are compound of formula ROR
a)ethers.
b)phenols.
c)alcohols.
d)none of the above.
23- Aldehydes could be oxidized into …….
a)alkanes
b)alkenes
c)alkynes
d)carboxylic acid
24 Aldehydes and ketones are easily reduced to yield
a)alcohols.
b)acids.
c)amines.
d)ethers.
25-Amines have the functional group…….
a)-OH.
b)-COOH.
c)-CHO.
d)NH2.
26-Acetic acid reacts with phosphorous chloride producing……
a) acyl chloride
b)benzene
c)alcohols
d)none of the above
27-When acids chloride react with ammonia give
a)amides
b)amines.
c)acids.
d)aldehydes.
28-Acid chlorides react with alcohol to yield
a)esters .
b)acids.
c)amines.
d)none of the above.
29-The boiling point of carboxylic acids are
a)high.
b)low.
c)a&b.
d)none of the above.
30-Complete combustion of alkanes produces…..
a)CO2+ H2O
b) CO+H2O
c) CO+CO2
d) None of the above
Second Question : Complete the following sentences:
(10 marks)
1) Overlap side to side gives …………………..bond.
2)…………. is summation of all individual bond prosperities, formal charges and lone pair contribution.
3) Electronegativity .… across the vertical column
4)alkynes have carbon-carbon………………….bond.
5) Propene reacts with H2SO4 producing…..…
6) …………..are compound containing -CHO group.
7) 3C2H2 condenses in presence of catalyst giving …….…………
8)Melting points of amines …………..with molecular weight.
9) Cholorobenzene results from reaction of benzene with …….
10)Ester hydrolysis in basic solution is called ………………….
THIRD QUESTION : Put (T) for true sentence and (F) for false one.
(10 marks)
1) Mass number is number of protons plus neutrons( ).
2) Ionic bond formed by the attractive force between ions. ( )
3) Alkanes are saturated hydrocarbons. ( )
4) Racamate mixture contain 50\50 mixture of two enantiomers. ( )
5) Ergotamine used for treatment of cough. ( )
6) Ethylene glycol used as antifreeze. ( )
7) CH3COCL reacts with ethanol giving ethyl ester acetate. ( )
8) Organomagnesium halide (RMgX) known as Girignard reagent. ( )
9) DDT has pesticide effect. ( )
10) The alkyl halides are soluble in water . ( )
Fourth Question: define all of the following: ( 5 marks )
1) Atomic number.
2) Atomic orbital.