Q 21.What is IUPAC Name
IUPAC stand for International Union of Pure and Applied Chemistry
1.IUPAC name of 
is
Butane
2. IUPAC name of is
2,2-dimethyl propanol
3. IUPAC name of
2,2-dimethyl propane
4. IUPAC name of is
2-bromo propane
5. IUPAC name of is
2,2,3,3-tetramethyl butane
6. IUPAC name of is
1,1-dibromo 2,2-dimethyl propane
7. IUPAC name of is
Pentane
8. IUPAC name of is
Propanal
9. IUPAC name of is
Propanone or Propan-2-one
10. IUPAC name of is
Propane
Q.The hybridization of carbon atoms in alkanes is ____
(a) sp
(b) sp2
(c) sp3
(d) sp3d
(e) sp3d2
Option(c) sp3
Q.A molecule with the formula C3H8 is ______
(a) hexane
(b) propane
(c) decane
(d) butane
(e) ethane
(b) propane
Q.Select the correct IUPAC name for:
(a) 5-methyl-5-ethyloctane
(b) 5-methyl-5-propylheptane
(c) 4-ethyl-4-methyloctane
(d) 3-methyl-3-propyloctane
(e) 3-methyl-3-propylheptane
(c) 4-ethyl-4-methyloctane
Explaination:-
Prefix:- 4-ethyl and 4-methyl
word root :- oct +ane
Correct Name = 4-ethyl-4-methyloctane
Q.Select the correct IUPAC name for:
(a) 1,1,3-trimethylpentane
(b) 1-ethyl-1,3-dimethylbutane
(c) 2,4-dimethylhexane
(d) 3,5-dimethylhexane
(e) 3,5,5-trimethylpentane
(c) 2,4-dimethylhexane
Explaination:-
Prefix:- methyl group at 2 and 4 postion
Word root:- Hex + ane
Functional group:- No F.G
Correct name:– 2,4-dimethylhexane
Q.Select the correct IUPAC name for:
(a) 1,4-dimethylcyclopentane
(b) 1,3-dimethylcyclopentane
(c) 2,5-dimethylcyclopentane
(d) 2,3-dimethylcyclopentane
(b) 1,3-dimethylcyclopentane
Explaination:-
Prefix:- Secodary prefix is -methyl and Prymary prefix is- cyclo for ring
Word root:- Pent+ane for five carbon
Functional group:-No F.G
Correct name:– 1,3-dimethylcyclopentane
Q.The general formula for alkenes is:
(a) CnH2n+2
(b) CnH2n
(c) CnH2n-2
(d) CnHn+2
(b) Cn H2n
Explaination:-
Alkene has 2 hydrogen less than alkane( CnHn+2 )
Correct formula of alkene:– CnH2n
Q.The correct name for the compound given below is:
(a) 2-methyl-1-butene
(b) 2-ethyl-1-propene
(c) 2-ethyl-1-pentane
(d) 3-methyl-2-butene
(a) 2-methyl-1-butene
Explaination:-
Prefix:- methyl at position 2
Word root:- But+ ane
Functional group:- No
Correct name:– 2-methyl-1-butene
Q.Select the best name for:
(a) 4-ethyl-cis-3-octene
(b) 4-ethyl-trans-3-octene
(c) 4-butyl-cis-3-hexene
(d) 5-ethyl-trans-5-octene
(b) 4-ethyl-trans-3-octene
Explaination:-
Prefix:- Ethyl at position 4
Word root:- oct + ene for double bond
Functional group:- No F.G but trans isomer
Correct name:– 4-ethyl-trans-3-octene
Q.Name the following compound:–
(a) 6-ethyl-4-methylcyclohexene
(b) 6-ethyl-3-methylcyclohexene
(c) 3-ethyl-5-methylcyclohexene
(d) 6-ethyl-4-methylcyclohex-1-ene
(c) 3-ethyl-5-methylcyclohexene
Explaination:-
Prefix:-ethyl at 3 and methyl at 5 and cyclo for ring
Word root:- hex for six carbon
Functional group:- No
Correct name:– 3-ethyl-5-methylcyclohexene
Q.What is the IUPAC name of the following compound –
(a) 2,6-diethyl-3-nonyne
(b) 2,5-diethyl-3-nonyne
(c) 3,7-dimethyl-5-nonyne
(d) 3,7-dimethyl-4-nonyne
(d) 3,7-dimethyl-4-nonyne
Explaination:-
Prefix:- methyl at position 3 and 7
Word root:- non for nine carbon
Functional group:- triple bond at position 4
Correct name:-
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