1) Which of the following elements forms stable compounds containing long chains

Question

1) Which of the following elements forms stable compounds containing long chains of the covalently bonded atoms?

a) N

b) P

c) Cl

d) C

e) S

2) Which of the following molecules has the longest carbon carbon bond distance?

a) H3CCH3

b) H2CCH2

c) HCCH

d) H2CCO

e) C6H6

3) It is possible to write at least two different structural formulas for each of the following molecular formulas EXCEPT

a) C4H10

b) C3H7Cl

c) C2H2Cl2

d) C2HCl3

e) C3H6

4) What is the molecular formula of a cyclic alkane with 8 carbon atoms?

a) C8H8

b) C8H14

c) C8H16

d) C8H18

e) C8H20

5) Which of the following, upon reacting with oxygen would form the greatest amount of carbon dioxide?

a) n-pentane

b) isopentane

c) neopentane

d) two of these would form equal amounts

e) all of these would form equal amounts

Explanation / Answer

1) Long chain is formed by Carbon

Hence 1- D

2) Longest carbon-carbon distance is presnet in alkanes   H3CCH3

2-A

3) ForC2HCl3 we cant have two isomeric structures

3-D

4) cyclic genral formula CnH2n , hence C8H16

4-C

5) Number of CO2 produced depends on number of carbon atoms in given molecule. n-pentane , isopentane and neopentane all are isomers ( i.e they have same formula). Hence they all will given equal amount of CO2

5-E

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