#### Term 2 Question paper

11th Standard

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Chemistry

Use Blue pen only
Time : 00:50:00 Hrs
Total Marks : 70

Part-A

10 x 1 = 10
1. In which of the following Compounds does the central atom obey the octet rule?

(a)

XeF4

(b)

AlCl3

(c)

SF6

(d)

SCl2

2. In the molecule O= C = OB, the formal charge on OA, C and OB are respectively.

(a)

-1, 0, +1

(b)

+1, 0, -1

(c)

-2, 0, +2

(d)

0, 0, 0

3. Which of the following is electron deficient?

(a)

PH3

(b)

(CH3)2

(c)

BH3

(d)

NH3

4. Which of the following molecule contain no л bond?

(a)

SO2

(b)

NO2

(c)

CO2

(d)

H2O

5. Of the following molecules, which have shape similar to carbondixide?

(a)

SnCl2

(b)

NO2

(c)

C2H2

(d)

All of these

6. According to VSEPR theory, the repulsion between different parts of electrons obey the order.

(a)

l.p – l.p > b.p–b.p> l.p–b.p

(b)

b.p–b.p> b.p–l.p> l.p–b.p

(c)

l.p–l.p> b.p–l.p > b.p–b.p

(d)

b.p–b.p> l.p–l.p> b.p–l.p

7. Shape of ClF3 is

(a)

Planar triangular

(b)

Pyramidal

(c)

'T' Shaped

(d)

none of these

8. Non- Zero dipole moment is shown by

(a)

CO2

(b)

p-dichlorobenzene

(c)

carbontetrachloride

(d)

water

9. In the hydrocarbo $\overset { 7 }{ { CH }_{ 3 } } -\overset { 6 }{ { CH }_{ 2 } } -\overset { 5 }{ CH } =\overset { 4 }{ CH } -\overset { 3 }{ { CH }_{ 2 } } -\overset { 2 }{ CH } =\overset { 1 }{ CH }$ the state of hybridisation of carbon 1,2,3,4 and 7 are in the following sequence.

(a)

sp, sp, sp3, sp2, sp3

(b)

sp2, sp, sp3, sp2, sp3

(c)

sp, sp, sp2, sp, sp3

(d)

none of these

10. The general formula for alkadiene is

(a)

CnH2n

(b)

CnH2n-1

(c)

CnH2n-2

(d)

CnHn-2

11. Part-B

10 x 2 = 20
12. Discuss the formation of N2 molecule using MO Theory

13. What is dipole moment?

14. Linear form of carbondioxide molecule has two polar bonds. yet the molecule has Zero dipolement why?

15. Draw the Lewis structures for the following species.
i) NO3
ii) SO42–
iii) HNO3
iv) O3

16. Give the general formula for the following classes of organic compounds
(a) Aliphatic monohydric alcohol
(b) Aliphatic ketones.
(c) Aliphatic amines.

17. Write the molecular formula of the first six members of homologous series of nitro alkanes.

18. What are electrophiles and nucleophiles? Give suitable examples for each.

19. Show the heterolysis of covalent bond by using curved arrow notation and complete the following equations.
Identify the nucleophile is each case.
(i) CH3 - Br + KOH →
(ii) CH3 - OCH3 + HI →

20. Explain inductive effect with suitable example.

21. Write the structures of folowing alkanes.
1) 2, 3 – Dimethyl – 6 – (2 – methyl propyl) decane
2) 5 – (2 – Ethyl butyl) – 3, 3 – dimethyldecane
3) 5 – (1, 2 – Dimethyl propyl) – 2 – methylnonane.

22. Part-C

5 x 3 = 15
23. 0.40 g of an iodo-substituted organic compound gave 0.235 g of AgI by carius method. Calculate the percentage of iodine in the compound. (Ag = 108, I = 127) (Ans = 31.75)

24. 0.24 g of organic compound containing phosphorous gave 0.66 g of Mg2P2O7 by the usual analysis. Calculate the percentage of phosphorous in the compound.

25. 0.33 g of an organic compound containing phosphorous gave 0.397 g of Mg2P2O7 by the analysis. Calculate the percentage of P in the compound.

26. A hydrocarbon C3H6 (A) reacts with HBr to form compound (B). Compound (B) reacts with aqueous potassium hydroxide to give (C) of molecular formula C3H6O.what are (A) (B) and (C). Explain the reactions.

27. Two isomers (A) and (B) have the same molecular formula C2H4Cl2. Compound (A) reacts with aqueous KOH gives compound (C) of molecular formula C2H4O. Compound (B) reacts with aqueous KOH gives compound(D) of molecular formula C2H6O2. Identify (A), (B), (C) and (D).

28. Part-D

5 x 5 = 25
29. 0.185 g of an organic compound when treated with Conc. HNO3 and silver nitrate gave 0.320 g of silver bromide. Calculate the % of bromine in the compound. (Ag =108, Br = 80) Ans: 73.6

30. Give the IUPAC names of the following compounds.
(i) (CH3)2CH – CH2 – CH(CH3) – CH(CH3)2
(ii) ${ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -\underset { \overset { | }{ Br } }{ CH } -{ CH }_{ 3 }$
(iii) CH3 - O - CH3
(iv) ${ CH }_{ 2 }-{ CH }_{ 2 }-\underset { \overset { | }{ OH } }{ CH } -CHO$
(v) CH2 = CH - CH = CH2
(vi) ${ CH }_{ 3 }-C\equiv C-\underset { \overset { | }{ Cl } }{ CH } -{ CH }_{ 3 }$
(vii)
(viii)
(ix)
(x)
(xi)
(xii)
(xiii)
(xiv)
(xv)

31. Give the structure for the following compound.
(i) 3- ethyl - 2 methyl -1-pentene
(ii) 1,3,5- Trimethyl cyclohex - 1 -ene
(iii) tertiary butyl iodide
(iv) 3 - Chlorobutanal
(v) 3 - Chlorobutanol
(vi) 2 - Chloro - 2- methyl propane
(vii) 2,2-dimethyl-1-chloropropane
(viii) 3 - methylbut -1- ene
(ix) Butan - 2, 2 - diol
(x) Octane - 1,3- diene
(xi) 1,5- Dimethylcyclohexane
(xii) 2-Chlorobut - 3 - ene
(xiii) 2 - methylbutan - 3 - ol
(xiv) acetaldehyde.

32. Give IUPAC names for the following compounds
1) CH3 – CH = CH – CH = CH – C ≡ C – CH3
2)
3) (CH3)3 C – C ≡ C – CH (CH3)2
4) ethyl isopropyl acetylene
5) CH ≡ C – C ≡ C – C ≡ CH

33. Identify the compound A, B, C and D in the following series of reactions

Write short notes on ortho, para directors in aromatic electrophilic substitution reactions.