GOC
7XWRULDO²11
Hyperconjugation
1.
Hyperconjugation is possible in
(a) alkenes
2.
3.
4.
(c) carbocations
(d) all of these
Hyperconjugation occurs in
(a)
(b)
(c)
(d) all of these
Hyperconjugation occurs in
(a)
(b)
(c)
(d) CH3
Hyperconjugation occurs in
(a)
5.
(b) alkynes
(b)
(c)
(d)
Hyperconjugation occurs in
(a)
(b)
(c)
(d) all of these
6.
How many hyperconjugable H-atoms does this molecule has ?
(a) 0
(b) 2
(c) 3
(d) 5
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7.
How many hyperconjugable H-atoms does this molecule has ?
8.
(a) 0
(b) 6
(c) 10
(I)
(II)
(III)
(d) 15
Among these compounds, which of the following orders is correct for their no-bond-resonance energy ?
(a) I > II > III
9.
(b) III > II > I
(c) I > III > II
(d) II > III > I
Which of the following statements is true about hyperconjugation ?
(a) It is like resonance except that in this case - conjugation occurs but in resonance - conjugation occurs.
(b) Like resonance, hyperconjugation also leads to delocalization of electrons.
(c) both (a) and (b)
10.
(I)
(d) none of these
(II)
(III)
Among these compounds, which of the following orders is correct for their no-bond-resonance energy ?
(a) I > II > III
11.
(b) III > II > I
(c) II > I > III
(II)
(I)
(d) II > III > I
(III)
Among these cations, which of the following orders is correct for their no-bond-resonance energy ?
(a) I > II > III
12.
(b) III > II > I
(d) I > III > II
Indicate the species in which hyperconjugation is absent.
(b)
(a)
13.
(c) II > I > III
(c)
Determine the number of -Hydrogen in each of the following
(i)
(ii)
(iii)
(iv)
(v)
(vi)
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14.
15.
(vii)
(viii)
(ix)
(x) Me3C
(xi) Me2CH
(xii) MeCH2
(xiii) CH3
(xiv)
Show the delocalisation of electron through hyperconjugation indicate possible hyper conjugative structures in each of the
following compounds
(i)
(ii)
(iii)
(iv) (CH3)2CH
(v)
(vi)
Explain why alkyl groups act as electron donors when attached to a  system.
Answer Key
1. (d)
2. (d)
3. (b)
4. (b)
9. (c)
10. (c)
11. (a)
12. (c)
5. (c)
6. (b)
7. (c)
13. (i) 0 (ii) 3 (iii) 6 (iv) 6 (v) 9 (vi) 12 (vii) 0 (viii) 1 (ix) 3 (x) 9 (xi) 6 (xii) 3 (xiii) 0 (xiv) 8
14. (i) 3 (ii) 12 (iii) 3 (iv) 6 (v) 1 (vi) 9
15. Due to hyperconjugation effect of alkyl groups.
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8. (c)