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Practice each question, then open the answer or worked solution.
Which of the following compounds contains all the carbon atoms in the same
hybridisation state?
(i) H—C ≡ C—C ≡ C—H
(ii) CH3—C ≡ C—CH3
(iii) CH2 = C = CH2
(iv) CH2 = CH—CH = CH2
Option (i) and (iv) are the answers.
In which of the following representations given below spatial arrangement of
group/ atom different from that given in structure ‘A’?
Option (i), (iii) and (iv) are the answers.
Electrophiles are electron-seeking species. Which of the following groups contain only electrophiles?
(i) BF3, NH3, H2O
(ii) AlCl3, SO3 , + NO2
(iii) NO2+ , CH3+ , CH3 –C+ = O
(iv) C2H-5, C2H5, CH5+
Option (ii) and (iii) are the answers.
Note: Consider the following four compounds for answering question 19
and 20.
Which of the following pairs are position isomers?
(i) I and II
(ii) II and III
(iii) II and IV
(iv) III and IV
Option (ii) is the answer.
Which of the following pairs are not functional group isomers?
(i) II and III
(ii) II and IV
(iii) I and IV
(iv) I and II
Option (i) and (iii) are the answers.
A nucleophile is a species that should have
(i) a pair of electrons to donate
(ii) positive charge
(iii) negative charge
(iv) electron-deficient speciesSolution:
Option (i) and (iii) are the answers.
Solution coming soon.
Hyperconjugation involves the delocalisation of ___________.
(i) electrons of the carbon-hydrogen σ bond of an alkyl group directly attached
to an atom of the unsaturated system.
(ii) electrons of carbon-hydrogen σ bond of alkyl group directly attached to
the positively charged carbon atom.
(iii) π-electrons of carbon-carbon bond
(iv) lone pair of electrons
Option (i) and (ii) are the answers.
III. Short Answer Type
Note: Consider structures I to VII and answer questions 23–26.
Which of the above compounds form pairs of metamers?
V and VI form pairs of metamers. (metamers of ethers). Here in compounds V and VI, the chain length is the same, but the distribution of carbons is different around oxygen atom.
Identify the pairs of compounds which are functional group isomers.
I and V, I and VI, I and VII, II and V, II and VI, II and VII, III and V, III and VI, III and VII, IV and V, IV and VI, IV and VII. Alcholol is the function group of each ether in the given seven compounds.
Identify the pairs of compounds that represent position isomerism.
I and II, III and IV, V and VI are the compounds which represent the position isomerism.
Position isomerism means where the length of the parent chain and functional group is the same, but the position of the functional group is different; then it is called position isomer.