Question

CC(C)C (iii) C#CC(C)C (iii) CCC(C)C (iv) \(\mathrm{C}=\mathrm{C}-\mathrm{C}\) (v) \(\mathrm{C}-\mathrm{C}-\mathrm{C}-\mathrm{C}-\mathrm{C}\)

Short answer

Question: Complete the structures of the given hydrocarbons by placing hydrogens only: (i) C-C=C-C (ii) SMILES: C#CC(C)C (iii) SMILES: CCC(C)C (iv) C=C-C (v) C-C-C-C-C Answer: (i) CH2-CH=CH-CH3 (ii) CH≡CCH2C(CH3)CH3 (iii) CH3CH2CH(CH3)CH3 (iv) CH2=CH-CH3 (v) CH3-CH2-CH2-CH2-CH3

Step-by-step solution

Complete structure for (i)

For the given structure \(\mathrm{C}-\mathrm{C}=\mathrm{C}-\mathrm{C}\), each carbon atom has a valency of 4. Count the existing valency for each carbon atom, and add hydrogens to complete the valency to 4. The completed structure is \(\mathrm{CH_{2}} - \mathrm{CH} = \mathrm{CH} - \mathrm{CH_{3}}\).

Complete structure for (ii)

In the given SMILES notation, C#CC(C)C, the implied bond order between carbons is derived from the SMILES code. The completed structure will be \(\mathrm{CH≡CCH_{2}C(CH_{3})CH_{3}}\)

Complete structure for (iii)

In the given SMILES notation, CCC(C)C, each carbon atom should be adjusted to have valency of 4 by adding hydrogens accordingly to create a complete molecule. The completed structure will be \(\mathrm{CH_{3}CH_{2}CH(CH_{3})CH_{3}}\).

Complete structure for (iv)

For the given structure \(\mathrm{C}=\mathrm{C}-\mathrm{C}\), each carbon atom should have valency of 4. Add hydrogens accordingly, and the completed structure is \(\mathrm{CH_{2}} = \mathrm{CH} - \mathrm{CH_{3}}\).

Complete structure for (v)

For the given structure \(\mathrm{C}-\mathrm{C}-\mathrm{C}-\mathrm{C}-\mathrm{C}\), each carbon atom should have valency of 4. Add hydrogens accordingly to create the complete structure, which is \(\mathrm{CH_{3}} - \mathrm{CH_{2}} - \mathrm{CH_{2}} - \mathrm{CH_{2}} - \mathrm{CH_{3}}\).