The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is :
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- 2, 2-dimethyl-4-pentene
- Isopropyl-2-butene
- 4, 4-dimethylpentene
- 2, 2-dimethyl-3-pentene
The Correct Option is A
Solution and Explanation
Joining them gives \(\mathrm{CH_2=CH-CH_2-C(CH_3)_3}\).
The chain \(\mathrm{CH_2=CH-CH_2-C(CH_3)_2-CH_3}\) has 5 carbons with two methyl groups on the carbon next to the chain end; numbered from the double-bond end it is 4,4-dimethyl-1-pentene, and the option names the same compound as 2,2-dimethyl-4-pentene (numbered from the other end).
Option (2) has an isopropyl group, and option (4) puts a tert-butyl group directly on the double bond (no neopentyl or vinyl). Option (3) is an incomplete name (no double bond locant). So option (1) is the intended answer.
Answer: (1) 2, 2-dimethyl-4-pentene
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