The utility of A-values can be generalized for use outside of cyclohexane conformations. A-values can help predict the steric effect of a substituent. In general, the larger a substituentâs A-value, the larger the steric effect of that substituent. Methyl has an A-value of 1.74 while tert-butyl has an A-value of ~5. Because the A-value of tert-butyl is higher, tert-butyl has a larger steric effect than methyl. This difference in steric effects can be used to help predict reactivity in chemical reactions.
Turner Beach in Antigua. Antigua (/Ã¦nËtiËÉ¡É/ an-TEE-ga), also known as Waladli or Wadadli by the native population, is an island in the West Indies. It is one of the Leeward Islands in the Caribbean region and the main island of the country of Antigua and Barbuda. Antigua and Barbuda became an independent state within the Commonwealth of Nations on 1 November 1981.
This territory consists of several islands, the largest being Antigua (281 square kilometers, or 108 square miles), Barbuda (161 square kilometers, or 62 square miles), and Redonda (1.6 square kilometers, or 0.5 square miles). The smaller islands include Guiana Island, Bird Island, and Long Island. The combined area of this multi-island state is 442 square kilometers (171 square miles) making the territory about 2 and a half times the size of Washington, D.C. Antigua's coastline measures 153 kilometers (95 miles). The country's capital, St. John's, is located on the northwestern coast of Antigua. The main towns include Parham and Liberta on Antigua, and Codrington on Barbuda.