Складіть структурні формули сполук: а) бут-1-ен;
б) бут-2-ин;
в) пент-2-ен;
г) 4-метилпент-2-ин;
д) 2,3,5-триметилгепт-2-ен;
е) 2,3,5-триметилгекс-3-ен;
є) 2,4-дибромо-3,5-диметилгекс-3-ен;
ж) 3-бромо-2,4-диметилпент-2-ен;
з) 3-бромо-4-метилгекс-2-ен;
и) 3-бромо-4-метилпент-2-ен;
і) 3,3-диметилбут-1-ин;
к) 1,3-дибромо-3-метилбут-1-ин;
л) 1,4-дихлоробут-2-ин;
м) 4,4-дибромопент-2-ин.
очень нужно
However, one area of the zoo held a special fascination for me; the reptile house. The variety of their sizes, colours and behaviour were a source of wonder and fantasy for me. Their big, bulging eyes and sleek skin transported me to the age of dinosaurs as I crouched by their cages to get a closer look at them.
Of course, as well as the animals, the zoo was a place for other special treats. The candy floss, the ice creams and fizzy drinks were the end of a perfect day for a curious child.
Now, my opinion about zoos has changed. Although life in the wild presents challenges and dangers for all animals, it has to be preferred to being a prisoner in a cage and a money making tool for greedy owners.
The first group – denudation and deposition – doesn't include the processes which don't act on the crust or at or very near its surface…
2) Such processes are essentially of internal origin. -
Such processes are not essentially of internal origin.
3) The processes of external origin are specifically maintained by the radiation of heat from the sun. -
The processes of external origin are not specifically maintained by the radiation of heat from the sun.
4) Both groups of processes operate under the control of gravitation (including attractions due to the sun and the moon)…. -
Both groups of processes don't operate under the control of gravitation
5) …the processes which act within or through the crust, as a result of the physical and chemical activities of the materials of the substratum (or mantle) and of gases and magmas in the crust or passing through it. -
the processes which don't act within or through the crust, ...