Question

Given the formula for an organic compound:

What is the name given to the group in the box?

(1) butyl
(2) ethyl
(3) methyl
(4) propyl

Answer 1

Answer : The correct option is, (2) ethyl

Explanation :

As per IUPAC rules,

For the number of carbon atom, we add prefix as 'meth' for 1, 'eth' for 2, 'prop' for 3, 'but' for 4, 'pent' for 5, 'hex' for 6, 'sept' for 7, 'oct' for 8, 'nona' for 9 and 'deca' for 10.

A suffix '-ane' is added at the end of the name.

If two of more similar alkyl groups are present, then the words 'di', 'tri' 'tetra' and so on are used to specify the number of times these alkyl groups appear in the chain.

In the given organic formula, the group given the box have 2 carbon chain which named as ethyl.

Hence, the correct option is, (2) ethyl

Answer 2

based on the picture,
The name given to the group in the box would be : Ethyl

You can see that in the picture it has 2 carbon side chains, which mean it categorized as Ethyl

hope this helps