Question

A student who stresses too much about his grades has incorrectly named an organic compound 3-propylhexane.What is the correct name?1.) 3-propylhexane2.) 3-ethylhexane3.) 4-ethylhexane4.) 1,1-dipropylpropane5.) None of these6.) propane7.) butene8.) pentane9.) pentene

Answer 1

Answer : The correct option is, (5) None of these.

Explanation :

The basic rules for naming of organic compounds are :

First select the longest possible carbon chain.

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 of alkane.

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 hydrocarbon, the longest possible carbon chain number will be, 7 that means we add prefix 'hept', 'ethyl' group is attached at 4th position and suffix '-ane'. So, the name of given hydrocarbon will be, 4-ethylheptane.

Hence, the correct option is, (5) None of these.