Question

What is the formula of acrolein?
A)$C{{H}_{2}}=CH-CN$
B) $C{{H}_{2}}=CH-CHO$
C) $C{{H}_{2}}=CH-COOH$
D) $C{{H}_{2}}=CH-CON{{H}_{2}}$

Answer 1

Hint: The answer to this question here includes the fact that the total carbon atoms present in the acrolein is that it has the presence of a carbonyl group in it and no nitrogen atom. These facts give you the correct answer.

Complete answer:
From the chapters in earlier classes, we have come across the concepts of naming an organic compound on the basis of IUPAC rule and also about the naming by common name. Let us now understand what is acrolein and this helps us to deduce the correct answer.
- Acrolein is the common name given for a compound which has two carbon atoms which has double bonds present in it and then attached by one functional group which mainly includes the carbonyl group.
- Acrolein is the colourless liquid with a piercing acrid smell. It has pungent odour. Usually the aldehyde and ketone groups have this type of odour.
- Therefore, the compound given on the basis of above data has an aldehyde or ketone group present in it.
Since, in the given options, there is are three carbonyl groups present and the last option is ruled out as it has amide group present and do not belong to aldehyde or ketone group
Option C) has a carboxyl group but the second option has an aldehyde group in it.

Thus, the correct answer is option B) $C{{H}_{2}}=CH-CHO$

Note: To understand the names of the molecules, you have to be thorough with the basic common names possible for a compound and these names are given based on their functional group. For example, formaldehyde is the common name which has an aldehyde group, similarly all its derivatives have a name ending with ‘aldehyde’.