The name for: CH_3-C^S^O-H is a) ethanol b) dimethyl ketone c) dimethyl aldehyde
ID: 534939 • Letter: T
Question
The name for: CH_3-C^S^O-H is a) ethanol b) dimethyl ketone c) dimethyl aldehyde d) ethanal Which of the following statements is true about aldehyde? a) Aldehydes have much lower boiling points than alcohols with a similar molecular weight. b) Aldehydes interact with like molecules through hydrogen bonding c) The carbonyl carbon atom in an aldehyde can never be in position number 1. d) The parent chain of an aldehyde is named by dropping the final "e" from a corresponding alkane and adding "one." To which family of organic compounds does this compound belong? a) ketone b) aldehyde c) acid d) ether Shown here is the structure of acetone, a common laboratory solvent: Another name for acetone is a) dimethyl aldehyde b) propanone c) methyl ethyl aldehyde d) propanal Rank the following compounds in order of increasing boiling point (lowest to highest). a) 2-methyl propane acetoneExplanation / Answer
18. The compound is having functional group aldehyde with 2 carbon atoms. For 2 carbon atom prefix is Eth and suffix al
The compound is Ethanal. Thus option D is correct
19. The boiling point of aldehydes is always lower than the alcohols. Intermolecular hydrogen bonding is possible in alcohols, whereas it is not possible in aldehyde (H is not bonded to electronegative atom like O, N of F). Thus option A is correct and all other options are wrong.
20. R-CO-R, ie if alkyl chain is present on both the side of the functional group, the compound is a ketone. Option a is the correct option.
21. IUPAC name of acetone is propanone. It contains 3 C atoms thus prefix prop came and ketones end with a suffix one. Thus propanone is the correct answer,.Option b
22. Option A is correct. The general trend of boiling point is alkanes, ketones and then alcohols. Intermolecular attractions increase in ketones due to partial charge on the c and O in carbonyl group. Intermolecular hydrogen bonding present in the alcohols has more strength than this electrostatic attraction