organic chemistry multiple choice questions please help. is 15 correct and need

Question

organic chemistry multiple choice questions please help. is 15 correct and need help with 16-20. thank you!

Circle the compound that cannot be reduced by Lithium aluminum hydride. Rank the following compound in order of increasing equilibrium constant for there are four different types of hydrogen in the following molecule. Circle the most acidic hydrogen. Circle the structure of Ethyl How many hydrogens are present in the following molecule? Which one of the compounds should have the highest boiling point? Circle the compound that cannot be reduced by Lithium aluminum hydride Rank the following compound in order of increasing equilibrium constant for hydration, 1 being the most reactive. There are four different types of hydrogen in the following molecule. Circle the most acidic hydrogen. Circle the structure of Ethyl acetoacetate How many vinylic hydrogens are present in the following molecule? Which one the compound should have the highest boiling point?

Explanation / Answer

15) the answer is correct because LiAlH4 can reduce carboxylic acis and carbonyl compounds to their corresponding alcohols.The circled compound is an alcohol which therefore cannot be oxidized by LiAlH4

16) Ka of HCHO = most acidic (1)

Ka of CH3CHO = less acidic (3)

Ka of CH3COCH3 = least acidic (4)

Ka of CH2ClCHO = acidic (2)

17) CH3-CH2-(C=O)-CH2-COOH

The most acidic H-atom is the one attached with the -COOH group

19) Vinylic H-atoms are those which are bonded to the doubly bonded( or, sp2 hybridized) C-atom in a structure.Thus, the total number of vinylic H-atoms are (a) 4

20) The B.P is governed by the following factors.

a) more will be the B.P of the substance , if it can for intermolecular H-bonds.

b) greater the mass of the substance, more will be the B.P

c) For compounds with same mass, the one with larger surface area will have greater B.P

Thus, The greatest B.P should be of (d) CH3COOH

18) Ethyl acetoacetate is CH3-(C=O)-CH2-(C=O)-O-CH2CH3

Thus, the correct structure of ethyl acetoacetate is the middle one

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