Organic Chemistry Which of the folowing molecules shows the highest cH stretchin

Question

Organic Chemistry

Which of the folowing molecules shows the highest cH stretching frequency? (d hept-2-en-4-yne (cl hex-1-yne lbl 2-methyl butane a) pent-2-ene I which of the molecules has a cro stretching frequency with 16a2 cm i? (b) CH CHCH b) CHsCONHCHh The R absorption at 163 cm belongs to The "m/u value" and the relative abundance" for M-2 peak in ICHilot-Br? (cl 124 and 75% (d 122 and 50% b) 124 and 50% (a) 122 and 25% s) which one of the compounds shows an absence of M' peak 7 6l the molecule otoHuCHIBrla, the 'H NMR sienalfor "CH" would show (d) 7.2 ppm (triplet) (c S2 ppm (triplet (b) 13 ppm triplet (a 34 ppm (triplet In the molecule below, circle the group that showsadownfield chemical shift lhighest) in both LH and wc NMR in the moleculea, CHzc N, uc NMR shifted at to show the main functional group Initrilel. (kl 1228 (bl 535 al 868 9) which one of the molecules would generate the folowing HNMR spectrum?

Explanation / Answer

1.

Alkynyl C-H Stretch ~3300 (s)

Answer is (c) hex-1-yne

2.

Amide C=O Stretch   1690 - 1630 cm-1

Answer is (b) CH3CONHCH3

3.

Alkenyl C=C Stretch 1680 - 1620 cm-1

Answer is (b)

4.

Natural bromine consists of a nearly 50:50 mixture of isotopes having atomic masses of 79 and 81 amu respectively.

Hence answer is (d).

5.

Absence of molecular ion peak in the mass spectrum means that the compound under examination is highly branched or tertiary alcohols. Primary and secondary alcohols give very small molecular ion peak.

Answer is (d)

6.

Answer is (c) 5.2 ppm (triplet)

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