Question

16. To what class of compounds does glucose belong? a cyclic ketone b. cyclic aldehyde ce, cyclic hemiacetald. acid 17. The correct IUPAC name for this compound is 9 ÇH; O CH3-8_ch-che--1 2- 3-methyl-4-diopetanal c- 3-methyl-4-oxopentanol b- 3-methyl-4-oxopentanone d-3-methyl-4-oxopentanal 18. Which is the correct name for CHO b-2-cyclopetynecarbaldhyde d-2-cyclopetanecarbaldhyde a-3-cyclopetanecarbaldhyde c-2-cyclohexynecarbaldhyde 19.The following reaction is o-Grignard alkylation d-Hydration reae a-Aldol condansation b-Fridal craft acylation 20. The product of the following reaction is or -Add + nolaidohyde c-aldhyde d-an acetal a--hemiacetal b-ketones 21-Ketones are easily reduced to. CH3-C-CH3 a-Secondary alcohol b- Primary alcohol c- to acetaldehyde d- to carboxylig

Answer 1

16.

Glucose is a cyclic hemiacetal. It contains a cyclic OR group.

— + Гото но — Он .. о СН2ОН Glucose

17.

Compound has two functional group , aldehyde group has priority over keto group. Numbering starts from aldehyde carbon , keto is named as oxo. Methyl group is present at carbon number 3.

Hence correct name is

3-methyl-4-oxopentanal

63 Сн, С" Н2 – С – 4 С Н 3 — сH, – С – Н 2 1

18.

Aldehyde group has higher priority over double bond.

Hence name is

2-cyclopentenecarbaldehyde.

Пено

19.

The given reaction is fridel-craft acylation.

In acylation reaction electrophile is RCO⁺.

20.

In acetal two OR groups are present.

So the final product is an acetal.

21.

Ketones are reduced to secondary alcohol.

OH eng-chg , esgép-elle