Aqueous solution of carbohydrate with 2 drops | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The test described is the $Molisch$ test,which is a sensitive chemical test for the presence of carbohydrates.When an aqueous solution of a carboh

Vedclass · Accepted Answer

Violet

Vedclass · Answer

(C) The test described is the $Molisch$ test,which is a sensitive chemical test for the presence of carbohydrates.When an aqueous solution of a carbohydrate is treated with an alcoholic solution of $\alpha$-naphthol followed by the addition of concentrated $H_{2}SO_{4}$ along the sides of the test tube,a purple or violet-coloured ring is formed at the junction of the two layers.This reaction occurs because the acid dehydrates the carbohydrate to form furfural or its derivatives,which then react with $\alpha$-naphthol to produce the characteristic violet-coloured complex.

Column-$I$	Column-$II$
$P$. Chitin	$I$. $\alpha$-glucose
$Q$. Starch,Glycogen	$II$. $\beta$-glucose
$R$. Cellulose	$III$. $N$-acetyl glucosamine
$S$. Inulin	$IV$. Fructose

$(A)$	$(B)$
$(1)$ Starch	$(a)$ Common sugar used in respiration
$(2)$ Glycogen	$(b)$ Sugar present in the structure of $ATP$
$(3)$ Ribose	$(c)$ Sugar stored in liver and muscles
$(4)$ Glucose	$(d)$ Sugar stored as starch granules

Aqueous solution of carbohydrate with $2$ drops of alcoholic solution of $\alpha$-naphthol and $H_{2}SO_{4}$ gives a ring at the junction. The colour of the ring is:

Similar Questions

In animals,food is stored as $........$.

Which statement is correct for a cellulose molecule?

Which one of the following statements regarding starch and cellulose is not correct?

Match the following columns:

Column-$I$ Column-$II$

$P$. Chitin $I$. $\alpha$-glucose

$Q$. Starch,Glycogen $II$. $\beta$-glucose

$R$. Cellulose $III$. $N$-acetyl glucosamine

$S$. Inulin $IV$. Fructose

Vedclass Test Series

Exam Paper Generator

Online Exam Module