H-C≡ C-CH_3 \xrightarrow{HBr(excess)} A \xrightarrow[△]{H_2O}B Compound B is (1) A diol (2) An aldehyde (3) A ketone (4) An alkyl halide

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Three organic compounds A, B and C have the following molecular formulae :
A $C_{4} H_{8} O_{2}$
B $C_{4} H_{10} O$
C $C_{4} H_{8} O$
(a) Which compound contains an alcohol group? Write its name and structural formula.
(b) Which compound contains a carboxyl group? Write its name and structural formula.
(c) Which molecular formula can represent an aldehyde as well as a ketone? Write the names and structural formulae of the aldehyde and ketone represented by this molecular formula.

Q. An organic compound is a clear liquid having a molecular formula

C_{4} H_{8} O

. It has an open-chain structure. Without any carbon-carbon double bond. The compound can be:

a) An alcohol
b) An ester
c) An aldehyde
d) A ketone

Q. An ether

A

(C_{5} H_{12} O)

when heated with excess of hot concentrated

H I

produced two alkyl halides which on hydrolysis from compounds

B

and

C

. Oxidation of

B

gives an acid

D

whereas oxidation of

C

gave a ketone

E

. Deduce the structures of

A, B, C, D

and

E

Q. Question 2
Butanone is a four-carbon compound with the functional group:
(a) Carboxylic acid
(b) Aldehyde
(c) Ketone
(d) Alcohol

The molecular formulae of some organic compounds are given below. Which of these compounds contains an aldehyde group ?
(a) $C_{3} H_{8} O$ (b) $C_{3} H_{6} O_{2}$ (c) $C_{3} H_{6} O$ (d) $C_{3} H_{7} C l$

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