A green coloured chromium compound 'A' on fusion with alkali gives a yellow compound 'B' which on acidification gives an oragne compound 'C' which reacts with NH4Cl to form orange compound 'D' . 'D' on heating gives 'A' back . identify A,B,C,D and give reactions

Q. An orange coloured solid $\left(A\right)$ is soluble in water and gives a gas $\left(B\right)$ and green coloured solid $\left(C\right)$ on heating. The compound $\left(A\right)$ gives a gas $\left(D\right)$ when reacts with $NaOH$ and solution turns yellow. The gas $\left(D\right)$ turns red litmus blue. Identify the compounds $\left(A\right)$ to $\left(D\right)$ and explain the reaction.

Q. An organic compound (A) with molecular formula $C_8{H}_{8}O$ forms an orange-red precipitate with 2,4 DNP and gives a yellow precipitate of compound (B) on treatment with iodine and sodium hydroxide solution. Compound (A) does not give Tollen's or Fehling test but on drastic oxidation with potassium permanganate, it gives (C) which on reaction with thionyl chloride gives a compound (D) having formula $C_7{H}_{5}OCl$. (D) on reaction with compound (E) having general formula $R_{2}Cd$ gives back (A)/ Identify (A), (B), (C), (D) and (E). Also, give chemical equations for the reaction involved.

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Question 53
An element A reacts with water to form a compound B which is used in whitewashing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B and C and give the reactions involved.

Q. An organic compound $A\left(C_6{H}_{6}O\right)$ gives dark green colouration with ferric chloride. On treatment with $CHC{l}_{3}andKOH$, followed by acidification gives compound $B$. Compound $B$ can also be obtained from compound $C$ on reaction with pyridinium chlorochromate $\left(PCC\right)$. Identify $A,BandC$

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Question 53
An element A reacts with water to form a compound B which is used in whitewashing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B and C and give the reactions involved.