1.

A chloro compound (A) showed the following properties : (i) decolourised bromine in C CI_4, (ii) absorbed hydrogen catalytically , (iii) gave a precipitate with ammoniacal Cu_2CI_2, (iv) when vapourised 1.49g of (A) gave 448mL of vapour at STP. Identify (A) and write down the equation of reaction at step (iii).

Answer» <html><body><p></p>Solution :The (i) and (ii) properties show that the chloro compound (A) is an unsaturated compound having double or triple bond. <br/> The compound <a href="https://interviewquestions.tuteehub.com/tag/gives-1007647" style="font-weight:bold;" target="_blank" title="Click to know more about GIVES">GIVES</a> a precipitate with ammoniacal `Cu_2ci_2`. It is , therefore, an <a href="https://interviewquestions.tuteehub.com/tag/alkyne-853393" style="font-weight:bold;" target="_blank" title="Click to know more about ALKYNE">ALKYNE</a> having acidic hydrogen ,i.e., `-C-=CH`.<br/> Determination of molecular mass: 448mL of the compound <a href="https://interviewquestions.tuteehub.com/tag/weights-1451449" style="font-weight:bold;" target="_blank" title="Click to know more about WEIGHTS">WEIGHTS</a> at `STP=1.49 g` <br/> `22400mL` of the compound will weigh at STP `=(1.49)/(448)xx22400` <br/> Mol. mass `=74.5` <br/> Let the formula of the compound be `RCI=-C-=CH` The formula mass `=R+CI+(-C-=CH)=74.5` <br/> `R+35.5+25=74.5` <br/> `R+60.5=74.5` <br/> So, `R=14` <br/> i.e., `CH_2` <br/> The <a href="https://interviewquestions.tuteehub.com/tag/structure-1230280" style="font-weight:bold;" target="_blank" title="Click to know more about STRUCTURE">STRUCTURE</a> of compound (A) is `overset(CI)overset(|)CH_2-C-=CH`. <a href="https://interviewquestions.tuteehub.com/tag/equation-974081" style="font-weight:bold;" target="_blank" title="Click to know more about EQUATION">EQUATION</a> of step (iii). <br/> `overset(CI)overset(|)(2CH)_2-C-=CH+Cu_2CI_2overset(NH_4OH)tooverset(CI)overset(|)(2CH)_2-C-=C-Cu+2HCI`</body></html>


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