{ PersonalID: '12', qusetionNumber: '2', value: 'whatever' },

                { PersonalID: '13', qusetionNumber: '3', value: 'anything' },

                { PersonalID: '14', qusetionNumber: '4', value: 'null' }];

var array2=[{ qusetionNumber: '2', chID: '111', cValue: 'red' },

            { qusetionNumber: '2', chID: '112', cValue: 'green'},

            { qusetionNumber: '2', chID: '113', cValue: 'blue' },

            {qusetionNumber: '3', choiceID: '114', cValue: 'yellow'},

            {qusetionNumber: '4', choiceID: '115', cValue: 'red'}];

​

var i = -1;

array1.forEach(function(a){ 

var arrayWithQuestions = [];

  array2.forEach(function(y){

    if(a.qusetionNumber == y.qusetionNumber){

      i++;

      arrayWithQuestions.push(array2[i]);          

    }

  })

  if(arrayWithQuestions.length!=0){

    a.choice = arrayWithQuestions;

  }  

  console.log(arrayWithQuestions);  

})

console.log('how array1 looks like');

console.log(array1);

var e = document.getElementById('result').innerHTML = JSON.stringify(array1);